定容燃烧弹内压力振荡特性研究  

Research on Pressure Oscillation Characteristics in Constant Volume Bomb

作　　者：李加兴 葛睿涵 胡二江[1] 黄佐华[1] LI Jia-Xing;GE Rui-Han;HU Er-Jiang;HUANG Zuo-Hua(School of Energy and Power Engineering,XVan Jiaotong University,Xian 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《工程热物理学报》2021年第7期1869-1878,共10页Journal of Engineering Thermophysics

基　　金：陕西省自然科学基金(No.2020JC-04)。

摘　　要：本文在定容燃烧弹上研究了正庚烷与异辛烷在不同掺混比下的压力振荡特性,并分析了燃烧过程中的声压信号和火焰图片的亮度与压力振荡特性的联系。研究表明,随着正庚烷掺混比的增加,压力振荡的强度逐渐增强;同一掺混比下,压力振荡强度随当量比的增加,先增大后减小。实验中声压和火焰亮度的变化趋势与压力相同。最后,利用Ar/He/CO_(2)三种惰性气体替代N_(2)进行实验,证明容弹内的压力振荡是火焰自加速引起的。In this paper,the pressure oscillation characteristics of n-heptane and isooctane at different mixing ratios are studied on a constant volume combustion bomb,and the relationship between the sound pressure signal and the brightness of the flame picture during the combustion process and the pressure oscillation characteristics are analyzed.Studies have shown that with the increase of the mixing ratio of n-heptane,the intensity of pressure oscillation gradually increases;under the same mixing ratio,the intensity of pressure oscillation first increases and then decreases with the increase of the equivalent ratio.In the experiment,the change trend of sound pressure and flame brightness is the same as the pressure.Finally,three inert gases of Ar/He/CO_(2) were used to replace N_(2) in experiments,which proved that the pressure oscillation in the container was caused by flame self-acceleration.

关 键 词：压力振荡 定容弹 频谱分析 稀释气 

分 类 号：TK16[动力工程及工程热物理—热能工程]