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| 1 | Effect of turbulence models on predicting convective heat transfer to hydrocarbon fuel at supercritical pressure显示文摘A variety of turbulence models were used to perform numerical simulations of heat transfer for hydrocarbon fuel flowing upward and downward through uniformly heated vertical pipes at supercritical pressure. Inlet temperatures varied from 373 K to 663 K, with heat flux ranging from 300 k W/m^2 to 550 k W/m^2. Comparative analyses between predicted and experimental results were used to evaluate the ability of turbulence models to respond to variable thermophysical properties of hydrocarbon fuel at supercritical pressure. It was found that the prediction performance of turbulence models is mainly determined by the damping function, which enables them to respond differently to local flow conditions. Although prediction accuracy for experimental results varied from condition to condition, the shear stress transport(SST) and launder and sharma models performed better than all other models used in the study. For very small buoyancy-influenced runs, the thermal-induced acceleration due to variations in density lead to the impairment of heat transfer occurring in the vicinity of pseudo-critical points, and heat transfer was enhanced at higher temperatures through the combined action of four thermophysical properties: density, viscosity, thermal conductivity and specific heat. For very large buoyancyinfluenced runs, the thermal-induced acceleration effect was over predicted by the LS and AB models. | Tao Zhi Cheng Zeyuan Zhu Jianqin Li Haiwang | 2016 | Chinese Journal of Aeronautics2016，29，5： | 8 |
| 2 | Research and application of a power-flow-calculation method in multiterminal VSC-HVDC power grid显示文摘For demonstrating a multiterminal voltage-source converter(VSC)-based high-voltage DC(HVDC)(VSCHVDC) project, this study puts forward a technical route for calculating the power flow in a 500-kV VSC-HVDC power grid in comparison with that of an AC power grid. The Jacobian matrix used in the power-flow calculation was deduced through methods such as Newton–Laphson iteration and Taylor series expansion. Further, the operation effect of powerflow calculation on a true bipolar VSC-HVDC power grid was analyzed briefly. The elements of the Jacobian matrix corresponding to VSC were studied under the mode of droop control and the control strategy of VSC-HVDC power grid was analyzed in detail. The power-flow calculation model for VSC-HVDC power grid of the master–slave control mode was simplified using the PQ decomposition method of the power-flow calculation of an AC power grid. Moreover, a four-terminal model of the Zhangbei VSC-HVDC demonstration project was established and tested on MATLAB. The simulation results under two kinds of operating conditions were analyzed and compared to the results of BPA; the deviation between the power-flow results was studied. The results show that the proposed calculation method can provide a feasible support for calculating the power flow in VSC-HVDC grids. | Linlin Wu Xiaowei Fan Man Xu Zhendong Li Xiao Wang Xiaofei Zhang Haiwang Jin | 2019 | Global Energy Interconnection2019，2，1： | 8 |
| 3 | Increased hepatic expression of nitric oxide synthase type Ⅱ in cirrhotic rats显示文摘AIM: To determine the role and effect of nitric oxide synthase type Ⅱ (NOSII) in cirrhotic rats.METHODS: Expression of NOSⅡ mRNA was detected by real time RT-PCR. The activity of nitric oxide synthase and serum levels of NO, systemic and portal hemodynamics and degrees of cirrhosis were measured with high sensitive methods. Chinese traditional medicine tetrandrine was used to treat cirrhotic rats and to evaluate the function of NO.Double-blind method was applied during the experiment.RESULTS: The concentration of NO and the activity of NOS were increased markedly at all stages of cirrhosis, and iNOSmRNA was greatly expressed. Meanwhile the portalvenous-pressure (PVP), and portal-venous-flow (PVF) were significantly increased. NO, NOS and iNOSmRNA were positively correlated to the quantity of hepatic fibrosis.Tetrandrine significantly inhibited NO production and the expression of iNOSmRNA.CONCLUSION: Increased hepatic expression of NOSII is one of the important causes of hepatic cirrhosis and portal hypertension. | HaiWang Xiao-PingChen Fa-ZuQiu | 2004 | World Journal of Gastroenterology2004，10，13： | 6 |
