基于激光吸收光谱层析技术的超燃冲压发动机氢气引导煤油燃烧过程分析

为了解超燃冲压发动机引导点火过程中燃烧流场截面参数分布特征和传播规律,利用激光吸收光谱技术对氢气引导煤油燃烧过程进行测量和分析.在约200ms的引导燃烧过程中,激光吸收光谱层析测量系统对流场截面温度二维分布进行了全程的测量,时间分辨率为1ms.对于测量结果,重点分析了氢气加注、上壁面煤油加注和下壁面煤油加注三个关键阶段...

Analysis of Kerosene Combustion with Pilot Hydrogen in Scramjet Based on Tomography Absorption Spectroscopy

In order to understand the parameter distribution and propagation characteristics of the flow field on cross-section during the pilot ignition in the scramjet, laser absorption spectroscopy was used to measure and analyze the process of kerosene combustion with pilot hydrogen. During the pilot ignition of about 200ms, the 2D temperature distribution of the flow field on cross-section was measured by the system of tomography absorption spectroscopy with the time resolution of 1ms. For the measurement results, the analysis of the flow field changes was focused on three key stages: hydrogen injection, kerosene injection on the upper wall and kerosene injection on the lower wall. The results show that in the pilot ignition mode adopted in this paper, the flame propagation velocity between the upper and lower walls is about 15m/s. when kerosene is ignited, the flow field has a strong non-uniformity, and the high temperature area is concentrated near the kerosene nozzle with maximum temperature above 2500K. It is verified that tomography absorption spectroscopy can provide rich and effective parameter distribution information of the flow field cross-section for the ignition research of the scramjet.