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首页> 外文会议>Fluids Engineering Conference Vol.2 Pt.D >FLOW CHARACTERISTICS OF ROUND JET ISSUING INTO COUNTER-FLOWING UNIFORM STREAM
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FLOW CHARACTERISTICS OF ROUND JET ISSUING INTO COUNTER-FLOWING UNIFORM STREAM

机译：圆射流流入逆流均匀流的流动特性

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摘要

Two-color four beam LDV measurements were conducted for the round jet issuing into a counter-flowing uniform stream under well controlled boundary conditions. A comprehensive set of the velocity data was documented for velocity ratios from 0.8 to 7. The linear dependence of jet penetration length on velocity ratio was confirmed for all conditions investigated, including those with velocity ratios less than 1. The proportional coefficient estimated is substantially larger than those reported for similar jets in a water channel. The streamwise variations of mean velocity and turbulence intensity on the jet axis also depend only on velocity ratio. It is very interesting to know that the streamwise turbulence intensity on the jet axis, non-dimensionalized by uniform velocity, is at a maximum near at the stagnation point and that the maximum has a constant value near 1 for velocity-ratios greater than 2. The static pressure was found to become near to zero at the stagnation point and is negative in the core of the recirculation region.
机译：进行了两色四光束LDV测量，以在控制良好的边界条件下将圆形射流喷射成逆流均匀流。记录了速度比从0.8到7的一组完整的速度数据。在研究的所有条件下，包括速度比小于1的条件下，都证实了射流穿透长度对速度比的线性依赖性。估计的比例系数明显更大比那些在水道中使用类似喷射器的报道。射流轴上平均速度和湍流强度的沿河方向变化也仅取决于速度比。非常有趣的是，在射流轴上的湍流强度（没有用均匀速度进行量纲化）在停滞点处最大，并且对于速度比大于2的情况，最大值具有接近1的恒定值。发现静压在停滞点接近于零，并且在再循环区域的核心处为负。

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