多循环脉冲爆震发动机净推力估算

Net thrust prediction of multi-cycle pulse detonation engine

关键词:  脉冲爆震发动机+  阻力  推力  气动阀

Key words:  Pulse detonation engine~+  Drag  Thrust  Pneumatic valve

摘要:

为了研究试车台上脉冲爆震发动机(PDE)净推力的估算方法,在常温常压条件下,进行了大量的多循环爆震试验,在内径为150mm,长度为1800mm的爆震管中,成功地产生充分发展的爆震波。采用了动态和稳态推力计分别测量试车台上PDE的净推力及气动阀开和关时PDE的阻力,建立了试车台上PDE净推力的近似计算模型,同时研究了PDE净推力的主要影响因素。试验结果表明,PDE阻力与模拟飞行速度(或爆震室充填速度)有关;直接测量到的发动机推力与利用模型计算的净推力基本一致。研究结果对工程应用的PDE的优化设计,深入研究具有重要的参考价值。

Abstract:

Investigation on net thrust of multi-cycle pulse detonation engine （PDE） with a detonation tube which has inner diameter of 150mm and length of 1800mm,filling liquid gasoline and air into the tube as detonable mixture by aero-valve, was performed. Through a number of tests initially at ambient conditions （T₁=300K and p₁=100kPa）, fully developed repetitive detonation waves were produced. The net thrust of PDE was obtained by integration of the record of instantaneous thrust by direct measurements. A steady static load cell was used to measure respectively the drag thrust during the periods of close and of open aero-valve. An approximate mathematic model for net thrust of PDE was formulated. Experimental results show that the drag thrust depends on flight speed （or filling speed）. The net thrust measured directly agrees well with the calculated result. The conclusion will help to optimize the design of practical PDE.