VGT蜗壳流道截面上速度分布的试验研究

摘要

To measure the flow of double tongue-boards VGT turbine scroll with IFA300 hot - film anemometer and X probes a test device is designed.As the openness αA an d αB of the board A and B equal zero respectively,the throug h-flow velocity VX in the middle of flow path is similar to free vortex,but near the wall VX is less than the one estimated by free vortex.When αA is not zero,V X is larger than the one estimated.With different αA transverse-flow vel ocity VZ has similar distributions,and is 16 to 25 percentag e of VX.With Z increase and different αA,in the inner an d outer of flow path the radical -flow velocity VY has different distributions and is 25 to 30 percentage of VX.%设计了一种双舌型挡板VGT蜗壳内流场测试装置，用IFA300热膜风速仪X型探针测量了其速度 场。结果表明：(1)当A、B挡板开度αA＝00、αB＝00时，流道中间处通流 速度VX分布接近自由涡流规律，壁面处VX小于自由涡流估算值；当αA≠00 、αB＝00时，VX大于自由涡流估算值；(2)不同α B时，横流速度VZ分 布类似，VZ是VX的16％～25％；(3)α A变化时，随Z的 增加，在流道内侧和外侧径流速度VY分布不同，VY是VX的25％～3 0％。