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| 1 | Design and Optimization of a Single Stage Centrifugal Compressor for a Solar Dish-Brayton System显示文摘According to the requirements of a solar dish-Brayton system,a centrifugal compressor stage with a minimum total pressure ratio of 5,an adiabatic efficiency above 75% and a surge margin more than 12% needs to be designed.A single stage,which consists of impeller,radial vaned diffuser,90° crossover and two rows of axial stators,was chosen to satisfy this system.To achieve the stage performance,an impeller with a 6:1 total pressure ratio and an adiabatic efficiency of 90% was designed and its preliminary geometry came from an in-house one-dimensional program.Radial vaned diffuser was applied downstream of the impeller.Two rows of axial stators after 90° crossover were added to guide the flow into axial direction.Since jet-wake flow,shockwave and boundary layer separation coexisted in the impeller-diffuser region,optimization on the radius ratio of radial diffuser vane inlet to impeller exit,diffuser vane inlet blade angle and number of diffuser vanes was carried out at design point.Finally,an optimized centrifugal compressor stage fulfilled the high expectations and presented proper performance.Numerical simulation showed that at design point the stage adiabatic efficiency was 79.93% and the total pressure ratio was 5.6.The surge margin was 15%.The performance map including 80%,90% and 100% design speed was also presented. | Yongsheng Wang Kai Wang Zhiting Tong Feng Lin Chaoqun Nie Abraham Engeda | 2013 | Journal of Thermal Science2013，22，5： | 5 |
| 2 | Performance analysis and improvement of a high flow coefficient centrifugal compressor显示文摘Very high flow coefficient centrifugal compressor stages are mostly applied as the first stages of multistage compressors.The performance of this type of stages is critical to the entire centrifugal compressors,but surprisingly little related information is available in the open literature.A centrifugal compressor with high inlet flow coefficient of 0.2,presenting a narrow operating range and unstable running situation even at design speed during the test,is investigated here.To reveal flow details in this centrifugal compressor,numerical simulations have been carried out and indicate that excessive impeller flow diffusion results in the poor performance of this centrifugal compressor.With the same inlet flow coefficient,six redesign cases coming from an in-house one-dimensional analysis program are proposed together with impeller trimming and equal flow area design method for corresponding vaneless diffuser.Performance comparison among these redesign centrifugal compressors is presented and the most suitable one is recommended for test in the future.In addition,three redesign cases with lower inlet flow coefficient developed by means of flow trimming are shown in the end to satisfy potential application areas.Finally,the results in this study can provide valuable reference information for multistage centrifugal compressor design. | WANG YongSheng WANG Kai LIN Feng NIE ChaoQun ENGEDA Abraham | 2014 | Science China(Technological Sciences)2014，57，8： | 3 |
| 3 | Performance Character- istics of Regenerative Flow Compressors for Natural Gas Com- pression Application显示文摘 | Mukamnn Raheel Abraham Engeda | 2005 | Journal of Energy Resources Tech- nology2005，217，： | 1 |
| 4 | A Numeri- cal Investigation on the Volute/diffuser Interaction Due to the Axial Distortion at the impeller Exit 显示文摘 | Fahua Gu Abraham Engeda Mike Cave | 2001 | ASME Journal Fluids Engineering2001，123，： | 1 |
| 5 | Systematic Design Approach for Radial Blade Regenerative Turbomachines显示文摘 | Raheel Muhammad M Engeda Abraham | 2005 | Journal of Propulsion and Power2005，21，5： | 1 |
| 6 | Experimental and numerical investigation of the performance of a 240 kW centrifugal compressor with different diffusers显示文摘 | ABRAHAM Engeda | 2003 | Experimental Thermal and Fluid Science2003，28，1： | 1 |
| 7 | A numerical investigation on the volute/diffuser interaction due to the axial distortion at the impeller exit 显示文摘 | Fahua Gu Abraham Engeda A | 2001 | Journal of Fluids Engineering2001，123，3： | 1 |
| 8 | Experimental and Numerical Investigation of The Performance of a 240 kW Centrifugal Compressor with Different Diffusers 显示文摘 | Abraham Engeda | 2003 | Experimental Thermal and Fluid Science2003，28，5： | 1 |
| 9 | A numerical investi-gation on the volute/diffuser interaction due to the axial distortion at the impeller exit显示文摘 | Gu Fahua Abraham Engeda | 2001 | ASME Journal of Fluid Engineering2001，123，9： | 1 |
| 10 | Experimental and numerical investigation of the performance of a 240kW centrifugal compressor with different diffusers显示文摘 | Abraham Engeda | 2003 | Experimental Thermal and Fluid Science2003，28，： | 1 |
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