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An Approach to Analysing Erosive Characteristics of Two-Channel Combustion Chambers

机译：分析两通道燃烧室侵蚀特性的一种方法

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摘要

To acquire the erosive characteristics of two-channel combustion chambers, a quasi-one-dimensional internal ballistics model is proposed. Combining the model with two different erosive burning models, the modified L-R expression, and the Mukunda-Paul expression, the flow parameters and the internal ballistics performance of a test solid rocket motor are computed. The results show good agreement with experimental data. According to the results, the more severe the erosion is, the earlier, longer, and gentler the tail-off stage becomes. During the tail-off stage, the dramatic drop of pressure leads to a low normal burning rate and makes it easier for erosion burning to occur. For this reason, notable erosive burning might appear during tail-off if the case-to-throat area ratio is extremely low. The results also show that flows in the inner channel and the outer channel are similar but not identical. This leads to different erosive burning behaviours in the two channels. Also, the two erosive burning rate models involved in this paper are compared. It seems that the M-P expression provides better results than the modified L-R expression does, since it reveals the threshold phenomena. Besides, the M-P expression has great advantages for its universality for most propellants and different SRM geometries.
机译：为了获得两通道燃烧室的侵蚀特性，提出了准一维内部弹道模型。将模型与两个不同的侵蚀性燃烧模型（修改后的L-R表达式和Mukunda-Paul表达式）相结合，可以计算出固体火箭发动机的流量参数和内部弹道性能。结果表明与实验数据吻合良好。根据结果​​，侵蚀越严重，拖尾阶段变得越早，越长且越温和。在尾气阶段，压力的急剧下降会导致正常燃烧速率降低，并使腐蚀燃烧更容易发生。因此，如果机壳与喉管的面积比极低，则在尾流期间可能会出现明显的侵蚀性燃烧。结果还表明，内部通道和外部通道中的流量相似但不相同。这导致两个通道中的侵蚀性燃烧行为不同。此外，比较了本文涉及的两种侵蚀燃烧速率模型。看起来M-P表达提供了比修饰的L-R表达更好的结果，因为它揭示了阈值现象。此外，M-P表达式对于大多数推进剂和不同的SRM几何形状具有通用性，因此具有很大的优势。

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  • 来源
    《International journal of aerospace engineering》 |2019年第2期|2974537.1-2974537.9|共9页
  • 作者

    Ma Yanjie; Bao Futing; Hui Weihua; Liu Yang; Wei Ran;

  • 作者单位

    Northwestern Polytech Univ, Sci & Technol Combust Internal Flow & Thermostruc, Xian 710072, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, Sci & Technol Combust Internal Flow & Thermostruc, Xian 710072, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, Sci & Technol Combust Internal Flow & Thermostruc, Xian 710072, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, Sci & Technol Combust Internal Flow & Thermostruc, Xian 710072, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, Sci & Technol Combust Internal Flow & Thermostruc, Xian 710072, Shaanxi, Peoples R China;

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