| 4 | Month ahead average daily electricity price profile forecasting based on a hybrid nonlinear regression and SVM model:an ERCOT case study显示文摘With the deregulation of the electric power industry, electricity price forecasting plays an increasingly important role in electricity markets, especially for retailors and investment decision making. Month ahead average daily electricity price profile forecasting is proposed for the first time in this paper. A hybrid nonlinear regression and support vector machine(SVM) model is proposed. Offpeak hours, peak hours in peak months and peak hours in off-peak months are distinguished and different methods are designed to improve the forecast accuracy. A nonlinear regression model with deviation compensation is proposed to forecast the prices of off-peak hours and peak hours in off-peak months. SVM is adopted to forecast the prices of peak hours in peak months. Case studies based on data from ERCOT validate the effectiveness of the proposed hybrid method. | Ziming MA Haiwang ZHONG Le XIE Qing XIA Chongqing KANG | 2018 | Journal of Modern Power Systems and Clean Energy2018，6，2： | 6 |
| 5 | An Efficient Method for Estimating Capability Curve of Virtual Power Plant显示文摘To incorporate the operating constraints of a virtual power plant(VPP)in transmission-level operation and market clearing,the concept of the VPP capability curve(VPP-CC)is proposed which explicitly characterizes the allowable range of active and reactive power outputs of a VPP.A two-step projection-based calculation framework is proposed to approximate the VPP-CC by the convex hull of critical points on its perimeter.The output of the proposed algorithm is concise and can be easily incorporated in the existing system operation and market clearing.Case studies based on the IEEE 33 and 123 test feeders show the computational efficiency of the proposed method outperforms existing methods by 4~7 times.Additionally,many fewer inequalities are needed to depict the VPP-CC while achieving the comparative approximation accuracy compared to sampling-based methods,which will relieve the communication and computation burden. | Zhenfei Tan Haiwang Zhong Xuanyuan Wang Honghai Tang | 2022 | CSEE Journal of Power and Energy Systems2022，8，3： | 5 |
| 6 | Transmission network expansion planning with embedded constraints of short circuit currents and N-1 security显示文摘An approach of transmission network expan-sion planning with embedded constraints of short circuit currents and N-1 security is proposed in this paper.The problem brought on by the strong nonlinearity property of short circuit currents is solved with a linearization method based on the DC power flow.The model can be converted to a mixed-integer linear programming problem,realizing the optimization of planning model that considers the constraints of linearized short circuit currents and N-1 security.To compensate the error caused by the assump-tions of DC power flow,the compensation factor is pro-posed.With this factor,an iterative algorithm that can compensate the linearization error is then presented.The case study based on the IEEE 118-bus system shows that the proposed model and approach can be utilized to:opti-mize the construction strategy of transmission lines;ensure the N-1 security of the network;and effectively limit the short circuit currents of the system. | Jianxiao WANG Haiwang ZHONG Qing XIA Chongqing KANG | 2015 | Journal of Modern Power Systems and Clean Energy2015，3，3： | 5 |
| 7 | Correlation of expression of multidrug resistance protein and messenger RNA with ^(99m)Tc-methoxyisobutyl isonitrile (MIBI) imaging in patients with hepatocellular carcinoma显示文摘AIM:To explore whether P-glycoprotein (Pgp) and other pumps,multidrug resistance-associated protein (MRP) and lung resistance protein (LRP),could affect tumor accumulation and effluc of ^99mTc-MIBI in liver cancer.METHODS:Surgically treated 78 liver cancer patients were included in this study.Before surgery,^99mTc-MIBI SPECT was performed 15 min and 120 min after injection of 20 mCi ^99mTc-MIBI,respectively.Early uptake,delayed uptake (L/Nd),and washout rate (L/Nwr) of ^99mTc-MIBI were obtained. Expressions of Pgp,MRP and LRP were investigated with Western blotting and immunohistochemistry.Messenger RNA(mRNA) level of Pgp,MRP and LRP was determined by RT-PCR.RESULTS:No ^99mTc-MIBI uptakes in tumor lesions of 68 of 78 (87.2%) patients with hepatocellular carcinoma were found on ^99mTc-MIBI SPECT.P-gp expression was observed in tumor tissues of the patients with no uptake of ^99mTc-MIBO (p<0.017).No appreciable correlation was found between liver cancer ^99mTc-MIBI inages and expression of MRP or LRP on the level of protein or mRNA.CONCLUSION:^99mTc-MIBI SPECT is noninvasive,and useful in predicting the presence of MDR1 gene-encoded Pgp in patients with hepatocellular carcinoma. | HaiWang Xiao-PingChen Fa-ZuQiu | 2004 | World Journal of Gastroenterology2004，10，9： | 4 |
