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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Laminar-flow design for a Mach-6 quiet-flow wind tunnel nozzle
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Laminar-flow design for a Mach-6 quiet-flow wind tunnel nozzle

机译：Mach-6静流风洞喷嘴的层流设计

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A high Reynolds-number Mach-6 wind-tunnel nozzle has been designed for a new quiet-flow Ludwieg tube. The quiet-flow nozzle is designed to maintain laminar boundary layers on the nozzle walls as far downstream as possible. Transition onset is estimated using the e(N) method. A very long nozzle with gentle curvature is used to reduce Gortler instability. Early transition would occur in adiabatic nozzles of this type, due to the first-mode TS instability, The first mode is controlled with an isothermal wall temperature that is high near the throat and tapers to ambient near the exit. The crossflow instability is eliminated through use of an axisymmetric nozzle. The e(N) method predicts that a quiet-flow Reynolds number in excess of 13 million can be achieved in a prototype nozzle that is 2.61 m (103 inch) long and 0.23 m (9 inch) in diameter, at 10 atm, (1.03 x 10(6) Pa) total pressure. This performance would be about twice that of the existing Langley Mach-6 quiet-now nozzle, At the same pressure, a nozzle that is 10 m (33 ft) long and 0.61 m (24 in.) in diameter is predicted to have a quiet Reynolds number of more than 36 million, a value sufficient to allow reproducing many flight experiments. [References: 45]
机译：高雷诺数Mach-6风洞喷嘴已设计用于新型静流Ludwieg管。静流喷嘴的设计目的是在喷嘴壁上尽可能保持下游的层状边界层。使用e（N）方法估计过渡开始时间。使用非常长的曲率柔和的喷嘴可减少Gortler的不稳定性。由于第一模式TS的不稳定性，这种绝热喷嘴将发生早期过渡。第一模式是通过等温壁温控制的，该等温壁温在喉部附近较高，在出口附近逐渐减小至环境温度。通过使用轴对称喷嘴消除了横流不稳定性。 e（N）方法预测，在10个大气压下，长2.61 m（103英寸），直径0.23 m（9英寸）的原型喷嘴中可以实现超过1300万的静流雷诺数（ 1.03 x 10（6）Pa）总压力。该性能将是现有Langley Mach-6静音喷嘴的两倍。在相同压力下，预计长10 m（33 ft）和直径0.61 m（24 in。）的喷嘴具有安静的雷诺数超过3600万，这一价值足以重现许多飞行实验。 [参考：45]

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