不对称撞击流的实验研究与数值模拟

Experimental research and numerical simulation of asymmetric impinging streams

采用恒温式热线风速仪(CTA)测量不对称撞击流流场.用CFD软件对流场进行数值模拟,得到了和实验相吻合的结果.结果表明,不对称撞击流轴线上轴向速度除撞击面附近外,基本符合圆射流衰减规律.当喷嘴间距一定时,轴线撞击面驻点偏移量随气速比和喷嘴直径的增大而增大.当气速比一定时,轴线撞击面驻点偏移量随喷嘴间距增大而增大.

The characteristics of asymmetric impinging streams were measured with hot wire anemometry and simulated with CFD. The results of numerical simulation were consistent with the results of experiments. The characteristics of axial velocity of asymmetric impinge streams were similar with those of free round jet except in the vicinity of the impinging face. When the distance of two nozzles was fixed, the offset of impinging stagnation point on the axis increased with the ratio of velocity and the nozzle diameter. When the ratio of velocity was fixed, the offset of impinging stagnation point on the axis increased with the distance of two nozzles.