混合室结构对脉冲爆轰发动机工作过程影响的试验研究

Experimental Investigation of Effects of Mixing Chamber Structures on Performance of Pulse Detonation Engine

为了改善两相脉冲爆轰发动机内燃油雾化混合效果,通过试验研究了文氏管、挡板、掺混器、文氏管和挡板组合、文氏管和掺混器组合这五种不同的混合室结构对管内雾化混合和燃烧转爆轰过程的影响。试验结果表明:两种组合型混合室结构的雾化混合效果优于其他三种混合室结构。文氏管和挡板组合虽然雾化效果稍弱于文氏管和掺混器组合,但是径向液滴分布上更为合理;低频时,安装文氏管和挡板平均压力峰值最高能达到4.4MPa;高频时,安装文氏管和掺混器工作频率最高能达到32Hz;在试验范围内,改善混合室结构,形成雾化效果好和分布合理的可爆混合物有利于提高脉冲爆轰发动机的工作频率。

In order to improve the effects of atomization and mixing in two-phase pulse detonation engine （PDE）, the experiment was carried out by installing five different kinds of structures of the mixing chamber in PDE. The experimental results show that the atomization and mixing effect of two kinds of combined chambers are better than the others. The gasoline-air distribution performance of venturi and baffle combination structure is slightly worse than that of venturi and mixer combination structure,but the radial droplet distribution of venturi and baffle combination structure is more reasonable. When the operating frequency is low,the peak pressure of PDE by installing venturi and baffle combination structure is the highest and it can reach 4.4MPa. When the PDE needs higher operating frequency, the operating frequency of PDE by installing venturi and baffle combination structure is the highest and it can reach 32Hz. In the experimental range, the effect of atomization and mixing can be improved by installing better structures of the mixing chamber in order to increase the operating frequency of PDE.