CAJ | 학술논문

用双流体模型和分区算法，气相多组分N_S方程和液相Euler方程分别用迎风TVD格式和NND格式进行数值求解，相间相互作用项方程用二阶Runge-Kutta法求解.并首次对H2引燃的CH4和煤油横向喷射、混合问题进行了数值研究.结果表明：与喷射加碘空气的PLIF结果相比，本文和实验结果符合得很好.对直通道，后面喷嘴的穿透深度大，煤油较气态燃料的穿透深度大，但难以被卷吸到喷嘴前的回流区内，流场出现无煤油区.H2和CH4均可扩散到回流区内，CH4和煤油引燃机理不同.对后台阶直通道，存在两个回流区，H2可扩散到这两个回流区，但CH4只能被卷吸到其喷嘴前的回流区.后台阶直通道增强混合的效果和引燃点火的可靠性更好.
용쌍류체모형화분구산법，기상다조분N_S방정화액상Euler방정분별용영풍TVD격식화NND격식진행수치구해，상간상호작용항방정용이계Runge-Kutta법구해.병수차대H2인연적CH4화매유횡향분사、혼합문제진행료수치연구.결과표명：여분사가전공기적PLIF결과상비，본문화실험결과부합득흔호.대직통도，후면분취적천투심도대，매유교기태연료적천투심도대，단난이피권흡도분취전적회류구내，류장출현무매유구.H2화CH4균가확산도회류구내，CH4화매유인연궤리불동.대후태계직통도，존재량개회류구，H2가확산도저량개회류구，단CH4지능피권흡도기분취전적회류구.후태계직통도증강혼합적효과화인연점화적가고성경호.
Two-fluid model and divisional computation techniques were used.The multi-species gas fully N-S equations were solved by upwind TVD scheme. Liquid phase equations were solved by NND scheme. The phases-interaction ODE equations were solved by 2nd Runge-Kutta approach. The favorable agreement is obtained between computational results and PLIF experimental results of iodized air injected into a supersonic flow. Then, the numerical studies were carried out on the mixing of CH4 and kerosene injected into a supersonic flow with H2 pilot injection. The results indicate that the penetration of kerosene approaches maximum when it is injected from the second injector. But the kerosene is less diffused compared with the gas fuels. The droplet free region appears in the flow-field. The mixing mechanism of CH4 with H2 pilot injection is different from that of kerosene. In the staged duct, H2 can be entrained into both recirculation zones produced by the step and injectors. But CH4 can only be carried into the recirculation between the injectors. Therefore, initiations of H2 and CH4 can occur in those regions. The staged duct is better in enhancing mixing and initiation with H2 pilot flame.