小型滞止旋流火焰结构和空气动力学特性的实验研究  

INVESTIGATION OF THE STRUCTURES AND AERODYNAMICS OF STAGNATION-POINT SWIRL FLAMES

作　　者：王俊晶[1] 李水清[1] 马斌[1] 宋蔷[1] 姚强[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2009年第12期2133-2136,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50776054);清华大学基础研究基金资助(No.JC2007014);国家重点基础研究发展规划项目资助(No.2002CB211600)

摘　　要：本文结合旋流火焰和滞止火焰的特点,发展了一种新的滞止弱旋火焰燃烧器。首先,基于中心通流的弱旋旋片发展了旋片旋流数的实验测量方法,并结合推导的适用于弱旋旋片的旋流数计算公式,为旋流数的准确测量提供了一种新的简单有效的途径。其次开展了关于火焰结构、贫燃极限、稳燃区间、火焰最高温度的研究,得出加入旋片后的滞止弱旋火焰的贫燃极限,比之常规滞止射流火焰,其当量比从0.71显著地降低到0.51。最后,结合PIV技术开展了滞止弱旋火焰的流场实验研究。In this paper, a stagnation-point swirl flame is initailly proposed by combining the advantages of both stagnation-point flames and low-swirl flames. First, a swirl-number calculation formula that is suitable for the inner-core ventilating swirler, namely the swiler of low swirl devices, is derived. And then a pressure-drop distribution domainated technique is developed for the accurate measurement of the swirl number of such kind of device. Furthermore, the flame structure, lean flammability, flame stablization and maximum flame temperature are studied in detail. Especially, with the addition of swirler, the lean flammability of stagnation-point swirl flame is extended from 0.71 （that is the lean fammability of stagnation-point jet flame） to 0.51. Finally, the flow-field of stagnation swirl flame is measured with partiele-image-veloeimetry （PIV）.

关 键 词：旋片 旋流数 滞止弱旋火焰 

分 类 号：TK16[动力工程及工程热物理—热能工程]