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Analysis on stationary window of oblique detonation wave in methane-air mixture

机译：甲烷 - 空气混合物斜爆波固定窗口分析

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摘要

In order to obtain the standing conditions and stationary range of oblique detonation wave in methane-air combustible mixture, we use the Newton-Raphson iteration method to solve the perfect gas flow conservation equations of oblique detonation wave based on detonation theory. We investigate the variation laws of the oblique detonation stationary window and internal mechanism under different methane-air equivalence ratio, incoming flow velocity, initial pressure and initial temperature. The oblique detonation polar curve can be separated into three sections, each of which has different flow characteristics corresponding to different wave morphology. Among them, a stationary oblique detonation wave can be formed when the wedge angle is larger than the wedge angle of Chapman-Jouguet state oblique detonation wave, and smaller than the maximum wedge angle corresponding to the oblique detonation wave without detached. The wedge angle range is called the stationary window of the oblique detonation wave. We found that the oblique detonation is more easily formed when the methane-air mixture is under the oxygen-enriched condition, and the range of oblique detonation wave stationary window becomes larger as the incoming velocity increases. The changes of initial pressure and temperature have little influence on the stationary window. The change law of the stationary window of oblique detonation wave corresponds to the change law of Mach number behind CJ oblique detonation wave. In addition, the standing conditions are mainly related to the coupling of the incoming mixture kinetic energy and heat release. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：为了获得甲烷空气可燃混合物中倾斜爆震波的稳定条件和静止范围，我们使用牛顿 - 拉赛迭代方法来解决基于爆轰理论的倾斜爆炸波的完美气体流动节约方程。我们研究了不同甲烷 - 空气等效比下倾斜爆震静止窗口和内部机制的变异规律，进入的流速，初始压力和初始温度。倾斜爆震极性曲线可以分成三个部分，每个部分具有与不同波形形态相对应的不同流动特性。其中，当楔角大于查曼-Jouguet状态倾斜爆炸波的楔角时，可以形成静止倾斜爆震波，并且小于对应于倾斜爆震波的最大楔角而不分离。楔角范围称为倾斜爆震波的固定窗口。我们发现，当甲烷 - 空气混合物处于富氧条件下，更容易形成倾斜爆震，并且随着进入的速度增加，倾斜爆震波固定窗的范围变大。初始压力和温度的变化对固定窗口没有影响。倾斜爆震波静止窗口的变化规律对应于CJ斜爆震波后面的马赫数的变化规律。此外，常设条件主要与进入的混合物动能和热释放的偶联有关。 （c）2021 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2021年第11期|107038.1-107038.11|共11页
  • 作者

    Guo Hongbo; Zhao Ningbo; Yang Honglei; Li Shuying; Zheng Hongtao;

  • 作者单位

    Harbin Engn Univ Coll Power & Energy Engn Harbin 150001 Peoples R China;

    Harbin Engn Univ Coll Power & Energy Engn Harbin 150001 Peoples R China;

    Harbin Engn Univ Coll Power & Energy Engn Harbin 150001 Peoples R China;

    Harbin Engn Univ Coll Power & Energy Engn Harbin 150001 Peoples R China;

    Harbin Engn Univ Coll Power & Energy Engn Harbin 150001 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Oblique detonation wave; Methane-air; Polar curve; Stationary window;

    机译：斜爆波;甲烷 - 空气;极曲线;固定窗口;

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