CAJ | 학술논문

为了研究吸气式脉冲爆震发动机缓燃向爆震转变（ deflagration to detonation transition，简称DDT）过程的特性，以丙烷和空气为燃料，对吸气式无阀脉冲爆震发动机的DDT过程进行二维数值模拟，并研究了点火能量和点火源数目对DDT过程的影响，分析了点火能量不同导致DDT过程差异的原因。数值模拟结果表明，在DDT过程中，激波以及反射激波的相互作用在爆震波的起爆方面起主导作用；在所模拟的小点火能量范围内，点火能量越高，DDT时间越短，但DDT距离却变化不大；在总点火能量一致的情况下，采用双点火源点火能够缩短DDT距离。
위료연구흡기식맥충폭진발동궤완연향폭진전변（ deflagration to detonation transition，간칭DDT）과정적특성，이병완화공기위연료，대흡기식무벌맥충폭진발동궤적DDT과정진행이유수치모의，병연구료점화능량화점화원수목대DDT과정적영향，분석료점화능량불동도치DDT과정차이적원인。수치모의결과표명，재DDT과정중，격파이급반사격파적상호작용재폭진파적기폭방면기주도작용；재소모의적소점화능량범위내，점화능량월고，DDT시간월단，단DDT거리각변화불대；재총점화능량일치적정황하，채용쌍점화원점화능구축단DDT거리。
In order to investigate the flow characteristics of the DDT process in an air-breathing pulse detonation en-gine, two dimensional numerical simulation of the DDT process in a valveless air-breathing pulse detonation engine was carried out. The spark energy and the spark number were varied to investigate their effects on the DDT process. The mechanism that causes the difference in DDT process for different spark energies was analyzed. The simulation results indicated that:(1) The shock wave and reflected shock wave from the obstacles are the main reason that leads to the DDT;(2) the time of the DDT process decreases with increasing spark energy for the range of spark energy involved, but the length of the DDT remains almost the same; (3) when dual ignition sources were used, the length of the DDT was reduced compared with single ignition source of the same total spark energy.