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| 1 | Experimental and Numerical Investigation of Centrifugal Pumps with Asymmetric Inflow Conditions显示文摘Most of the times pumps operate off best point states.Reasons are changes of operating conditions,modifications,pollution and wearout or erosion.As consequences non-rotational symmetric flows,transient operational conditions,increased risk of cavitation,decrease of efficiency and unpredictable wearout can appear.Especially construction components of centrifugal pumps,in particular intake elbows,contribute to this matter.Intake elbows causes additional losses and secondary flows,hence non-rotational velocity distributions as intake profile to the centrifugal pump.As a result the impeller vanes experience permanent changes of the intake flow angle and with it transient flow conditions in the blade channels.This paper presents the first results of a project,experimentally and numerically investigating the consequences of non-rotational inflow to leading edge flow conditions of a centrifugal pump.Therefore two pumpintake-elbow systems are compared,by only altering the intake elbow geometry:a common single bended 90°elbow and a numerically optimized elbow(improved regarding rotational symmetric inflow conditions and friction coefficient).The experiments are carried out,using time resolved stereoscopic PIV on a full acrylic pump with refractions index matched(RIM)working fluid.This allows transient investigations of the flow field simultaneously for all blade leading edges.Additional CFD results are validated and used to further support the investigation i.e.for comparing an analog pump system with ideal inflow conditions. | Sten Mittag Martin Gabi | 2015 | Journal of Thermal Science2015，24，6： | 5 |
| 2 | Flow Field and Performance of Cross Flow Fans——Experimental and Theoretical Investigations显示文摘Due to the construction and the operaling principle the prediction of performance of Cross Flow Fans (CFF) is difficult and the knowledge about the internal flow regime is limited. To investigate the impact of geometrical parameters on the performance of CFF, experimental investigations, using Particle Imaging Velocimetry (PIV),and CFD calculations were carried out. Some results of PIV measurements and CFD calculations are presented,which give an impression of the internal flow and confirm the numerical calculations. | Martin Gabi Simon Dornstetter Toni Klemm | 2003 | Journal of Thermal Science2003，12，3： | 3 |
| 3 | Numerical Noise Prediction in Fluid Machinery显示文摘Numerical methods successively became important in the design and optimization of fluid machinery. However, as noise emission is considered, one can hardly find standardized prediction methods combining flow and acoustical optimization. Several numerical field methods for sound calculations have been developed. Due to the complexity of the considered flow, approaches must be chosen to avoid exhaustive computing. In this contribution the noise of a simple propeller is investigated. The configurations of the calculations comply with an existing experimental setup chosen for evaluation. The used in-house CFD solver SPARC contains an acoustic module based on Ffowcs Williams-Hawkings Acoustic Analogy. From the flow results of the time dependent Large Eddy Simulation the time dependent acoustic sources are extracted and given to the acoustic module where relevant sound pressure levels are calculated. The difficulties, which arise while proceeding from open to closed rotors and from gas to liquid are discussed. | Iris PANTLE Franco MAGAGNATO Martin GABI | 2005 | Journal of Thermal Science2005，14，3： | 2 |
| 4 | Numerical and experimental investigations of cross-flow fans显示文摘 | Martin Gabi Toni Klemm | 2004 | Journal of Computational and Applied2004，5，2： | 1 |
| 5 | Investigations on the Flow Field in an Unshrouded Pump Impeller Geometry显示文摘Transient CFD simulations are performed to investigate the flow behaviour inside an unshrouded pump using the SAS method. Two blade designs are compared at two different tip clearances and the results are validated by measurements. The detected vortex structure is visualized by the normalized helicity, further discussed regarding its development and behaviour and finally implicated to the efficiency of the two different blade designs. | Sten Sieber Friedrich Frhlig Saban Caglar Martin Gabi | 2012 | Journal of Thermal Science2012，21，2： | 1 |
| 6 | Mycobacterium avium subspecies paratuberculosis and Crohn’s disease: a systematic review and meta-analysis显示文摘 | Martin Feller Karin Huwiler Roger Stephan Ekkehardt Altpeter Aijing Shang Hansjakob Furrer Gaby E Pfyffer Thomas Jemmi Andreas Baumgartner Matthias Egger | 2007 | The Lancet Infectious Diseases2007，，： | 1 |
| 7 | Numerical and Experimental Investigations of Cross-Flow Fans 显示文摘 | Martin Gabi Toni Klemm | 2004 | Journal of Computational and Applied2004，5，2： | 1 |
| 8 | Prediction of the Resonance Characteristics of Combustion Chambers on the Basis of Large-Eddy Simulation显示文摘In the last few years intensive experimental investigations were performed at the University of Karlsruhe to develop an analytical model for the Helmholtz resonator-type combustion system. In the present work the resonance characteristics of a Helmholtz resonator-type combustion chamber were investigated using large-eddy simulations (LES), to understand better the flow effects in the chamber and to localize the dissipation. In this paper the results of the LES are presented, which show good agreement with the experiments. The comparison of the LES study with the experiments sheds light on the significant role of the wall roughness in the exhaust gas pipe. | Franco MAGAGNATO Balázs PRITZ Horst BCHNER Martin GABI | 2005 | Journal of Thermal Science2005，14，2： | 1 |
| 9 | Numerical and experimental investigations of cross:flow fans显示文摘 | Martin Gabi Toni Klemm | 2004 | Journal of Computational and Applied2004，5，2： | 1 |
| 10 | Adherence and mental side effects during hepatitis C treatment with interferon alfa and ribavirin in psychiatric risk groups显示文摘 | Martin Schaefer Folkhard Schmidt Christian Folwaczny Reinhard Lorenz Gaby Martin Norbert Schindlbeck Walter Heldwein Michael Soyka Heinz Grunze August Koenig Klaus Loeschke | 2003 | Hepatology2003，，2： | 1 |
| 11 | Numerical and Experimental Investigations of Cross-Flow Fans 显示文摘 | Martin Gabi Toni Klemm | 2004 | Journal of Computational and Applied2004，5，2： | 1 |
| 12 | Empirical Model for the Quantitative Prediction of Losses of Radial Fans based on CFD Calculations显示文摘In a classical layout process of a fan the quantity of losses is estimated as a sum and expressed in the overall efficiency rate η. However the characteristic of the pressure rise, the losses and the efficiency rate beside the design point is not known. Against this background a numerical model was developed to calculate quantitative values of occurring losses at radial fan impellers at an early stage in the design process. It allows to estimate the pressure rise and efficiency rate of a given fan geometry at and beside the design point. The physics of losses are described in literature, but obtaining quantitative values is still a challenge. As common in hydraulic theory the losses are calculated with analytic formulas supported by coefficients and efficiency rates, which have to be determined empirically. This paper shows the method how to determine the coefficients for a given radial fan. Therefore a representative radial fan with backward curved blades was designed in reference to classical design guidelines. Performance measuring was done conform to ISO 5801. The flow was calculated at 8 different operation points using CFD methods. The RANS equations are solved by using the SST-k-omega turbulence model. The flow domain consists of one blade section including inlet channel and outflow chamber. Spatial discretization is done by a block-structured mesh of approx. 1.8 million cells. Performance data show a very good agreement between measurement and calculation. | Heiko Ratter Saban Caglar Martin Gabi | 2013 | Journal of Thermal Science2013，22，4： | 0 |
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