| 8 | Turbulent characteristics and rotation correction of wall function in rotating channel with high local rotation parameter显示文摘The turbulent fluctuation and the rotation correction of wall function law are investigated in the entrance section of a rotating channel. The one-dimensional hot wire probe and the X-type probe are utilized to measure the boundary layer at four streamwise stations. Through the analysis on the boundary layer near the leading side and trailing side, it is found that the turbulent fluctuation is promoted in the trailing side whereas suppressed in the leading side. This difference is attributed to the Coriolis instability near the trailing side. In addition, considering the local rotation parameter Rc, whose maximum absolute value is 0.014, is larger than that in previous research, whose maximum value is 0.007, the whole process of the relaminarization is captured. To understand this phenomenon better, the effects of the generation term and the Coriolis term in the transport equation of the Reynolds stress are discussed. In addition, the rotation correction of the viscous-Coriolis region and the Coriolis region are discussed, a new revising method for the wall function is proposed. | Zhi TAO Huijie WU Ruquan YOU Haiwang LI Kuan WEI | 2018 | Chinese Journal of Aeronautics2018，31，10： | 4 |
| 9 | Texas Electric Power Crisis of 2021 Warns of a New Blackout Mechanism显示文摘The Texas electric power crisis that occurred in February 2021 has drawn great attention internationally due to its severity and for not having been foreseen.In this rapid communication,we classify the 2021 Texas electric power crisis as an energy insufficiency-caused power crisis,which alerts of a new blackout mechanism.Different from capacity insufficiencycaused power crises in the past,the Texas electric power crisis of 2021 directly resulted from the long-duration extreme cold weather as well as fundamentally from the insufficiency of sustainable supply capability of energy.We begin this paper with a brief retrospect of the event and its consequences.Definitions of energy/capacity insufficiency-caused power crises are given,as well as an overview of the supply and demand during the event,based on realistic operation data.Quantitative simulations are then conducted to reveal the underlying reasons for the power crisis and reveal how to better prepare for the future.Finally,several insights and suggestions on handling the new mode of blackout in the future are proposed and discussed. | Guanglun Zhang Haiwang Zhong Zhenfei Tan Tong Cheng Qing Xia Chongqing Kang | 2022 | CSEE Journal of Power and Energy Systems2022，8，1： | 4 |
| 10 | Proteomic response analysis of endothelial cells of human coronary artery to stimulation with carbachol显示文摘AIM: To identify the molecular basis of the endothelial target for acetylcholine (ETA). METHODS: Proteomic methods were used to monitor changes in protein expression in the first 10h following the stimulation of human coronary endothelial cells with carbachol 100μmol/L. Thirty proteins showing the largest changes were identified by mass spectrometry. RESULTS: Based on analysis with Image Master 2-D Elite software, about 623 protein spots were detected in control cells and 825 protein spots in carbachol-treated cells, the matching rate was 68.1%. Among all the detected spots, 39 were up-regulated and 29 were down-regulated, showing detectable changes varied from 1.7-3.8 folds. Forty one spots in the peptide mass fingerprints were successfully obtained. The most interesting feature was that all the four newly synthesized proteins belonged to the heat shock protein family.CONCLUSION: These identified proteins played key roles in the molecular mechanism of ETA. | MinYU Dong-meiCHEN GangHU HaiWANG | 2004 | Acta Pharmacologica Sinica2004，25，9： | 3 |
