角度和孔间距对双向扩张型孔流量系数影响的实验

为了研究非常规扩张孔的流动特性,测量了一排7个双向扩张孔的平均流量系数.气膜孔的前倾角为20°,45°和90°,径向角为0°,30°和65°,孔间距与孔径比为2,3和4.动量比变化范围为1到8.结果表明,径向角为0°的流量系数随前倾角的增加显著增加.前倾角为20°的流量系数随径向角的增加略有减小.前倾角为90°的流量系数随孔间距的增加而增加.

Influence of angles and hole pitches on discharge coefficients of expanded holes at inlet and outlet

This paper presented discharge coefficients of the expanded holes at inlet and outlet with plane angles of 20°,45°,90°,radial angles of 0°,30°,65° and the ratios of pitch to diameter of 2,3,4.The momentum flux ratios varied in the range from 1 to 8.The results show that discharge coefficients of radial angle =0° increase significantly when the plane angles increase from 20° to 90°.The effect of plane angle becomes weak with the increasing radial angles.Radial angles have weak influence on the discharge coefficients of plane angle=20° and discharges coefficients of plane angle=45°and plane angle=90° decreases when the radial angles increase from 0° to 65°.Discharge coefficients of plane angle=90°increase when the ratios of hole pitch to the diameter increase from 2 to 4.