气固两相自由射流颗粒弥散实验研究综述

Progress in Experimental Investigations on Gas Solid Two-phase Free Jets

本文为水平浓淡煤粉燃烧技术研发基础工作之一。以双矩形气固两相平行射流为研究背景,作者考察了气固两相平面和圆自由射流的实验研究。综述表明,大涡拟序结构的存在和初始条件对自由射流颗粒弥散的影响是关键的,利用St数可定性估计这种影响,颗粒尺寸和负荷对气固两相流场的湍流结构具有显著影响,大颗粒尾涡脱落显著地影响湍流结构的事实使数值模拟气固两相流动的努力面临着模拟方法选择与指导工程设计的矛盾要求。因此,数值模拟技术需要评估,这是继续的工作。

This review is part of the horizontal bias pulverized coal combustion R＆D plan and technological ba- sis of the further study on dual rectangular parallel gas solid two - phase jets. Authors investigate experimental works on the gas solid two - phase fluid flow of planar and round jets. The review showes that effects of large eddy orderly structure and initial conditions on the particle dispersion of gas solid two - phase free jets are dominant. The effect could be estimated with the St number. Particle size and particle load play important roles in determining gas solid two - phase turbulent properties, and numerical simulation on gas solid two - phase planar or round jets has to face the challenge of determining simulation method and guiding engineering design because of the fact that the influence of wake eddy shedding of large particle flow on turbulence struc- ture is sometimes the key message which should be expressed in mathematical models. The numerical simula- tion technology should be estimated, the following papers will present our works in detail.