摘要
采用NUMECA数值分析软件,研究了JP60涡轮增压器叶顶间隙分布、trim值变化对压气机性能的影响,并就设计工况下增压器压气机内部流场分布进行了分析。结果表明:增大尾缘间隙,在设计转速附近防喘振能力较好;增大前缘间隙,在各转速下堵塞流量略占优势,且各工况下压比最高,高效率圈上移,高速性能较好。而减小叶轮大径,不同工况下喘振流量增加,而且变化幅度较大;减小叶轮小径,不同工况下的堵塞流量略为减少。
The effect of clearance and trim on the compressor performance in JP60 turbocharger is studied by using NUMECA numerical software in this paper. The inner flow distribution of the compressor in the design speed point is analyzed. It indicates that when increasing the clearance of the trailing edge, it is helpful for deceasing the mass flow of surge point near design speed condition;when increasing the clearance of the leading edge,the mass flow in choke point is a little bigger at all the operating points,besides,the pressure ratio is the highest,and the circle of efficiency is moving upward than former, it means that it is good for high speed condition. However, at different operating points, when decreasing the big diameter of impeller,the mass flow of surge point increases a lot;when decreasing the small diameter, the mass flow of choke point decreases just a little.
出处
《农业装备与车辆工程》
2011年第11期44-47,共4页
Agricultural Equipment & Vehicle Engineering
