超音速燃燒衝壓引擎是一種有高技術難度的推進系統，其運作的環境通常為空氣密度較稀薄的流場，在這種情況下巨觀的連續流體的假設基礎呈顯薄弱，需改用微觀的粒子流體模型的觀點進行分析，本文使用直接模擬蒙地卡羅法(DSMC)，此法是目前較為被廣用於模擬分析粒子運動行為模式的方法。 由於超音速燃燒衝壓引擎運作於較高飛行馬赫數的環境，因此當自由流進入內流場時仍保持較高的動量，此時如何讓燃料與空氣可以在此環境下混合良好便成了一個重要的課題，混合情況的好壞直接影響燃燒品質，這也將與其產生的推力有直接的關係，因此本文對不同引擎構型所產生的混合效率做了一系列的分析。 Scramjet is a very high-tech difficulty of the propulsion system, it operations of the environment usually as the thinner the air flow field, in this case macro based on the assumption of continuous flow was obviously weak. Hence, we have to discuss flow fluid by microscopic molecular model, this article using direct simulation Monte Carlo (DSMC), this method is more widely used to simulation analysis the particle movement patterns. As the Scramjet operating at high Mach number environment, therefore, when the free stream into the flow field still maintained the high momentum at this time how to make the fuel and air can be mixed well in this environment has become an important issue, mixing situation direct affect the quality of combustion, which also will produce the thrust is directly related, this article generated under different shape to do a series of mixing efficiency analysis.
