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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >A Conservation-Law Approach to Predicting the Length of the Boundary Layer Transition Region
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A Conservation-Law Approach to Predicting the Length of the Boundary Layer Transition Region

机译：守恒律法预测边界层过渡区的长度

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摘要

The length of the boundary layer transition region is predicted by the conservation of momentum, based on the prediction method of the boundary layer transition by the mass conservation. The predicted length decreased in line with wall cooling and an increase of Mach number. Some calculated lengths agreed with experimental results, and others did not. To examine the insufficient agreement, the effect of the wall temperature on the length is discussed. Under the heated-upstream wall condition, which may appear in hypersonic wind tunnel experiments, the length of the transition region and the transition Reynolds number increased in line with the wall cooling in the prediction calculation. Most of the experimental data are in the region between the calculated results with this heated-upstream wall condition and those with the uniform wall-temperature condition. The similarity of the results predicted by the energy conservation to those predicted by the momentum conservation is also discussed.
机译：基于通过质量守恒的边界层过渡的预测方法，通过动量守恒来预测边界层过渡区域的长度。预测的长度随着壁冷却和马赫数的增加而减小。一些计算出的长度与实验结果相符，而另一些则不同。为了检验不充分的一致性，讨论了壁温对长度的影响。在高超声速风洞实验中可能出现的上游加热壁条件下，过渡区的长度和过渡雷诺数随预测计算中壁冷的增加而增加。大多数实验数据都在这种加热的上游壁面条件与均匀壁温条件下的计算结果之间。还讨论了能量守恒所预测的结果与动量守恒所预测的结果的相似性。

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