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Investigation of Inclined Porous Transpiration-Cooled Struts

机译：倾斜的多孔蒸腾冷却支柱的研究

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摘要

Struts are used to inject fuel into the core region of scramjet combustion chambers for enhanced combustion. An inclined porous transpiration-cooled strut was designed and tested in a wind tunnel with a Mach number of 2.5, a total temperature of 1774 K, and a duration of 50 s. Five thermocouples were welded on the bottom of the strut to monitor the temperature variations. Methane was injected into the porous strut as coolant at a pressure of 3.4 MPa and blowing ratio of 2.8%; the highest measured temperature on the bottom of the strut was approximately 475 K. RP3 aviation kerosene was injected into the porous strut through six 0.4-mm-diam injection holes at a pressure of 3.0 MPa and total blowing ratio of 12.2%. The strut was adequately protected by transpiration cooling with no obvious oxidation observed on the strut surface after the test. The simulation results correspond reasonably with experimental data, which demonstrate that the highest temperature on the strut is approximately 920 K, using methane as the coolant. As intended, the methane formed a protective film around the strut, reducing heat transfer and strut temperature at thermal equilibrium.
机译：支柱用于将燃料喷入超燃冲压燃烧室的核心区域，以增强燃烧效果。在马赫数为2.5，总温度为1774 K，持续时间为50 s的风洞中设计并测试了倾斜的多孔蒸腾冷却支柱。在支柱的底部焊接了五个热电偶，以监视温度变化。在压力为3.4 MPa，吹塑率为2.8％时，将甲烷作为冷却剂注入多孔支柱。支撑杆底部的最高实测温度约为475K。RP3航空煤油通过六个直径为0.4 mm的注入孔以3.0 MPa的压力和12.2％的总吹塑比注入多孔支撑杆。测试后，通过蒸腾冷却对支柱进行了充分的保护，在支柱表面未观察到明显的氧化。仿真结果与实验数据合理地吻合，实验数据表明，使用甲烷作为冷却剂，支撑杆上的最高温度约为920K。按照预期，甲烷在支撑杆周围形成了保护膜，从而降低了热平衡时的传热和支撑杆温度。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2018年第3期|660-668|共9页
  • 作者

    Huang G.; Zhu Y. H.; Jiang P. X.; Huang Z.;

  • 作者单位

    Tsinghua Univ, Minist Educ, Key Lab Thermal Sci & Power Engn, Dept Thermal Engn, Beijing 10084, Peoples R China;

    Tsinghua Univ, Minist Educ, Key Lab Thermal Sci & Power Engn, Dept Thermal Engn, Beijing 10084, Peoples R China;

    Tsinghua Univ, Minist Educ, Key Lab Thermal Sci & Power Engn, Dept Thermal Engn, Beijing 10084, Peoples R China;

    Tsinghua Univ, Minist Educ, Key Lab Thermal Sci & Power Engn, Beijing 10084, 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
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