被动标量湍流混合的实验研究方法与进展  

Methods and progress of experimental research on passive scalar turbulent mixing

作　　者：李慧鑫 徐多[1,2] LI Huixin;XU Duo(The State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院力学研究所非线性力学国家重点实验室,北京100190 [2]中国科学院大学工程科学学院,北京100049

出　　处：《实验流体力学》2024年第4期90-103,共14页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金项目(92152106,11988102);中国博士后科学基金项目(2023M733589)。

摘　　要：湍流混合与日常生活和工程应用息息相关,研究湍流混合对湍流理论及湍流燃烧、化学工程等重要领域具有重要意义。在湍流混合的实验研究方面,传感器技术和非接触式(光学)测量技术的发展促进了人们对湍流混合多尺度、非线性过程的深入研究和机理认知。本文介绍了标量场湍流混合实验中较为常用的瑞利散射技术和激光诱导荧光技术,着重讨论了提高后者空间测量分辨率的方法,可为湍流混合的二维高分辨率精细化测量提供思路。另外,从实验测量角度对小尺度混合的标度律(黏性−对流区)、标量场的概率密度函数和标量场混合界面的分形维数等方面进行了介绍,旨在结合被动标量湍流混合基础理论简要介绍相关实验研究方法与进展。Turbulent mixing plays a vital role in daily life and engineering applications.Extensive research in turbulent mixing is crucial for various subjects,including turbulent theories,turbulent combustion,and chemical engineering.For the experimental studies of turbulent mixing,the development of sensors and non-intrusive laser-based measurement techniques furthers exploring and understanding the multi-scale nonlinear process in turbulent mixing.This review focuses on the Rayleigh scattering technique and laser-induced fluorescence technique for passive scalar field measurements.Potential ways to improve the spatial resolution of laser-induced fluorescence are introduced and discussed for measurements of turbulent mixing in two dimensions.Then an experimental perspective on small-scale mixing is presented,covering topics of the scaling law of mixing in the viscous-convective regime,the probability density function of scalar fluctuation fields,and the fractal dimension of the mixing interface.This work aims to introduce fundamental experimental methods and progress on the passive scalar turbulent mixing,together with the corresponding theoretical basis.

关 键 词：湍流混合 被动标量场 标度律 概率密度函数 分形维数 

分 类 号：O357.5[理学—流体力学]