Research Initiation Award: Experimental Study on Laminar and Turbulent Flame Thickness

该项目旨在获得火焰厚度响应， 拉伸、优先扩散和湍流。 提出了 三个具体目标：㈠发展创新概念 利用速度剖面来定义和量化火焰 厚度，以便它们可以有意义地评估， 容易和准确;（ii）获得一维，绝热， 预混火焰厚度;（iii）获得火焰厚度 对物理化学参数的响应，以便与 理论预测。 此外，由此产生的结果 拟议的计划可以为扩展这一概念提供基础 非预混火焰。 速度分布和条件 利用激光多普勒获得速度统计 速度测量法 将使用逆流喷嘴配置 以稳定平面绝热火焰。 从这项拟议的实验研究获得的结果 将是有价值的，因为（i）他们将验证一个简单的 评价火焰厚度的方法，这是一个内在的 火的属性;（二）他们将巩固许多 目前使用的定义，从而促进其统一 （三）说明和用法;（三）补充和 火焰厚度的试验理论研究。 因为火焰 厚度已被广泛用于描述 火焰在火焰稳定和解释中的重要性 湍流燃烧，建议的研究是基础和 对燃烧科学和技术具有重要的实际意义。

This project aims to obtain the flame thickness response to stretch, preferential diffusion, and turbulence. It proposes three specific objectives: (i) develop an innovative concept of using velocity profiles to define and quantify flame thicknesses such that they can be meaningfully evaluated with ease and accuracy; (ii) obtain one-dimensional, adiabatic, premixed flame thicknesses; (iii) obtain flame thickness response to physico-chemical parameters for comparison with theoretical predictions. Furthermore, the results from this proposed program may provide a basis for extending the concept to nonpremixed flames. The velocity profiles and conditional velocity statistics will be obtained by using laser doppler velocimetry. A counterflow nozzle configuration will be used to stabilize planar, adiabatic flames. The results obtained from this proposed experimental study will be valuable because (i) they will validate a simple method of evaluating the flame thickness which is an intrinsic property of flames; (ii) they will consolidate numerous definitions in use presently, thereby promoting unity in its description and usage; and (iii) they will complement and test theoretical studies on flame thickness. Because flame thickness has been extensively used in describing behavior of flames important in flame stabilization and for interpreting turbulent combustion, the proposed study is of fundamental and practical importance to combustion science and technology.