Experimental research on underwater powering performance of submarine model was conducted to analyzing its effective wake fraction.The nominal wake and the 3D wake distribution at the propeller disk were obtained by using 3D wake testing system.The results showed that the wake at the propeller disk is mainly axial wake, the major high-wake part is observed between two rudders at the inside radius, but at the outside radius, the lower-wake peak exactly appears behind the rudders.Because of the pumping action of the propeller, the velocity at the propeller disk increases and the effective wake is less than nominal wake.%对某艇模进行水下快速性试验,分析得到其自航状态下的实效伴流分数,采用三维伴流测试系统对其艉流场进行伴流测量,得到其标称伴流及三向伴流分布.结果表明,艇模桨盘面处伴流以轴向伴流为主,内半径在艉舵之间产生了范围较大的轴向高伴流区,而外半径在舵后产生了范围较小的小伴流峰,且由于螺旋桨的抽吸作用,导致桨盘面处流速增大,因而实效伴流小于标称伴流.
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