| 11 | A STUDY ON THE COUNTER-INTUITIVE BEHAVIORS OF PIN-ENDED BEAMS UNDER PROJECTILE IMPACT显示文摘在射弹影响下面的结束大头针的横梁的违反直觉的行为在这篇论文与 ANSYS/LS-DYNA 被调查。它详细学习 theirdisplacement 时间历史曲线,最后的使变形的形状,精力关系和射弹影响与他们的违反直觉的行为有关的速度范围。他们的违反直觉的行为上的影响位置的影响也被讨论。结果显示出那不管横梁上的影响位置在哪儿,只要影响速度躺在一个合适的范围以内,卡住的横梁的违反直觉的行为将发生。相应于 thecounter 直觉的行为发生,在横梁的排水量历史曲线的反弹的数字随影响速度的增加从一些时间减少到零。相应于违反直觉的行为的横梁的最后的变丑模式将出现在对称的 andunsym 韵律的形式不管影响位置在哪儿;横梁的违反直觉的行为的发生 thefirst 的影响速度与影响位置的偏差慢慢地增加离开中间跨度。 | Li Haiwang Qin Dongqi | 2006 | Acta Mechanica Solida Sinica2006，19，2： | 3 |
| 12 | Soft Open Point Planning in Renewable-dominated Distribution Grids with Building Thermal Storage显示文摘With an increasing integration of intermittent distributed energy resources(DERs),the consequent voltage excursion and thermal overloading issues limit the self-sufficiency of distribution networks(DNs).The concept of soft open point(SOP)has been proposed as a promising solution to improve the hosting capacity of DNs.In this paper,considering the ability of building thermal storage(BTS)to increase the penetration of renewable energy in DNs,we provide an optimal planning framework for SOP and DER.The optimal planning model is aimed at minimizing the investment and operational costs while respecting various constraints,including the self-sufficiency requirement of the DN,SOP,building thermal storage capacity and DER operations,etc.A steady-state SOP model is formulated and linearized to be incorporated into the planning framework.To make full use of the BTS flexibility provided by ubiquitous buildings,a differential equation model for building thermal dynamics is formulated.A hybrid stochastic/robust optimization approach is adopted to depict the uncertainties in renewable energy and market prices.IEEE 33-bus feeder and a realistic DN in the metropolitan area of Caracas are tested to validate the effectiveness of the proposed framework and method.Case studies show that SOP/BTS plays a complementary and coordinated coupling role in the thermo-electric system,thereby effectively improving the hosting capacity and self-sufficiency of DNs. | Tiance Zhang Jianxiao Wang Haiwang Zhong Gengyin Li Ming Zhou Dejie Zhao | 2023 | CSEE Journal of Power and Energy Systems2023，9，1： | 3 |
| 13 | The cooling performance of three-row compound angle holes on the suction surface of a rotating turbine blade显示文摘Experiments were carried out to study the effects of compound angle,hole arrangement,and blowing ratio on the film cooling performance of multiple rows of holes on the suction surface of a turbine blade.The turbine worked at rotational speed of 600 rpm corresponding to the rotational Reynolds number of 5.36105.Three rows of cylindrical holes arranged in line or in stagger were drilled on the rotor blade suction surface at the streamwise location of 12.4%,17.8%,and 23.2%,respectively.Three compound angles,with the same streamwise angle of 45but different lateral deflection angles of 45,0,and45,were studied.The film cooling effectiveness was obtained using pressure sensitive paint(PSP)technique with average blowing ratios varied from 0.5 to 2.0.The results showed that the application of compound angle changes the jet direction in the near-hole region and makes the film spread laterally.Compared with the film cooling without compound angle,using positive and negative compound angle can improve overall average film cooling effectiveness by about 20%and 25%,respectively.The effects of the secondary flow also can be weakened.A stagger film trajectory arrangement can achieve more uniform film coverage with higher overall film cooling effectiveness.The film trajectory arrangement of a positive compound angle injection is determined by the combined effect of hole arrangement and blowing ratio.While,the film trajectory arrangement of a negative compound angle injection is almost the same as the hole arrangement and nearly does not change with the blowing ratio. | Zhiyu Zhou Haiwang Li Gang Xie Shuangzhi Xia Jianjun Zhou | 2021 | Propulsion and Power Research2021，10，1： | 2 |
| 14 | Review of Learning-assisted Power System Optimization显示文摘With dramatic breakthroughs in recent years,machine learning is showing great potential to upgrade the toolbox for power system optimization.Understanding the strength and limitation of machine learning approaches is crucial to decide when and how to deploy them to boost the optimization performance.This paper pays special attention to the coordination between machine learning approaches and optimization models,and carefully evaluates how such data-driven analysis may improve the rule-based optimization.The typical references are selected and categorized into four groups:the boundary parameter improvement,the optimization option selection,the surrogate model,and the hybrid model.This taxonomy provides a novel perspective to elaborate the latest research progress and development.We further compare the design patterns of different categories,and discuss several key challenges and opportunities as well.Deep integration between machine learning approaches and optimization models is expected to become the most promising technical trend. | Guangchun Ruan Haiwang Zhong Guanglun Zhang Yiliu He Xuan Wang Tianjiao Pu | 2021 | CSEE Journal of Power and Energy Systems2021，7，2： | 2 |
