钝体后回流流场传热特性的实验研究

An Experimental Investigation on the Heat Flux Distribution in the Recirculating Flow Zone behind a Bluff-Body

在测量钝体后回流流场的速度、脉动速度相关量和温度的基础上，求出回流流场的热通量分布。结果表明了热通量分布与脉动相关量间的密切相关性，以及回流区及其边界区域相对强烈的热交换强度，这些结果有助于理解钝体后回流区在燃料燃烧火焰稳定中的显著作用。

The heat flux distribution in the recirculating flow zone behind a bluff-body has beenmeasured. The distributions of the velocity , the correlative fluctuation of velocity and thetemperature are measured respectively with a back-to-back pitometer and a single hot-wiremeter as well as a fine wire thermocouple. The velocity gradient and temperature gradientare obtained from fitting the experimental data with the cubic spline function. Then the heatflux distribution in the recirculating flow zone is calculated with the turbulent flow theoryand the energy differential equation of the flow field based on the experimental data. The re-suIts show that the diffusion heat flux is closely related to the correiative fluctuation of ve-locity and heat exchange intensity is relatively great in the recirculating flow zone.