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首页> 外文期刊>The Aeronautical Journal >Studies on high speed jets from nozzles with internal grooves
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Studies on high speed jets from nozzles with internal grooves

机译：带内槽喷嘴的高速射流研究

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Experiments were carried out on jets issuing from circular nozzles with grooved exits and the results compared with those of the plain nozzle. The plain nozzle had an exit diameter of 10 mm. Because of the introduction of semi-circular grooves at the exit, the effective or equivalent diameter of the grooved nozzles was 10-44mm. The groove lengths were varied as 3, 5 and 8mm. The nozzles were operated at fully expanded sonic and underexpanded exit conditions. The corresponding fully expanded Mach numbers were 1.0 and 141. The shock cell structure of the underexpanded jets from grooved nozzles appeared to be weaker than that of the plain nozzle, as indicated by lesser amplitudes of the cyclic variation of the Pitot pressure. The iso-Mach contours indicate that the jet spread along the grooved plane is significantly higher than that along the ungrooved plane. Off-centre peaks were observed in the mean pressure profile of underexpanded jets from grooved nozzles. They were probably due to the streamwise vortices shed from the grooves.
机译：对从带有开槽出口的圆形喷嘴发出的射流进行了实验，并将结果与​​普通喷嘴进行了比较。普通喷嘴的出口直径为10毫米。由于在出口处引入了半圆形凹槽，带凹槽的喷嘴的有效直径或等效直径为10-44mm。凹槽长度分别为3、5和8mm。喷嘴在完全膨胀的声波和膨胀不足的出口条件下运行。相应的完全膨胀马赫数分别为1.0和141。沟槽式喷嘴的膨胀不足射流的冲击单元结构似乎比普通喷嘴的冲击单元结构弱，如皮托压力的周期性变化幅度较小。 iso-Mach等高线轮廓表明，沿着带凹槽的平面传播的射流明显高于没有带凹槽的平面的射流。在槽式喷嘴的膨胀不足的喷嘴的平均压力曲线中观察到偏心峰。它们可能是由于从凹槽中流下的旋涡所致。

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