甲烷掺混氢气长直管道压力振荡特性研究
Study on Pressure Oscillation Characteristics of Methane Mixed With Hydrogen in Long Straight Tubes
吕森林 1李加兴 1胡二江 1黄佐华1
作者信息
- 1. 西安交通大学动力工程多相流国家重点实验室,西安 710049
- 折叠
摘要
本文研究了 CH4-H2/空气的燃烧和压力振荡特性,在长直管道燃烧平台测量了初始压力为0.15、0.1 MPa,初始温度为298 K,掺氢比范围为0～100％,当量比范围为0.8～1.5,以及管道长径比为1.43、1.86、2.29的火焰发展图像和压力振荡数据.点火形式有单点和双点.结果表明,指形火焰阶段是强压缩波形成的重要阶段,火焰加速时间和传播速度均是影响压缩波强度的因素.随着掺氢比增加,压力振荡强度整体趋势上升,主频分布在3080 Hz～3470 Hz.双点火条件下,各长径比下的压力峰值、升高率以及振荡强度均高于单点火,振荡的主频分布规律与单点火相同.
Abstract
This paper investigates the combustion and pressure oscillation characteristics of CH4-H2/air.Flame development images and pressure oscillation data were measured on a long straight tube combustion platform with initial pressures of 0.15 and 0.1 MPa,initial temperatures of 298 K,hydrogen mixing ratio range of 0 to 100％,equivalence ratio range of 0.8 to 1.5,and tube length-diameter ratios of 1.43,1.86,and 2.29.There are single point and double point ignition modes.The results indicate that the finger shaped flame stage is an important stage for the formation of strong compression waves,and the flame acceleration time and propagation speed are both factors that affect the intensity of compression waves.As the hydrogen mixing ratio increases,the overall trend of pressure oscillation intensity increases,with the main frequency distribution ranging from 3080 Hz to 3470 Hz.Under dual ignition conditions,the pressure peak,rise rate,and oscillation intensity at various aspect ratios are higher than those of single ignition,and the main frequency distribution of oscillation is the same as that of single ignition.
关键词
甲烷/氢气/压力振荡/振荡强度/火焰自加速Key words
methane/hydrogen/pressure oscillation/oscillation intensity/flame self acceleration引用本文复制引用
出版年
2024
NETL
NSTL
万方数据