3.2 三孔探针测定旋转流道出口相对流的结果。对有大速度梯度喷嘴喷流的场合,模拟一个也有静压梯度的实际叶轮流道,对这些流道流的出流进行了相对测定。图8所示为上节中供试三孔取压头部中误差最小的多角形探针的测量结果,流道的旋转速度 N是150rpm,轴向速度与圆周速度比 Vm/u为0.9。记号 O 所示的测定值自上而下分别是出口角β,出口速度 W、全压 P_T 以及静压 P_S、图 3.2 Three-hole probe to determine the results of the relative flow of the rotating channel outlet. In the case of a jet with a large velocity gradient, an actual impeller runner with a static pressure gradient is simulated and the outflow of these runners is measured. Figure 8 shows the results of the measurement of the polygon probe with the smallest error in the test head for the three-hole pressurisation in the previous section. The runner rotation speed N was 150 rpm and the axial speed to circumferential speed ratio Vm / u was 0.9. The measured values ​​indicated by symbol O are the exit angle β, the exit speed W, the total pressure P_T and the static pressure P_S from top to bottom, respectively