基于TDLAS技术的燃烧室出口温度场测量

Measurement of combustor exit temperature field based on tunable diode laser absorption spectroscopy technology

为验证可调谐二极管激光吸收光谱(TDLAS)技术,在航空发动机燃烧室燃烧流场测量领域的适用性,以自主设计的高温升模型燃烧室为研究对象,结合多光路正交布网的测量方法,对燃烧室出口的燃气温度进行测量,并利用层析算法实现测量截面的二维分布重建,同时采用固定的温度探针进行测量与对比验证。结果表明,采用TDLAS结合层析重建的方法,基本能获得具有时间分辨的燃烧室出口温度分布的主要特征,可以区分高温区和低温区,但单线测量和场分布重建精度还有待于进一步提高。进一步优化该系统,可用于航空发动机燃烧室出口温度和组分浓度分布测量。

In order to grope for the applicability of tunable diode laser absorption spectroscopy （TDLAS） technology in the combustion field measurement of aero engine combustor, a high temperature rise model combustor was used for study. The gas temperature at the combustor exit section was measured by TDLAS technology and the grid method of orthogonal intersection of multiple light path. The two dimensional distribution reconstruction in the measurement section was realized combined with tomography arithmetic. The TDLAS measurements were verified using the measured value of fixed temperature probes at the combustor exit. The results indicate that the primary characteristic of combustor exit temperature distribution with time resolution could be captured applying the method of TDLAS combined with tomography reconstruction, and the high and low temperature zone can be distinguished. But the precision of single light path measurement and distribution reconstruction would be improved further in the future. The optimized TDLAS system will be used to measure the temperature and concentration distributions of aero-engine combustor exit.