带压燃烧场2D温度分布的激光吸收光谱测量初步研究

Aiming to achieve the combustion diagnosis of high pressure combustion field such as scramjet, Tunable Diode Laser Absorption Spectroscopy (TDLAS) was used to develop preliminary research on the temperature diagnosis of combustion with pressure condition. A Computed Tomography (CT) algorithm according to spectrum coupling was used to reconstruct two-dimensional temperature distribution. Using the sum of squared differences and the zero mean normalization cross correlation as the evaluation indicators which were able to analysis the reconstruction accuracy of CT-TDLAS. A pressure combustion chamber temperature distribution measurement experimental system was set up. With pressure sensor and CCD camera, the changing of the pressure and flame which contented combustion ignition process under pressure condition were recorded. Using wide-band tunable diode laser which can achieve 1335~1375nm output to reconstruct time-resolved two-dimensional temperature distribution. The experimental results show that CT-TDLAS has high reconstruction accuracy, the changing tendencies of pressure, flame and time-resolved two-dimensional temperature distribution result are similar, CT-TDLAS can achieve high-resolution time-resolved 2D temperature measurement and provide quantitative temperature distribution information to the research of combustion with pressure condition, which can give help to diagnosis of pressure combustion as well as further high temperature and high pressure combustion flow field.