匹配某小排量国Ⅵ柴油机时，增压器压气机出现了喘振现象，导致发动机扭矩明显降低，需要设计一款新型压气机。通过加大压气机叶片θ角、叶片出口β角、叶片弦长、叶轮进口尺寸、叶轮出口宽度，减小扩压器出口与叶轮出口直径的比值，设计了优化方案。进行了优化方案和原方案的压气机性能仿真计算、增压器台架压气机性能试验、发动机台架增压器性能匹配试验，结果表明：优化方案改善了压气机小流量区域的稳定性，提高了堵塞流量；在发动机全转速范围内，流量减小时压比特性曲线斜率始终为负，压气机运行稳定，未发生喘振；发动机可以加载到最大设计扭矩，提升了发动机的动力性能。
When matching a small-displacement China Ⅵ diesel engine, the surge phenomenon appeared in the turbocharger compressor, resulting in a significant reduction in engine torque. A new type of compressor needed to be designed. By increasing the θ angle of compressor blade, the β angle of blade outlet, the chord length of blade, the size of impeller inlet and the width of impeller outlet and decreasing the diameter ratio of expander outlet to impeller outlet, the optimization scheme was designed. For the optimized and original schemes, the compressor performance simulation calculation, the compressor bench compressor performance test and the engine bench turbocharger performance matching test were carried out. The results show that the optimization scheme improves the stability of compressor in the small flow area and the blocked flow rate. Within the full speed range of engine, the slope for the characteristic curve of pressure ratio is always negative when the flow decreases, and the operation of compressor is stable without surge. The engine can load to the maximum designed torque, which improves the power performance of engine.
