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首页> 外文期刊>International Journal of Heat and Mass Transfer >Mixing due to a heated elliptic air jet
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Mixing due to a heated elliptic air jet

机译：由于加热的椭圆形空气射流而混合

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摘要

This paper presents measurements of velocity and temperature for a contoured contraction nozzle elliptic air jet with a 2:1 aspect ratio issuing into stagnant unconfined surroundings. Initial conditions at the jet nozzle exit plane were laminar. All measurements of mean and root-mean-square (RMS) velocities and temperatures were carried out using hot-wire and cold-wire anemometers. Flow development was found to be more rapid in the minor axis than major axis due to the thinner initial boundary layer momentum thickness in the minor axis plane. This is clearly demonstrated by the rapid growth of the jet width in the minor axis (compared to the major axis) in the near-field of the jet. Self-similarity in the mean velocity and temperature profiles was attained relatively early. However, RMS quantities have not become self-similar even by the streamwise distance of 38 equivalent jet nozzle diameters (D_e). One axis-switchover due to the initial difference in jet-width growth rates in the two axes was detected in the current jet. The rates of centerline temperature decay, temperature half-width growths and peak RMS temperatures at all measurement locations were consistently higher than their velocity counterparts. The temperature spreading rate in the major axis was found to be significantly larger vis-a-vis that of velocity, possibly due to the minima in radius of curvature of the elliptic geometry. All the results presented suggest that the use of heated elliptic jets could offer enhanced mixing performance in relevant applications.
机译：本文介绍了轮廓比为2：1的椭圆形椭圆形喷嘴向停滞的无限制环境中的速度和温度的测量结果。喷嘴出口平面的初始条件是层流的。均值和均方根（RMS）速度和温度的所有测量均使用热线和冷线风速计进行。由于短轴平面中的初始边界层动量厚度较薄，因此在短轴上的流动发展比长轴更快。射流的宽度在射流近场中沿短轴（与长轴相比）的快速增长清楚地证明了这一点。平均速度和温度曲线的自相似性相对较早地实现。但是，即使在38个等效喷嘴直径（D_e）的流向距离上，RMS量也不会变得自相似。在当前喷嘴中检测到由于两个轴的喷嘴宽度增长率的初始差异而导致的一个轴切换。在所有测量位置，中心线温度衰减率，温度半宽度增长率和RMS峰值温度始终高于其速度对应值。发现主轴上的温度分布速率相对于速度而言明显更大，这可能是由于椭圆几何形状的曲率半径最小所致。提出的所有结果表明，使用加热的椭圆形喷嘴可以在相关应用中提供增强的混合性能。

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