脉冲爆震燃烧室出口燃气能量分布特性

Energy distribution characteristics of gas at outlet of pulse detonation combustor

为了提高脉冲爆震燃烧室出口燃气能量转换效率,采用数值计算方法,研究了带气动阀和爆震增强结构的脉冲爆震燃烧室出口燃气能量分布特性,结果表明:脉冲爆震燃气的膨胀过程先后经历一次膨胀、二次膨胀和过度膨胀3个阶段,单个周期内二次膨胀阶段的时间和能量占比最大;燃烧室出口燃气压力势能、动能、内能和能流密度的分布主要受燃气压力的影响,且变化规律与燃气压力一致;一次膨胀阶段燃气增加的压力势能、动能、内能分别占单个周期的47.9%、25.9%、25.1%;二次膨胀阶段燃气增加的压力势能、动能、内能分别占单个周期的50.2%、57.6%、58.1%。

In order to improve the energy conversion efficiency of the gas at the outlet of the pulse detonation combustor, a numerical calculation method was used to study the energy distribution characteristics of the gas at the outlet of the pulse detonation combustor with a pneumatic valve and detonation reinforcement structure. Results showed that the expansion process of pulse detonation gas had three stages: primary expansion, secondary expansion and over expansion. The proportion of secondary expansion time and energy was largest in a single cycle;the distribution of gas pressure potential energy, kinetic energy, internal energy and energy flow density at the outlet of the combustion chamber was mainly affected by the gas pressure, and the change law was consistent with the gas pressure;the pressure potential energy, kinetic energy and internal energy of gas increased during the primary expansion stage accounted for 47.9%, 25.9% and 25.1%, respectively, in a single cycle;the pressure potential energy, kinetic energy and internal energy of gas increased during the secondary expansion stage accounted for 50.2%, 57.6% and 58.1%, respectively, in a single cycle.