To redesign the mixed flow volute shell of a certain turbocharger ,the influence of four different flow passages on turbocharger performance were analyzed with Numeca software .It was found that the pear-shaped section flow passage was op-timal and it was determined as the design scheme .For the designed volute and original run-off volute ,the comparison was con-ducted in all conditions and the mixed flow volute was proved to be better than the original volute .In order to verify the accura-cy of the analysis results ,the designed volute was produced with the rapid prototyping technology and was tested on a test bench .The data analysis results agreed well with the test results .%为某定型增压器重新设计混流式蜗壳，使用Numeca数值分析软件分析4种不同形式流道对涡轮机性能的影响，发现梨形截面流道的效果最佳，确定梨形截面流道为设计方案。对设计方案和原径流式蜗壳进行全工况对比分析，结果表明混流蜗壳的性能优于原径流式蜗壳。为了验证分析结果的准确性，采用快速成型技术加工了新设计的蜗壳，并利用涡轮特性台架进行性能测试，结果与数据分析结果较为一致。
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