组合火焰稳定器横向喷射高温燃油液滴分布特性实验研究  

Experimental study on droplets distribution characteristics of heated fuel transverse jets of integrated flameholder

作　　者：翟文辉 范育新[1] 陈玉乾 黄玥 ZHAI Wenhui;FAN Yuxin;CHEN Yuqian;HUANG Yue(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;School of Aeronautics,Inner Mongolia University of Technology,Hohhot 010051,China;School of Aerospace Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016 [2]内蒙古工业大学航空学院,内蒙古呼和浩特010051 [3]厦门大学航空航天学院,福建厦门361005

出　　处：《推进技术》2025年第1期130-141,共12页Journal of Propulsion Technology

基　　金：国家科技重大专项(2017-III-0007-0033);先进航空动力创新工作站(HKCX2020-02-020);自治区直属高校基本科研业务费(JY20220292)。

摘　　要：为了研究高温高速来流中横向喷射高温燃油的喷雾液滴分布特性,本文采用光学拍摄和图像处理方法对外壁凹腔支板组合火焰稳定器下游高温燃油喷雾液滴分布开展了试验测量和粒径分析。研究结果表明,当燃油温度为373 K时,壁式凹腔区域内液滴数量最多,由壁式凹腔向试验段中心轴方向移动,液滴数量明显减少;在不同主流速度、温度和供油当量比下,稳定器下游各测试截面上不同粒径范围的液滴数量基本呈正态分布,液滴数量最多的粒径范围主要集中在26~40μm,其次是21.88~25μm和41~55μm,大液滴数量很少。当燃油温度增加至473 K时,大液滴基本消失,液滴数量最多的粒径范围是21.88~25μm,且总液滴数量很少,液相燃油大多数已经蒸发。随着主流速度、主流温度和燃油温度增加,稳定器下游各测试截面的液滴总数和索泰尔平均直径(SMD)均降低;与之相反,供油当量比增加时,各测试截面的液滴总数和SMD则略微上升。其中,提高燃油温度和主流速度时,SMD下降速度大于提高主流温度的结果,不过当主流速度超过100 m/s后大液滴数量减少,导致SMD的下降变缓。此外,从30~60 mm截面时,燃油喷雾的SMD下降幅度较小;从60~90 mm时,则快速下降。To investigate the droplets distribution characteristics of high temperature fuel spray in hightemperature and high-velocity crossflow,an optical measurement system and an image processing method were adopted to test and analyze the droplets diameter information downstream of a cavity-strut based integrated flameholder in heated stream.Results show that when fuel temperature is 373 K,the number of droplets in the wall cavity is the largest,but it is significantly reduced when the test cross sections move from the wall cavity to the centre axis of test section;meanwhile,the number of droplets in different particle size ranges on each test section downstream of the flameholder is basically a normal distribution under different mainstream velocities,temperatures and equivalence ratios,and the diameter of most droplets are from 26 to 40μm,followed by 21.88~25μm and 41~55μm,with few large droplets.When the fuel temperature increases to 473 K,the large droplets basically disappear,the diameter of most droplets is 21.88~25μm,the total number of droplets is very small,and most of the liquid fuel has evaporated.As mainstream velocity and temperature and fuel temperature increase,the total number of droplets and Sauter mean diameter(SMD)of each test section downstream of the flameholder are reduced.Conversely,as the equivalence ratio increases,the total number of droplets and SMD of each test section increase slightly.Particularly,when the fuel temperature and the mainstream velocity increase,the decline rate of SMD is higher than that when the mainstream temperature increases.However,when the mainstream velocity exceeds 100 m/s,the number of large droplets decreases,resulting in a slower decline in SMD.In addition,SMD of the fuel spray has a small drop from 30 mm to 60 mm section,while decreases rapidly from 60 mm to 90 mm.

关 键 词：一体化火焰稳定器 横向射流 高温油雾 液滴尺寸 液滴数目 索泰尔平均直径 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]