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Characterization of Combustion Processes of Fuel Sprays Injected into High-Temperature and High-Speed Airstream

高温高速气流中燃料喷雾燃烧过程的表征

基本信息

批准号：
04452149
负责人：
HIROYASU Hiroyuki
金额：
$ 0.38万
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 (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452149/
关键词：
Spray Combustion Gas Turbine Combustor High-Temperature Wind Tunnel Air Heater by Combustion Critical Fuel Flow Rate for Blow Off Spontaneous Ignition Bluff Body Mixing Distance ガスタービン逆火

项目摘要

An experimental study was conducted on the characterization processes of kerosene sprays injected into a high-temperature and high-speed airstream. The interior of the combustor has a rectangular cross-section of 70mm x 70mm. A bluffbody with a rectangular shape was settled at the center of the cross section of the combustor which was a certain distance(mixing distance)down the airstream from the nozzle. The experiment in this year was made of the combustion of four sprays injected from each side of the combustor. A distribution of the sprays in the airstream was changed by the location of the nozzle on each side of the combustor. Main results obtained are as follows.(1)A critical kerosene flow rate for flame blow off was decreased and then increased with the airstream temperature, but the variation was small.(2)Spontaneous ignition of the sprays at the mixing distance(between the swirl nozzles and the bluff body)was found when both the airstream temperature and the kerosene flow rate were high. A decrease in a critical kerosene flow rate for the spontaneous ignition with an increase in the airstream temperature made stable combustion range narrow.(3)Relatively homogenizing a distribution of the sprays in the combustor increased the critical kerosene flow rates for both the flame blow off and the spontaneous ignition. A stable combusion range was made wide since the increase with the airstream temperature in the critical kerosene flow rate for the spontaneous ignition was larger than that for the flame blow off.(4)The mixing length did not have a large effect on the critical kerosene flow rate for the flame blow off. An increase in the mixing length reduced the critical kerosene flow rate for the spontaneous ignition.

对喷射到高温高速气流中的煤油喷雾进行了表征过程的实验研究。燃烧室内部的矩形截面为70mm × 70mm。在距喷管气流一定距离（混合距离）处的燃烧室横截面中央设置一个矩形钝体。今年的实验是从燃烧器的每一侧喷射四种喷雾的燃烧。喷嘴在燃烧室两侧的位置改变了气流中喷雾的分布。得到的主要结果如下。(1)喷灭火焰的煤油临界流量随气流温度先减小后增大，但变化不大。(2)当气流温度和煤油流量均较高时，喷雾在混合距离处（旋涡喷嘴与钝体之间）发生自燃。随着气流温度的升高，自燃临界煤油流量的降低使稳定燃烧范围变窄。(3)喷雾在燃烧室内相对均匀的分布提高了火焰熄灭和自燃的临界煤油流量。随着气流温度的升高，自燃临界煤油流量的升高幅度大于吹灭临界煤油流量的升高幅度，从而获得了较宽的稳定燃烧范围。(4)混合长度对喷灭火焰的煤油临界流量影响不大。混合长度的增加降低了自燃临界煤油流量。