Design criteria for film cooling for small liquid-propellant rocket engines.
Design criteria for film cooling for small liquid-propellant rocket engines.
复制标题
小型液体推进剂火箭发动机薄膜冷却的设计标准。
DOI：
10.2514/3.29545
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发表时间：
1969
影响因子：
1.6
通讯作者：
J. Stechman
中科院分区：
文献类型：
--
作者：
R. Stechman;J. Oberstone;J. Stechman
本文介绍了一项研究结果，该研究旨在确定薄膜冷却对使用地球储存、空间储存和低温推进剂组合的 10 至 1000 磅推力范围内的火箭发动机的适用性。使用四氧化二氮/单甲基肼和氟/单甲基肼（N2O4/MMH和F2/MMH）推进剂组合的测试数据验证了分析模型的准确性。提供的数据说明了混合比、比冲、壁温和薄膜冷却百分比的相互关系。研究表明，N2O4/MMH和C1F5/MMH以及其他类似的地球储存推进剂组合很容易适用于小型薄膜冷却航天器发动机。太空储存深低温系统 OF2/MMH、OF2/B2H6、OF2/CH4(LPG)、F2/MMH、O2/H2 和 F2/H2 如果要实现其潜在的高性能，则需要使用气膜冷却和高温材料。否则，系统必须在富含燃料的情况下运行，并进行高比例的油膜冷却，这将损害可提供的比冲和系统重量。例如，如果需要在 100-psia 腔室压力下运行的 100 磅推力 F2/H2 发动机，以在混合比为 8.0 或更大的情况下提供 400 秒 /sp，则腔室材料的最小薄膜冷却百分比和最低壁温能力必须分别为 40% 和 5000QF。
Results of a study to determine the applicability of film cooling to rocket engines in the 10to 1000-lb-thrust range using earth-storable, space-storable, and cryogenic propellant combinations are presented. The accuracy of the analytical model was verified with test data using the propellant combinations of nitrogen tetroxide/monomethylhydrazine and fluorine/monomethylhydrazine (N2O4/MMH and F2/MMH). Data are presented which illustrate the interrelational effects of mixture ratio, specific impulse, wall temperature, and the percent of film cooling. The studies show that N2O4/MMH and C1F5/MMH and other similar earth-storable propellant combinations are readily adaptable to small film-cooled spacecraft engines. The space-storable and deep-cryogenic systems OF2/MMH, OF2/B2H6, OF2/CH4(LPG's), F2/MMH, O2/H2, and F2/H2 will require the use of film cooling and high-temperature materials if the potentially high performance they possess is to be realized. Otherwise, the systems have to be operated fuel rich with high percentages of fuel film cooling, which will compromise the deliverable specific impulse and system weight. For example, if a 100-lb-thrust F2/H2 engine operating at 100-psia chamber pressure was needed to provide 400 sec of /sp at a mixture ratio of 8.0 or greater, the minimum percent of film cooling and minimum wall temperature capability of the chamber material must be 40% and 5000QF, respectively.