Study on Effect of Obstacle Shapes on Filling Process in Pulse Detonation Rocket Engine

障碍物对脉冲爆震发动机填充过程的影响研究

School of Power and Energy, Northwestern Polytechnical University, Xi'an 710129, China

Received: 2 November 2019

Abstract

In order to explore the influence of obstacle shapes on the filling process of pulse detonation rocket engine under valveless self-adaptive working mode, the numerical simulations of two-phase single filling process and multi-cycle experiment were carried out, in which gasoline was utilized as fuel, and oxygen-enriched air as oxidizer. The effects of four kinds of obstacles with different shapes on the filling process of PDRE were studied. The results showed that the existence of obstacles blocks the filling of fuel into the tail of detonation tube, resulting in a great non-uniformity of filling results in the axial and radial directions. Fuel droplets collect near the head and wall of detonation tube, and droplets are seriously blocked by orifice plates. The detonation initiation and stable propagation can be achieved by Shchelkin spirals, annular grooves and spiraling grooves, while the detonation initiation cannot be achieved by orifice plates.

摘要

为了探究障碍物对脉冲爆震火箭发动机（pulse detonation rocket engine，PDRE）在无阀自适应工作方式下燃料与氧化剂填充过程的影响，采用汽油为燃料，富氧空气为氧化剂，开展了装有4种障碍物的无阀式PDRE两相单次填充过程的数值模拟及PDRE多循环爆震实验研究。研究结果表明：障碍物阻碍了燃料向爆震管尾部的填充，使得填充结果存在极大的轴向和径向不均匀性，燃油液滴在爆震管头部和管壁附近聚集，孔板型障碍物对燃料的填充有严重的阻碍作用；Shchelkin螺旋、螺旋凹槽和环形凹槽可以实现爆震起始与稳定传播，而孔板无法实现爆震起始。