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通过对长径比 L/D =1.2 5 ～ 4 .0、进口倒 (圆 )角比W(R) /D =0 .1～ 0 .5的 10组不同几何参数喷孔的试验研究得出了喷孔流量系数CD与流动参数和几何参数的关系。结果表明 :进口为圆角或倒角都可大幅度提高其流量系数 ,而 4 5°倒角孔在W/D>0 .1以后 ,流量系数CD对倒角比不敏感。推荐在设计喷油杆或喷油环喷孔时优先采用进口 4 5°倒角孔
Through the experimental study of 10 groups of different geometric parameters of the nozzle with the aspect ratio of L / D = 1.2 5 ~ 4.0 and the entrance angle (inverse angle) of W (R) / D = 0.1 ~ 0.5 The relation between the flow coefficient CD and the flow parameters and geometric parameters of the nozzle hole. The results show that the fillet or chamfer of the inlet can greatly improve the flow coefficient, while the flow coefficient CD is not sensitive to the chamfering ratio after W / D> 0. It is recommended to use imported 45 ° chamfered holes when designing the nozzle or injection hole