基于CARS技术的超燃冲压发动机点火过程温度测量

相干anti-Stokes Raman散射（coherent anti-Stokes Raman scattering，CARS）技术作为一种非接触测量手段，已广泛应用于多种发动机模型燃烧室温度测量及地面试验.然而，目前的工作主要集中在稳态燃烧场温度的测量，缺乏用高分辨率的单脉冲来测量瞬变的燃烧火焰温度及组分浓度的研究.基于CARS理论，结合多参数拟合算法，开发了基于MATLAB的CARS光谱计算和拟合程序CARSCF；利用McKenna平面火焰炉在不同工况下进行了温度测量，并与DLR测量结果进行对比，结果显示开发的CARSCF具有较高的测量重复性和准确性；最后将CARS技术应用于测量超燃冲压发动机点火过程中的温度测量，获取了点火过程中的温度.结果显示，在来流Mach数为3的条件下，H₂/air点火过程中温度呈现急剧上升然后缓慢下降，而CARS信号则呈现急剧上升然后急剧下降随后又缓慢上升的趋势，并且在点火过程中最高温度为1 511 K. 

Temperature Measurement Based on CARS in Scramjet Ignition Process

As a non-intrusive measurement method,coherent anti-Stokes Raman scattering(CARS)has been widely used in combustor temperature measurement and ground test of various engine models.However,the current works focus on the temperature measurement in combustion at steady-state,and lack the research about high-resolution measurement of the temperature and composition in combustion at transient-state.In this paper,a CARS spectrum calculating and fitting program CARSCF was developed.Its accuracy was verified by using McKenna combustor and comparing with the results from DLR.The result shows that CARSCF has sufficient repeatability and accuracy.The CARS signal in scramjet ignition process was measured and then used to calculate temperature.The results show that,during the H 2/air ignition at Mach 3,the CARS signal first rises rapidly and then falls sharply and finally rises slowly,while the temperature increases sharply and then decreases slowly with a maximum temperature of 1511 K.