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arXiv 0811.0228math.APmath-phmath.MP
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定常势流管道跨音速激波解的唯一性

Uniqueness of Transonic Shock Solutions in a Duct for Steady Potential Flow

Gui-Qiang Chen, Hairong Yuan

摘要:

本文研究了定常势流条件下,管道中跨音速激波解的唯一性问题,这类激波解不一定是背景解的小扰动。本文证明了对于给定的均匀超声速直管道上游流,在管道出口处存在唯一的均匀压力,使得管道中存在唯一的跨音速激波解,该解是唯一的模平移。对于任意给定的均匀出口压力,管道内不存在跨音速激波解。这等价于在有界或无界管道中建立二阶偏微分方程自由边界问题的唯一性定理。证明是基于最大值/比较原理和一个明智的选择特殊的跨音速激波解决方案作为比较解决方案。

英文摘要:

We study the uniqueness of solutions with a transonic shock in a duct in a class of transonic shock solutions, which are not necessarily small perturbations of the background solution, for steady potential flow. We prove that, for given uniform supersonic upstream flow in a straight duct, there exists a unique uniform pressure at the exit of the duct such that a transonic shock solution exists in the duct, which is unique modulo translation. For any other given uniform pressure at the exit, there exists no transonic shock solution in the duct. This is equivalent to establishing a uniqueness theorem for a free boundary problem of a partial differential equation of second order in a bounded or unbounded duct. The proof is based on the maximum/comparison principle and a judicious choice of special transonic shock solutions as a comparison solution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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