正丁醇预混层流燃烧试验

Experiment on premixed laminar combustion of n-butanol

基于定容燃烧弹,利用高速纹影摄影和球形火焰扩展法,分析了不同燃空当量比(0.7~1.6)、初始温度(400,430,460 K)、初始压力(0.1,0.2,0.3 MPa)对正丁醇-空气预混层流燃烧的影响.研究了正丁醇-空气层流燃烧速度、火焰传播速度和拉伸率等关键层流燃烧特性参数的变化规律.结果表明:随着燃空当量比的增加,火焰前峰面稳定性变差,火焰传播速度和无拉伸火焰层流燃烧速度均呈现先增加后减小的趋势;随着初始温度的增加,火焰传播速度和无拉伸层流燃烧速度均增加,火焰前峰面稳定性下降;随着初始压力的增加,无拉伸层流燃烧速度和火焰传播速度均减小,火焰前峰面稳定性变差;火焰前峰面拉伸率随拉伸火焰传播速度的增加而逐渐减小.

Based on the constant volume combustion bomb, the effects of equivalence ratio （0.7 - 1.6）, initial temperature （400, 430 and 460 K） and initial pressure （0.1, 0.2 and 0.3 MPa） on butanol-air premixed laminar combustion were investigated by the ball type flame extension method with high speed schlieren photography technology. Several key parameters of laminar combustion of laminar combustion velocity, flame propagation velocity and stretch rate were analyzed in detail. The results show that the stability of flame front becomes worse with the increasing of fuel-air equivalence ratio, while the flame propagation velocity and the laminar burning velocity of unstretched flame are increased firstly with latter decreaseing. Both the flame propagation velocity and the unstretched laminar burning velocity are increased with the increasing of initial temperature, while the stability of flame front is decreased. The unstretched laminar burning velocity and the flame propagation velocity are decreased with the increasing of initial pressure, and the stability of flame front is deteriorated. In addition, the elongation of flame front surface is decreased with the increasing of flame propagation velocity.