爆震過程非常接近恆定體積的燃燒過程,基於恆定體積燃燒過程的發動機具有比傳統恆壓燃燒循環過程的發動機有更高的熱力學效率,熱力學循環效率的潛在優勢成為了研究爆震發動機的主要原因。而噴嘴研究表明,脈衝爆震引擎使用收縮-發散噴嘴顯著提高了推進性能,對於給定的填充時間,考慮了點火壓力、點火區間、閥門關閉及吹掃時間對單管脈衝爆震引擎的推力影響。為了比較單管脈衝爆震引擎和多管脈衝爆震引擎性能上的優劣,分別模擬了多管不同點火頻率去探討其推力的性能分析,與單管結果的比較發現,多管設計在特定的操作頻率方面提高了發動機性能穩定性和脈衝值。而在本研究中使用了HMSTH type AUSMD方法來解決爆震波中的問題,分析了單管和多管爆震引擎中噴嘴內部及噴嘴出口的震波差異。
The detonation process is very close to the constant volume combustion process, engines based on a constant volume combustion process have higher thermodynamic efficiency than traditional constant pressure combustion cycle engines, the potential advantage of thermal cycle efficiency has become the main reason for studying knock engines. Nozzle studies have shown that the use of convergent-divergent nozzles in pulse detonation engines can significantly improve propulsion performance. For a given filling time, the thrust of a single-tube pulse detonation engine is considered by the ignition pressure, ignition interval, valve closing and purge time. In order to compare the advantages and disadvantages of single-tube pulse detonation engine and multi-tube pulse detonation engine, the multi-tube simulation performance with different ignition frequency and thrust performance is discussed. Compared with the single-tube results, it was found that the multi-tube improves the stability and pulse value of engine performance. This study uses the HMSTH AUSMD method to solve the detonation wave problem, and analyzes the difference between the shock wave at the nozzle of the single-tube and multi-tube detonation engines and the shock wave at the nozzle outlet.