基于激光诊断的分子标记示踪测速技术研究进展

随着飞行器速度的不断提升，高超声速气流流动理论、高超声速燃烧流场分析、飞行器空气动力学特性等研究的重要性日益凸显。目前常规的速度测量方法在面对高超声速复杂流场环境时受到的限制越来越明显，需要研究新的技术以满足流场内精确速度测量需求。分子标记示踪测速技术因其非侵入、无跟随性限制等优势正在成为研究热点。本文阐述了纳秒激光分子标记示踪测速技术、飞秒激光分子标记示踪测速技术的基本原理、主要参数和工作特点，分析了这些技术在测量中所面对的挑战，并对其在科学及工程领域中的应用前景展开了讨论，为推动高超声速复杂流场环境速度测量技术发展提供借鉴。

The progress of molecular tagging velocimetry technology based on laser diagnosis

As the aircraft''s speed increases, the research on hypersonic aerodynamics, hypersonic combustion flow field, and aircraft aerodynamic characteristics has become more and more important. The conventional velocity measurement methods are increasingly limited in the complex hypersonic flow field, and new measurement techniques need to be investigated to meet the demand for the accurate measurements of the flow. Therefore, the molecular tagging velocimetry is becoming a hot research topic because of its advantages of non-intrusiveness and no limitation of following behaviors. This paper describes the basic principles, main parameters, and operating characteristics of nanosecond laser molecular tagging velocimetry and femtosecond laser molecular tagging velocimetry, analyzes the challenges faced by these techniques in measurement and discusses the prospects of their application in science and engineering fields. This paper provides a reference for the development of velocity measurement techniques in the hypersonic complex flow field.