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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
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.
ZHAO Guozhu , SONG Wenyan , ZHANG Ruoling . Numerical Study on Thermal Cracking of RP-3 Aviation Kerosene Under Supercritical Pressure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(6) : 1513 -1521 . DOI: 10.7527/S1000-6893.2013.0547
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