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引射喷管流量及推力特性数值研究 被引量:2
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作者 邓文剑 代瑛 王家启 《航空科学技术》 2014年第6期9-13,共5页
设计了多个引射喷管方案对引射喷管的流量和推力特性进行了研究。采用数值模拟手段对这些方案进行了多状态的性能计算,详细总结各方案在不同状态下的性能特点及规律,并从理论角度对引起其变化规律的原因进行了详细分析。研究结果表明外... 设计了多个引射喷管方案对引射喷管的流量和推力特性进行了研究。采用数值模拟手段对这些方案进行了多状态的性能计算,详细总结各方案在不同状态下的性能特点及规律,并从理论角度对引起其变化规律的原因进行了详细分析。研究结果表明外管道出口几何尺寸对引射喷管性能影响规律是随主喷管落压比的不同而不同的。 展开更多
关键词 引射喷管 次流流量 推力 数值模拟
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Flow Range Enhancement by Secondary Flow Effect in Low Solidity Circular Cascade Diffusers 被引量:4
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作者 Daisaku Sakaguchi Min Thaw Tun +1 位作者 Kanata Mizokoshi Daiki Kishikawa 《Journal of Thermal Science》 SCIE EI CAS CSCD 2014年第4期391-400,共10页
High-pressure ratio and wide operating range are highly required for compressors and blowers. The technical issue of the design is achievement of suppression of flow separation at small flow rate without deteriorating... High-pressure ratio and wide operating range are highly required for compressors and blowers. The technical issue of the design is achievement of suppression of flow separation at small flow rate without deteriorating the efficiency at design flow rate. A numerical simulation is very effective in design procedure, however, cost of the numerical simulation is generally high during the practical design process, and it is difficult to confn'm the optimal design which is combined with many parameters. A multi-objective optimization technique is the idea that has been proposed for solving the problem in practical design process. In this study, a Low Solidity circular cascade Diffuser (LSD) in a centrifugal blower is successfully designed by means of multi-objective optimization technique. An optimization code with a meta-model assisted evolutionary algorithm is used with a commercial CFD code ANSYS-CFX. The optimization is aiming at improving the static pressure coefficient at design point and at low flow rate condition while constraining the slope of the lift coefficient curve. Moreover, a small tip clearance of the LSD blade was applied in order to activate and to stabilize the secondary flow effect at small flow rate condition. The optimized LSD blade has an extended operating range of 114 % towards smaller flow rate as compared to the baseline design without deteriorating the diffuser pressure recovery at design point. The diffuser pressure rise and operating flow range of the optimized LSD blade are experimentally verified by overall performance test. The detailed flow in the diffuser is also confirmed by means of a Particle Image Velocimeter. Secondary flow is clearly captured by PIV and it spreads to the whole area of LSD blade pitch. It is found that the optimized LSD blade shows good improvement of the blade loading in the whole operating range, while at small flow rate the flow separation on the LSD blade has been successfully suppressed by the secondary flow effect. 展开更多
关键词 Low solidity circular cascade diffuser Multi-objective optimization Secondary flow Flow range enhancement
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The influence of synthetic jet excitation on secondary flow in compressor cascade 被引量:6
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作者 Yanming LIU, Tuo SUN, Chaobin GUAN and Baoguo WANG School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China Assistant Professor 《Journal of Thermal Science》 SCIE EI CAS CSCD 2010年第6期500-504,共5页
The detailed numerical simulation has been carried out to investigate the effect of synthetic jet excitation on the secondary flow at 5° incidence in a compressor cascade, in which the synthetic jet actuation is ... The detailed numerical simulation has been carried out to investigate the effect of synthetic jet excitation on the secondary flow at 5° incidence in a compressor cascade, in which the synthetic jet actuation is equipped on the suction surface. The influence of excitation position, one fixed near the trailing edge and the other fixed a little far from the trailing edge, has also been studied. The results show that unsteady disturbance of desirable synthetic jet effectively enhances the mixing of the fluid inside the separation region, which reduces the vortex intensity and the energy loss, improves the flow status in the cascade, and also suppresses velocity fluctuation near the trailing edge. Additionally, the actuation fixed near the separation region proves to be more effective and exit load distribution is more uniform due to the employment of the synthetic jet. 展开更多
关键词 synthetic jet actuator compressor cascade LOSS velocity fluctuation
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