采用大涡模拟方法对面积比为5.3的不同型面锥形扩压器进行数值计算，包括直线、等压力梯度、等速度梯度和相切双圆弧4种型面，在进口流量均为30 m/s的条件下对比不同型面锥形扩压器的总体性能、流动特性和涡量分布。结果表明：等压力梯度和等速度梯度型面的扩压器总体性能更好，静压恢复系数分别为0.771 3和0.782 6，与基准直线型面相比分别提高了22%和23.83%；等压力梯度和等速度梯度型面的扩压器流动初始分离点相对延后，分离点与扩压器的轴向距离之比分别为0.5和0.43，直线和相切双圆弧型面的该值分别为0.18和0.21；等压力梯度和等速度梯度型面的扩压器内部涡对扩压器的堵塞较小，涡占扩压器径向截面比例分别为50%和45%，直线和相切双圆弧型面涡占比均大于95%。

The large eddy simulation method is used to numerically calculate the conical diffusers with different profiles with an area ratio of 5.3,including four profiles of straight line,constant pressure gradient,constant velocity gradient and tangent doublearc,comparing the overall performance,flow characteristics and vorticity distribution of different conical diffusers with different profiles under the inlet condition of 30 m/s.The research results show that the overall performance of the diffusers with constant pressure gradient and constant velocity gradient profile is better,the static pressure recovery coefficients are 0.771 3 and 0.782 6,which are respectively 22% and 23.83% higher than the reference linear profile.The initial separation point of the diffuser flow with constant pressure gradient and constant velocity gradient profile is relatively delayed,and the ratios of the separation point to the axial distances of the diffuser are 0.5 and 0.43 respectively,the values of linear and tangent doublearc profiles are 0.18 and 0.21.The internal vortices of the diffuser with the constant pressure gradient and constant velocity gradient profile block the diffuser less.The vortices account for 50% and 45% of the diffuser radial crosssection respectively.The vortices of the linear and tangent doublearc profile account for more than 95% of the diffuser radial crosssection.

TK221

国家科技重大专项（2017-Ⅰ-0011-0012）