On transonic shocks in a conic divergent nozzle with axi-symmetric exit pressures

On transonic shocks in a conic divergent nozzle with axi-symmetric exit pressures
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具有轴对称出口压力的圆锥发散喷嘴中的跨音速激波

DOI:
10.1016/j.jde.2009.09.017
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发表时间:
2010-02
影响因子:
2.4
通讯作者:
李军
李军
中科院分区:
数学2区
文献类型:
--
作者:
辛周平;尹会成;李军

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在本文中,我们建立了当给定的可变轴对称出口压力在合适的范围内时,一类具有圆锥发散部分的拉瓦尔喷嘴中全稳态可压缩欧拉系统的3-D跨音速激波解的存在性和稳定性。因此,对于这类喷嘴,我们在[8]第147节中解决了Courant和Friedrichs(1948)描述的轴对称情况下的跨音速激波问题:给定适当大的出口压力pe(x),如果喷嘴喉部后面的上游气流仍然是超音速的,那么在喷嘴发散部分的某个位置,激波前沿介入,气体被压缩并减速到 亚音速,从而自动调节激波锋的位置和强度,使得出口端压力变为pe(x)。
In this paper, we establish the existence and stability of a 3-D transonic shock solution to the full steady compressible Euler system in a class of de Laval nozzles with a conic divergent part when a given variable axi-symmetric exit pressure lies in a suitable scope. Thus, for this class of nozzles, we have solved such a transonic shock problem in the axi-symmetric case described by Courant and Friedrichs (1948) in Section 147 of [8]: Given the appropriately large exit pressure pe(x), if the upstream flow is still supersonic behind the throat of the nozzle, then at a certain place in the diverging part of the nozzle a shock front intervenes and the gas is compressed and slowed down to subsonic speed so that the position and the strength of the shock front are automatically adjusted such that the end pressure at the exit becomes pe(x).
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