航空学报 > 2014, Vol. 35 Issue (6): 1513-1521   doi: 10.7527/S1000-6893.2013.0547

超临界压力下RP-3航空煤油吸热裂解反应的数值研究

赵国柱1, 宋文艳1, 张若凌2   

  1. 1. 西北工业大学 动力与能源学院, 陕西 西安 710072;
    2. 中国空气动力研究与发展中心 高超声速冲压发动机技术重点实验室, 四川 绵阳 621000
  • 收稿日期:2013-07-22 修回日期:2014-02-20 出版日期:2014-06-25 发布日期:2014-03-07
  • 通讯作者: 宋文艳,Tel.:029-88494852 E-mail:wenyan_song@nwpu.edu.cn E-mail:wenyan_song@nwpu.edu.cn
  • 作者简介:赵国柱男,博士研究生。主要研究方向:超燃冲压发动机热防护。 E-mail:dfer-long@163.com;宋文艳女,教授,博士生导师。主要研究方向:超燃冲压发动机总体性能研究。Tel:029-88494852 E-mail:wenyan_song@nwpu.edu.cn;张若凌男,博士,研究员。主要研究方向:超燃冲压发动机热防护。Tel:0816-2466394 E-mail:zhangruoling@cardc.cn

Numerical Study on Thermal Cracking of RP-3 Aviation Kerosene Under Supercritical Pressure

ZHAO Guozhu1, SONG Wenyan1, ZHANG Ruoling2   

  1. 1. College of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China;
    2. Science and Technology Laboratory on Scramjet, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2013-07-22 Revised:2014-02-20 Online:2014-06-25 Published:2014-03-07

摘要:

为深入理解主动冷却过程中碳氢燃料的超临界吸热裂解特性,采用RP-3航空煤油的四组分替代模型、包含18种组分和24步反应的改进Kumar-Kunzru裂解反应动力学模型,对压力为5 MPa时管道内RP-3的吸热裂解反应过程进行了数值模拟,研究了裂解反应对燃料物性和传热特性的影响,以及裂解率较高时二次反应对RP-3裂解的影响。结果表明:温度达到890 K时,RP-3的裂解率超过20%,其中芳烃占裂解产物的12.1%;RP-3裂解后燃料物性显著变化,管道出口壁温和燃料温度分别降低了130 K和129 K,努塞尔数提高了16.5%,传热效率显著提高;裂解率较高时二次反应对RP-3裂解的影响较大,相比不考虑二次反应的状态,带二次反应时RP-3裂解率减小了29.1%,管道出口壁温和燃料温度分别降低了34 K和22 K。

关键词: 超临界压力, RP-3航空煤油, 吸热裂解, 二次反应, 再生冷却

Abstract:

In order to understand the thermal cracking characteristic of hydrocarbon fuel under supercritical pressure in the regenerative cooling progress, a numerical study on the thermal cracking of RP-3 aviation kerosene under 5 MPa is conducted based on a four-species surrogate model of RP-3. A modified Kumar-Kunzru model consisting of 18 species and 24 reactions is used to simulate the cracking process. The effect of thermal cracking on the thermophysical properties and heat transfer of the fluid is investigated. The effect of secondary reactions on the thermal cracking of RP-3 aviation kerosene is also studied at high conversion of RP-3. Numerical results show that the conversion of RP-3 is higher than 20% with a relative proportion of aromatics of 12.1% once the fluid temperature reaches 890 K. The thermophysical properties of the fluid change obviously when the thermal cracking of RP-3 occurs. The wall temperature and fluid temperature decrease by 130 K and 129 K respectively at the tube outlet. Meanwhile, the Nusselt number increases by 16.5%, indicating that the heat transfer is enhanced. The secondary reactions affect the thermal cracking of RP-3 obviously at high conversion. It is found that the conversion of RP-3 with secondary reactions is 29.1% lower than that without secondary reactions. Meanwhile, the wall temperature and fluid temperature decrease by 34 K and 22 K respectively at the tube outlet.

Key words: supercritical pressure, RP-3 aviation kerosene, thermal cracking, secondary reaction, regenerative cooling

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