free stream meaning in Chinese

自由怜
自由流
自由气流

The equal density and pressure of free streams are chosen to study the effect of compressibility on the mixing layer
计算选取来流密度和压力相等，对流马赫数从0 . 2到1 . 2 ，以研究压缩性对混合层流动的影响。
The pressure model of flush airdata sensing system is nonlinear equations of the angle of attack , angle of sideslip , dynamic pressure and static pressure of the free stream
飞行器表面的压力分布是大气数据(迎角、侧滑角、动压、静压)的非线性函数,这个函数主要可以从空气动力学模型得到。
About numerical simulations , at first the numerical results were compared with the experimental data published by nasa to prove the feasibility of the numerical method on the simulation of scramjet nozzle in hypersonic free stream
数值仿真方面:首先,本文通过与nasa的试验数据对比,验证了该仿真方法运用于超燃冲压发动机流场计算的可行性。
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