Three-Dimensional Steady Supersonic Euler Flow Past a Concave Cornered Wedge with Lower Pressure at the Downstream

Three-Dimensional Steady Supersonic Euler Flow Past a Concave Cornered Wedge with Lower Pressure at the Downstream
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下游压力较低的凹角楔形三维稳态超音速欧拉流

DOI:
10.1007/s00205-017-1197-x
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发表时间:
2018-05
期刊:
Arch. Rational Mech. Anal.
影响因子:
--
通讯作者:
Wei Xiang
Wei Xiang
中科院分区:
其他
文献类型:
--
作者:
Aifang Qu;Wei Xiang

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本文研究了超声速流在下游低压下流过凹楔时产生的三维射流的稳定性。假设射流边界以外的气体是静态的。它可以表述为一个非线性双曲型自由边界问题在一个角落的区域有两个不同类型的特征自由边界:一个是稀疏波,而另一个是接触不连续,它可以是涡面或熵波。本文提出了一个更精确的论证,以证明在超音速来流和下游压力的扰动下,方形喷流结构的存在和稳定性。本文所提出的方法和技术对解决其它类似问题也有一定的帮助。
In this paper, we study the stability of the three-dimensional jet created by a supersonic flow past a concave cornered wedge with the lower pressure at the downstream. The gas beyond the jet boundary is assumed to be static. It can be formulated as a nonlinear hyperbolic free boundary problem in a cornered domain with two characteristic free boundaries of different types: one is the rarefaction wave, while the other one is the contact discontinuity, which can be either a vortex sheet or an entropy wave. A more delicate argument is developed to establish the existence and stability of the square jet structure under the perturbation of the supersonic incoming flow and the pressure at the downstream. The methods and techniques developed here are also helpful for other problems involving similar difficulties.
DOI: 10.1016/j.aim.2016.01.002
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影响因子: 1.7
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