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A droplet/wall impact model and simulation of a bipropellant rocket engine

机译：液滴/墙体冲击模型和跨玻璃卷火箭发动机的仿真

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摘要

Droplet impact on a solid wall contributes to droplet vaporization and cooling on the inner wall. A new droplet/wall impact model is developed and fitted from the experimental data, which takes both kinematic parameters of the impinging droplets and thermal parameters of the solid wall into consideration. The model describes the behavior of droplets after impact and identifies five representative regimes, i.e., stick/spread, suspend, rebound, boiling including breakup, and splash, through the critical Weber number of droplets and wall temperature. To assess the new model, numerical simulations were performed of propellant droplets impacting the wall of a bipropellant rocket engine chamber. A comparison with experimental data shows better predictions of the wall temperature of the chamber than obtained from previous models. A larger number of large-sized monomethylhydrazine and nitrogen tetroxide droplets in the boiling induced breakup and splash regimes break into smaller droplets when using the new model. There are also temperature peaks near the impact points and near the throat. Especially in the throat of the combustion chamber, the new model predicts the wall temperature distribution accurately, offering improved prediction of the combustion chamber and assessing thermal protection of the throat. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：对固体壁上的液滴冲击有助于液滴蒸发和内壁上的冷却。开发了一种新的液滴/墙体冲击模型，并从实验数据中开发并安装了撞击液滴的运动参数和实心壁的热参数。该模型描述了液滴后液滴的行为，并识别五个代表性制度，即粘附/涂抹，悬挂，反弹，沸腾，包括分解，并飞溅，并通过临界杂志和墙壁温度。为了评估新模型，对撞击覆盖壁的壁的推进剂液滴进行数值模拟。与实验数据的比较显示了比以前模型所获得的腔室的壁温的更好预测。在使用新模型时，沸腾诱导的分离中的大量大尺寸的单甲基肼和氮氧化物液滴和飞溅制度在较小的液滴中破裂。在冲击点附近也有温度峰值，喉部附近。特别是在燃烧室的喉部中，新模型精确地预测了壁温分布，提供了改进的燃烧室预测并评估喉部的热保护。 （c）2019年Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2019年第5期|32-39|共8页
  • 作者

    Fu Pengfei; Hou Lingyun; Ren Zhuyin; Zhang Zhen; Mao Xiaofang; Yu Yusong;

  • 作者单位

    Tsinghua Univ Sch Aerosp Engn Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Aerosp Engn Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Aerosp Engn Beijing 100084 Peoples R China;

    Beijing Inst Control Engn Beijing 100190 Peoples R China;

    Beijing Inst Control Engn Beijing 100190 Peoples R China;

    Beijing Jiaotong Univ Beijing 100044 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

    Droplet/wall impact; Bipropellant; Liquid rocket engine;

    机译：液滴/墙面撞击;双链液;液体火箭发动机;

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