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为探究横向射流对缓燃转爆震过程的影响,在高20mm,深6mm,总长为810mm的矩形通道内进行了横向射流加速起爆的单爆试验。采用甲烷和氧气的预混气为反应物,点火源为点火能量为50mJ的弱火花塞点火。垂直于主流的横向喷射孔径为1mm,喷射介质为与反应物同浓度的混气。试验主要研究射流延迟时间、射流位置、射流数量和射流分布形式对起爆特性的影响。结果显示,射流各喷射位置下均存在相应的最佳射流延迟喷射时间使得预混气的起爆时间最短。射流位置分别位于距点火区90mm、270mm处的平行双射流和90mm、180mm处的交错射流均具有最短的起爆时间约1ms。
In order to investigate the influence of transverse jet on the process of ignition and detonation, a single burst test of horizontal jet accelerated detonation was carried out in a rectangular channel with a height of 20mm, a depth of 6mm and a total length of 810mm. A premixed gas of methane and oxygen was used as the reactant. The ignition source was a weak spark plug with an ignition energy of 50 mJ. Vertical perpendicular to the mainstream jet diameter of 1mm, spray medium with the same concentration of reactant gas mixture. The experiment mainly studies the influence of jet delay time, jet position, jet number and jet distribution on initiation characteristics. The results show that there is a corresponding optimum jet lag injection time under each injection position of the jet to make the initiation time of the premixed gas be shortest. Jet positions are located at a distance of 90mm from the ignition zone, 270mm parallel double jets and 90mm, 180mm cross staggered jets have the shortest detonation time of about 1ms.