【摘要】 本文通过准三元流动分析和进一步发展的分离流动计算方法,对在变工况下工作的涡轮增压器造平φ75mm叶轮的内部流场进行了数值计算和分析,深入地揭示了小功率向心透平叶轮内部的流动规律及分离特性,提出了抑制分离、改善流动的叶轮改型的关键措施及进一步研究的方向。对增压器一类的小功率向心造平叶轮的设计和改进研究具有实用意义。更多还原

【Abstract】 Small radial inflow turbines are widely used in many fields, and most ofthem always operate in off-design condition. But the flow efficiency of theturbine impeller, due to the lack of comprehensive understanding of its internalflow feature, is too low to provide satisfactory off-design performance formany applications, particularly for vehicle engine turbocharging. Therefore, it isvery important to study the impeller flow field to improve its flow efficiency. In this paper, the flow fields in φ75 mm impellers for WZJ-70 vehicleturbocharger turbine are numerically investigated through the quasi-threedimensional flow analysis combined with separated flow prediction in a widerrange of off-design conditions. The internal flow characteristics and separstionpatterns usually occurred in suchlike impellers are presented in details. Some keymeasures and the further research for improving impeller efficiency by revisingthe impeller profiles are discussed and proposed, which would be benefical toimpeller design and development for small radial inflow turbines.更多还原