喷气发动机湍流燃烧场激光定量诊断技术研究进展

Development of Laser-Based Quantitative Diagnostic Techniques for Turbulent Combustion Flow Field of Jet-Engines

关键词:  喷气发动机  燃烧流场  激光诊断  定量测量  综述

Key words:  Jet-engine  Combustion flow field  Laser-based diagnostics  Quantitative measurement  Overview

摘要:

燃烧流场参数的定量测量是发动机研发不可或缺的重要组成部分，以煤油为燃料的喷气发动机内流场是高温、高压的强湍流复杂燃烧场。本文针对喷气发动机燃烧流场温度、速度、组分浓度等主要参数定量测量的需求，重点介绍本实验室研发的相干反斯托克斯拉曼散射（CARS）测温、OH示踪测速（HTV）、自发拉曼散射（SRS）测量组分浓度的实验系统及其在发动机燃烧流场诊断中的应用。具体分析定量测量的难点，提出解决方法和攻克的关键技术，给出地面试验现场测量结果和测量不确定度。

Abstract:

The quantitative measurements of the characteristics of combustion flow field are essential for the development of engines. The inner flow of jet-engine fueled by kerosene is a complex strong turbulent combustion flow field with high temperature and high pressure. The present paper will focus on the quantitative diagnostic techniques developed by the authors’ laboratory， which directed against the needs of the quantitative measurements of temperature， speed and species concentration for the jet-engine combustion flow field. The experimental set-up consists of Coherent Anti-Stokes Raman Scattering（CARS） system for temperature measurement， the Hydroxyl Tagging Velocimetry（HTV） system for speed measurement and the Spontaneous Raman Scattering（SRS） system for species concentration measurement. The applications of this experimental system in the diagnostics of complex strong turbulent combustion flow field are introduced. The difficulties of quantitative measurement techniques are analyzed concretely. The solved methods and the key techniques are presented. The measured results and the uncertainties for ground testing of jet-engine are given.