加湿湍流燃烧火焰稳定的速度场特性分析

1引言目前,湿空气透平循环(HAT循环)等先进热力循环成为人们研究的重点。此类循环在提高效率和减少NOX排放量的同时,燃烧火焰的温度降低了,火焰将愈加不稳定,所以对加湿湍流燃烧火焰稳定的速度场等特性进行研究是非常有必要的。目前燃烧实验研究大多是基于激光诊断测量技术基础

Analysis of velocity fields characterization of flame stabilization in turbulent diffusion humid air combustion

An experimental research based on 2D PIV system bas been performed in this paper to measure instantaneous velocity fields of propane/air turbulent diffusion combustion in the unreactive flows,reactive flows,and humid air reactive flows.The velocity field vector diagrams and axial velocity contour diagrams have been acquired successfully in the flame zone.By contrast,we find that the length of recirculation zone is diminished appreciably on the humid air combustion condition.The flow velocities in the air main flows zone in the humid air combustion are lower than that of in no-humid air combustion.The velocity contours are sparse which illuminates that the gradient of velocities is reduced remarkable in the interfaces of the fuel and air.The results show the stabilization characteristic of the flames is somewhat affected by the humid.