液态燃料喷注压力对旋转爆轰波影响的实验研究

Experimental Study for Effects of Liquid-Fuel Injection Pressure on Rotating Detonation Wave

关键词:  旋转爆轰波  液态燃料  雾化  喷注压力  传播特性

Key words:  Rotating detonation wave  Liquid fuel  Atomization  Injection pressure  Propagation characteristics

摘要:

为了深入研究液态燃料旋转爆轰波传播特性，以汽油为燃料，富氧空气为氧化剂，开展了液态燃料喷注压力对旋转爆轰波传播特性影响的实验研究。使用马尔文粒度仪对不同喷注压力下的雾化流场进行测量，结果表明：在喷嘴出口各平面上的液滴粒径均满足正态分布；且随着喷注压力的增大，液滴雾化细度不断改善，在距离喷嘴出口60mm处二次雾化基本完成。在汽油质量流率为96g/s，当量比为1.3工况下，旋转爆轰波以单波模态传播，传播频率为2494Hz，平均传播速度为1198m/s。液态燃料的喷注压力对旋转爆轰波的传播特性具有较大的影响，当喷注压力为0.6MPa时，由于液滴的雾化粒径较大，无法形成旋转爆轰波。随着喷注压力的增大，液滴雾化细度得到改善，旋转爆轰波可以成功起爆并稳定自持传播，传播速度和平均压力均逐渐增大，传播稳定性也得到改善。

Abstract:

In order to study the propagation characteristics of liquid-fuel rotating detonation wave， series of experimental studies were carried out on the rotating detonation engine with gasoline as fuel and oxygen-rich air as oxidant. The atomization fields under different injection pressure were measured by Malvern particle size analyser. The results show that the droplet diameter at each plane from the nozzle outlet meets the normal distribution. With the increase of injection pressure， the droplet atomization characteristics improves apparently， and the secondary atomization is basically completed at 60mm plane away from the nozzle. When the mass flow rate of gasoline is 96g/s and the equivalence ratio is 1.3， the rotating detonation wave propagates in a single-wave mode， whose propagation frequency is 2494Hz and the average propagation speed is 1198m/s. The liquid fuel injection pressure has a great influence on the propagation of the rotating detonation wave. When the injection pressure is 0.6MPa， the rotating detonation wave can not be formed due to the large droplet diameter. With the increase of injection pressure， the atomization fineness of droplets is improved. The rotating detonation wave can be successfully initiated and propagated in a stable and self-sustaining way. The propagation speed and average pressure increase gradually and the propagation stability is also improved.