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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。
In order to further analyze the working characteristics of kerosene fuel two-phase continuous rotary detonation combustor, using oxygen-enriched air or oxygen as oxidant, the time-frequency and frequency-domain characteristics of detonation wave were obtained through experiments. Shock wave initiation process and the stability of the spread of the process of research. The atomization flow field was measured by laser scattering phase-doppler analysis (PDA), and the statistical distribution of velocity and diameter of kerosene droplets at different planes of the injector exit was obtained. The experimental results show that when the flow rate of kerosene is 78g / s, the flow rate of oxygen is 224.0g / s, the flow rate of air is 72.5g / s and the equivalence ratio is 1.083, the combustion chamber operates in single-wave mode and the propagation frequency of detonation wave is 0.904k Hz, the average speed of 649m / s. Using oxygen as the oxidant, the combustion chamber operates in a dual-wave mode with a kerosene flow rate of 81.8 g / s, an oxygen flow rate of 231.8 g / s and an equivalence ratio of 1.222. The detonation wave propagation frequency is 5.882 kHz and the average speed is 1848m / s, the process of transmission showed a strong unsteady. Under the condition of oxygen enrichment with equivalent ratio of 0.805-0.908, the detonation wave velocity increased gradually with the increase of oxygen content in the oxidizer, finally reaching 2440m / s. In the rich condition with equivalent ratio of 1.057-1.220, , With the increase of oxygen content, the detonation wave velocity shows linear growth characteristics.