孔板后台阶流动与钝化诊断中测压位置寻优

Backward-Facing Step Flow of Orifice Plate and Pressure Measuring Location Optimization in Bluntness Diagnosis

针对孔板下游流场的后台阶流动问题进行了仿真研究,可知当雷诺数大于10,000后,其旋涡回流区长度固定,并且由仿真实验可以得到回流区长度数据.对于因孔板迎流面直角边磨损钝化造成的畸变流场,可用差压比值算法进行流场畸变量即钝化量诊断与测量值校正,但测压点位置寻优的实验方法采用凑试法,效率低、不具有通用性,故将旋涡稳定性用于测压点位置寻优研究中,得到了诊断算法测压点优化经验数据,实验证明其提高了寻优效率并具有通用性,同时也适用于其他类似情况.

In view of the backward-facing step flow of orifice plate flow field,simulation study was conducted and it was validated that the length of recirculation region could be fixed and length data could be obtained when Re is greater than 10,000.The right angle of inlet edge of orifice is often blunt because of abrading,and the bluntness can be diagnosed by differential pressure ratio factor.But experiment method has been employed to optimize the pressure points of diagnosis algorithm,which has low efficiency and lacks versatility.So vortex stability was introduced to optimization study.The experience data of pressure points optimization was gained and experimental results show the efficiency and generality of the method.At the same time,this method can also be applied to optimization diagnosis algorithm of other abnormal conditions of orifice plate.