权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Combustion of Fuel Spray Injected into High Speed Airstream

喷射到高速气流中的燃料喷雾的燃烧

基本信息

批准号：
02650046
负责人：
HIROYASU Hiroyuki
金额：
$ 1.22万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650046/
关键词：
Fuel Injection Liquid Jet Spray High Speed Airstream Drop Breakup Afterburner Ramjet Engine 微粒化ザウタ平均粒径分散

项目摘要

The atomization process of a liquid jet in a high speed airstream was investigated by using the window tunnel whose maximum airstream velocity was 140 m/s(Mach number is 0.4). The liquid(water)was injected across the airstream from the injector with an niner diameter of 0.9 mm. The shape of the spray was measured by taking photograph. Sauter mean diameter was measured by a drop size analyzer based on tlie Fraunhofer diffraction theory. Spatial distribution of a spray was measured by a sampling method. Deformation and atomization processes of a liquid column observed by means of laser sheet tomography. Calculation of spatial distribution of injected liquid, drop diameter and drop trajectory. The drop was calculated based on the RayleighTaylor breakup model. When the air velocity was high, the holizontal section of the liquid column was bowed by the high speed airstream and small drops were produced at both sides of the bowed column. A cavity with no drops was found behind the liquid column. When the airstream velocity and the injection velocity were low, the liquid column wound across the airstream, and then relatively large drops were produced. The calculation showed that the drop diameter decreased rapidly along the outer line of the spray, but it scarcely decreased along the inner line of the spray. The outer and inner lines agreed with the trajectories of a drops whose initial diameter were 900 mum and 10 mum, respectively. The spatial distribution of the calculated drop diameter agreed with the spatial distribution of the measured Sauter mean diameter away from the injector. Disagreement of the drop diameter near the injector between the calculation and the measurement suggested that the breakup model of the liquid column had to be incorpolated into the calcultion.

采用最大气流速度为140 m/s（马赫数为0.4）的窗洞，研究了液体射流在高速气流中的雾化过程。液体（水）从直径为0.9 mm的喷嘴穿过气流注入。喷雾的形状是通过拍照来测量的。基于弗劳恩霍夫衍射理论，采用液滴尺寸分析仪测量了索特平均直径。采用采样法测量了喷雾的空间分布。用激光层析成像技术观察液体柱的变形和雾化过程。计算注入液的空间分布、液滴直径和液滴轨迹。下降是根据瑞利-莱特-泰勒分手模型计算的。当气流速度较大时，液柱水平段被高速气流弯曲，在弯曲柱两侧产生小液滴。在液柱后面发现一个没有液滴的空腔。当气流速度和喷射速度较低时，液柱在气流中缠绕，产生较大的液滴。计算结果表明，液滴直径沿喷雾外线迅速减小，但沿喷雾内线几乎没有减小。外线和内线与初始直径分别为900 μ m和10 μ m的液滴轨迹一致。计算得到的液滴直径的空间分布与实测的离喷射器的索特平均直径的空间分布一致。计算结果与实测值不一致，说明在计算中必须考虑液柱破碎模型。