煤油两相连续旋转爆震燃烧室工作特性试验研究

Experimental Investigation on Operating Characteristics of Two-Phase Continuous Rotating Detonation Combustor Fueled by Kerosene

为了深入分析煤油燃料两相连续旋转爆震燃烧室的工作特性,采用富氧空气或氧气为氧化剂,通过试验得到爆震波的时域、频域特征,对两相连续旋转爆震燃烧室中爆震波的起爆过程和稳定后的传播过程进行研究。利用基于激光散射相位多普勒分析(PDA)技术对雾化流场进行了测量,得到喷注器出口不同平面处煤油液滴速度与直径的统计分布。试验结果表明当煤油流量为78g/s,氧气流量为224.0g/s,空气流量为72.5g/s,当量比为1.083时,燃烧室在单波模态下工作,爆震波传播频率为0.904k Hz,平均转速为649m/s。使用氧气作为氧化剂,当煤油流量为81.8g/s,氧气流量为231.8g/s,当量比为1.222时,燃烧室在双波模态下工作,爆震波传播频率为5.882k Hz,平均转速为1848m/s,传播过程中表现出很强的非定常性。在当量比为0.805~0.908的富氧工况下,随着氧化剂中含氧量的增加,爆震波的速度逐步增大,最终达到2440m/s;在当量比为1.057~1.220的富燃工况下,随含氧量的增加爆震波速度呈现线性增长的特征。

To analyze operating characteristics of two-phase continuous rotating detonation combustor fueled by kerosene more deeply,the time/frequency-domain characteristics of ignition and propagation processes in the combustor were acquired with experimental method when the oxidizer was air with more oxygen or pure oxygen. The droplet velocity and diameter distribution in different planes out of the injector were measured with the PDA system. The experimental results show that when the mass flow rates of kerosene,O2 and air are 78.0g/s,224.0g/s and 72.5g/s,and the equivalent ratio of 1.083 respectively,the combustor steadily works in singlewave mode,and the detonation wave has an average frequency of 0.904 k Hz and an average velocity of 649m/s.When the mass flow rates of kerosene and O2 are 81.8g/s and 231.8g/s,and the equivalent ratio of 1.222 respectively,the combustor works in double-wave mode,where the detonation waves have an average frequency of5.882 k Hz and an average velocity of 1848m/s,and the propagation process shows strong unsteadiness when the oxidizer is pure oxygen. The detonation velocity increases with the rise of oxygen content in oxidant when the equivalent ratio ranges from 0.805 to 0.908, reaching 2440m/s. As the equivalent ratio ranges from 1.057 to1.220,the detonation velocity increases linearly with the rise of oxygen content.