【摘要】 设计了一种双舌型挡板 VGT蜗壳内流场测试装置 ,用 IFA30 0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=0 0 、αB=0 0 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≠ 0 0、αB=0 0时 ,VX 大于自由涡流估算值 ;(2 )不同 αB时 ,横流速度 VZ分布类似 ,VZ是 VX 的 16 %～ 2 5 % ;(3) αA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 2 5 %～ 30 %更多还原

【Abstract】 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 α A and α B of the board A and B equal zero respectively,the through-flow velocity V X in the middle of flow path is similar to free vortex,but near the wall V X is less than the one estimated by free vortex.When α A is not zero,V X is larger than the one estimated.With different α A transverse-flow velocity V Z has similar distributions,and is 16 to 25 percentage of V X.With Z increase and different α A,in the inner and outer of flow path the radical-flow velocity V Y has different distributions and is 25 to 30 percentage of V X.更多还原