Numerical simulation of DDT process of aviation kerosene one-component alternative fuel

航空煤油单组分替代燃料DDT过程数值模拟

School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China

Received: 8 September 2021

Abstract

Aiming at the difficulty of numerical simulation of the DDT process during the detonation combustion of aviation kerosene, this paper has presented a single-component simplified mechanism of aviation kerosene to carry out the numerical simulation of the DDT detonation process. By simplifying the detailed mechanism of n-decane, the simplified mechanism of RP-3 aviation kerosene single-component alternative fuel was obtained, and the DDT process of aviation kerosene was numerically simulated, and the influence law of the obstacle blocking ratio and arrangement mode on the DDT process was analyzed. The results show that the simplified mechanism model for the single-component alternative fuel can better fit the combustion characteristics of aviation kerosene under high temperature and pressure. The numerical simulation results of the DDT process are analyzed, and it is found that the DDT time will increase with the increasing of blocking ratio. The DDT time at the same blocking ratio is shorter when the obstacles are symmetrically distributed.

摘要

针对航空煤油的爆震燃烧时DDT过程数值模拟难度大的问题, 确定了一种航空煤油单组分简化机理进行DDT爆震过程的数值模拟。通过简化正癸烷详细机理得到RP-3航空煤油单组分替代燃料简化机理, 并对航空煤油DDT过程进行了数值模拟, 分析了障碍物阻塞比和排列方式对DDT过程的影响规律。结果表明, 该单组分替代燃料简化机理模型能在高温高压情况下较好地拟合航空煤油的燃烧特性。对DDT过程的数值模拟结果进行分析, 发现DDT时间会随着阻塞比增大而增大; 在相同阻塞比时, 障碍物交错排列的情况DDT时间更短。