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发动机测试现场的实验环境普遍存在强振动、高噪声等干扰条件,常规的用于光学实验室的激光诊断测量系统庞大、复杂且易受干扰,无法直接应用到这样的恶劣环境中。通过模块化设计和有针对性的抗振动设计,研制了一台可用于发动机现场测试、体积相对较小、结构紧凑的集成化相干反斯托克斯拉曼散射(CARS)诊断系统。测温实验前测量了发动机测试过程中的振动结果,分析了振动来源和特点,有针对性地采取了减振措施,进一步降低了振动对集成化系统的干扰。利用集成化CARS系统测量了超声速燃烧室出口喷流的温度,获得了单脉冲CARS温度拟合结果和温度随时间的变化。测量结果显示不稳定燃烧状态下的温度抖动范围大于稳定燃烧状态,但平均温度低于稳定燃烧状态,表明不稳定燃烧的效率相对较低。
The experimental environment of the engine test site is generally characterized by strong vibration, high noise and other interference conditions. The conventional laser diagnosis and measurement system for optical laboratories is huge, complex and subject to interference and can not be directly applied to such a harsh environment. Through modular design and targeted anti-vibration design, an integrated coherent anti-Stokes Raman scattering (CARS) system with relatively small size and compact structure for engine field test was developed. Before the temperature measurement, the vibration results during the engine test were measured, the sources and characteristics of the vibration were analyzed, and the vibration reduction measures were taken in order to further reduce the interference of the vibration to the integrated system. The integrated CARS system was used to measure the jet temperature at the supersonic combustor outlet. The fitting results of single-pulse CARS temperature and the change of temperature over time were obtained. The measurement results show that the range of temperature jitter in unstable combustion is greater than that of steady combustion, but the average temperature is lower than that of steady combustion, which indicates that the efficiency of unstable combustion is relatively low.