浮力对炉内流场的影响

INFLUENCE OF BUOYANCY ON FLOW PROFILE IN COMBUSTION CHAMBER

建立了包含浮力影响的ＡＳ－Ｆ模型，在计入与忽略浮力影响的情况下，模拟大型电站锅炉炉内流场。试验结果表明，在计入浮力影响后，燃烧器中心回流区缩短，炉膛后墙附近轴向速度衰减加快，炉内整个流场也发生相应变化。因此，在热态炉内过程模拟时，计入浮力的影响是很有必要的。

A AS - F model has been established,by means of which the flow Profile can be modelled with or without consideration of buoyangcy.Tests show,that with consideration of buoyangcy the recirculation zone in burner flame will be reduced,the axial valocity at the rear wall will be attenuated more quickly and the the whole flow profile in furnace varies in. comparison with the case without consideration of buoyangcy.Therefore,it is necessary to take into consideration the buoysngcy in modelling the process in combustion chamber in hot state.