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煤气燃烧过程是喷射流体抽吸空气两次进风紊流掺和、伴随着质、热传递的过程,流场结构极其复杂,燃烧器混合流场的理论研究包括:①从喷嘴出发,一次及二次进风紊流混合过程;②二次进风后煤气与空气在热管的混合;③炉头混合气体的燃烧过程.本文着重研究前两部分,介绍紊流方程组及其封闭条件,并讨论其应用前景.煤气燃烧喷射流体从喷嘴喷出,为有限空间约束射流,由于流速较低,喷射流体和经过两次进风进入热管至炉头前的混合流体.可假设为①是不可压缩的;②稳定轴对称流动;③流
The process of gas combustion is the turbulent mixing of the intake air into the air twice by the jet fluid. With the process of mass and heat transfer, the structure of the flow field is extremely complicated. The theoretical research on the mixed flow field of the combustor includes: (1) Secondary air turbulence mixing process; ② after the second intake air mixture of gas and air in the heat pipe; ③ burner combustion process.This paper focuses on the first two parts, introducing the turbulence equations and their closure conditions, and Discussing its application prospects.Gas combustion jetting fluid is jetted from the nozzle to confine the jet to a confined space due to the low velocity of the jet fluid and the mixed fluid entering the heat pipe to the front of the burner after two air inlets. ; ② steady axis symmetrical flow; ③ flow