超临界压力下RP-3航空煤油吸热裂解反应的数值研究
收稿日期: 2013-07-22
修回日期: 2014-02-20
网络出版日期: 2014-03-07
Numerical Study on Thermal Cracking of RP-3 Aviation Kerosene Under Supercritical Pressure
Received date: 2013-07-22
Revised date: 2014-02-20
Online published: 2014-03-07
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。
赵国柱 , 宋文艳 , 张若凌 . 超临界压力下RP-3航空煤油吸热裂解反应的数值研究[J]. 航空学报, 2014 , 35(6) : 1513 -1521 . DOI: 10.7527/S1000-6893.2013.0547
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.
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