摘要
利用高速摄像的方法,在狭缝间距为2,mm的圆盘状微型定容燃烧装置中考察了常温常压、当量比φ为1.0~1.6静止丙烷/空气预混气中心点火后向外传播的火焰传播特性.结果表明:微型定容燃烧腔内形成的火焰面有光滑、褶皱和断裂3种形态;光滑火焰面的火焰传播速度低于常规尺度下的火焰传播速度;火焰传播速度随着当量比的增加先增大后减小;在点火能量影响范围外,火焰传播速度随半径增大而减小;随当量比的增加火焰锋面容易出现褶皱和断裂现象.
Flame propagation characterisitcs of outwardly propagating flames were experimentally studied in a 2 mm gap disc-like micro chamber filled with equivalence ratios at φ=1.0—1.6 quiescent propane/air mixture ignited in the centre at atmospheric pressure and temperature by a high speed camera. The smooth,wrinkled and crack flame shapes are observed. The propagation speed of smooth flame was slower in the micro chamber than that in conventional combustion bomb. With the increase of equivalence ratio,flame speed increased firstly and then decreased. Beyond the influence of spark ignition stage,flame speed decelerated with the increase of chamber radius. The wrinkled even crack flames was prone to occur with the increase of equivalence ratio.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2016年第3期268-273,共6页
Transactions of Csice
基金
国家重点基础研究发展计划资助项目(2014CB239600)
国家自然科学基金资助项目(51336010
51176174)
关键词
微尺度燃烧
定容燃烧
火焰传播
火焰褶皱
micro combustion
constant volume combustion
flame propagation
flame wrinkles