| 15 | Atomic oxygen-resistant and transparent polyimide coatings from [3,5-bis(3-aminophenoxy)phenyl]diphenylphosphine oxide and aromatic dianhydrides: Preparation and characterization显示文摘 | Zhuo Li Haiwang Song Minhui He Jingang Liu Shiyong Yang | 2012 | Progress in Organic Coatings (-)2012，，1： | 2 |
| 16 | Experimental investigation of surface roughness effects on flow behavior and heat transfer characteristics for circular microchannels显示文摘This paper experimentally investigates the effect of surface roughness on flow and heat transfer characteristics in circular microchannels. All test pieces include 44 identical, parallel circular microchannels with diameters of 0.4 mm and 10 mm in length. The surface roughness of the microchannels is R_a= 0.86, 0.92, 1.02 lm, and the Reynolds number ranges from 150 to 2800.Results show that the surface roughness of the circular microchannels has remarkable effects on the performance of flow behavior and heat transfer. It is found that the Poiseuille and Nusselt numbers are higher when the relative surface roughness is larger. For flow behavior, the friction factor increases consistently with the increasing Reynolds number, and it is larger than the constant theoretical value for macrochannels. The Reynolds number for the transition from laminar to turbulent flow is about 1500, which is lower than the value for macrochannels. For the heat transfer property, Nusselt number also increases with increasing Reynolds number, and larger roughness contributes to higher Nusselt number. | Yuan Xing Tao Zhi Li Haiwang Tian Yitu | 2016 | Chinese Journal of Aeronautics2016，29，6： | 2 |
| 17 | Atomic oxygen-resistant and transparent polyimide coatings from [3,5-bis(3-aminophenoxy)phenyl]diphenylphosphine oxide and aromatic dianhydrides: Preparation and characterization显示文摘 | Zhuo Li Haiwang Song Minhui He Jingang Liu Shiyong Yang | 2012 | Progress in Organic Coatings (-)2012，，1： | 1 |
| 18 | Coupon incentive-based demand respon se: theory and case study显示文摘 | ZHONG Haiwang XIE Le XIA Qing | 2013 | IEEE Transactions on Power Systems2013，28，2： | 1 |
| 19 | Coupon Incentive- based demand response: Theory and case study显示文摘 | Zhong Haiwang Xie le Xia qing | 2013 | IEEE Transactions on Power Systems2013，28，2： | 1 |
| 20 | Hot-wire experimental investigation on turbulent Prandtl number in a rotating non-isothermal turbulent boundary layer显示文摘This experiment used a parallel array of hot wire probes to simultaneously measure the temperature and velocity fields in the non-isothermal turbulent boundary layer of a rotating straight channel. The Reynolds numbers are 15,000 and 25,000, respectively. The rotation numbers are 0, 0.07, 0.14, 0.21 and 0.28, respectively. The purpose of this study is to calculate the turbulent Prandtl number in a rotating non-isothermal turbulent boundary layer. Due to the difficulty in measuring local turbulent Prandtl numbers, this study focuses on the average turbulent Prandtl numbers in the logarithmic region instead. Under static conditions, this value is taken as 0.9 normally. This research finds that rotation conditions can affect the turbulent Prandtl number by affecting the properties of velocity and temperature boundary layers. The change range of the turbulent Prandtl number is roughly 0.6–1.1. The influence of the leading side is greater than that of the trailing side, especially at high rotation numbers. This can provide validation and guidance for numerical simulation. Other information within the turbulent boundary layer is also discussed. It is hoped that this study would enhance our understanding of the mechanism of turbulent flow in the turbulent layer at rotating conditions. | Ran Gao Haiwang Li Ruquan You Gangfu Li Shuangzhi Xia | 2020 | Propulsion and Power Research2020，9，4： | 1 |
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