砂尘环境试验设备中颗粒浓度场的实验研究

利用中科院寒旱所沙漠研究所室内风沙环境风洞,采用激光粒子成像技术对砂尘环境试验设备中含砂气固两相射流在距喷嘴不同截面中心位置的颗粒浓度场进行了测量和分析研究,并与拍摄的颗粒空间分布数码照片进行对比.实验结果表明在距气固喷嘴约1?m处的截面上,砂粒颗粒还没有扩散到整个空间内,轴线附近的粒子较多,而且大粒子多数处于下部区域,只有在距喷嘴下游约3?m处粒子才基本扩散均匀,从而可确定砂尘环境试验中试件的安放位置.结论认为砂尘试验设备的加砂段应保持在3?m左右,这样才能满足国军标要求,从而为我国自行研制大型砂尘环境试验设备,确定加砂/尘方法、参数、加料和试验段尺寸等提供了依据.

Experimental study on particle concentration in sand and dust equipment

Using the desert wind tunnel Laboratory of Institute of Desert Research in CAREERI of CAS, and applying laser particle imaging technology, the sand particle concentration in the different section from solid-gas nozzle on solid-gas two phase flow was measured and researched and contrasted with the photograph in the equipment.The experimental results indicate that the sand particles can not diffuse the whole section that is about one meter horizontally from the sand orifice and there are all most particles in the tunnel axes, at the same time those greater particles occur below the axes, but they can just diffuse equably the whole space in the section about three meters horizontally form the orifice. The conclusion was reached that the size of supplying was about three meters to accord with our nation military standard and it provided the gist to develop ourselves sand and dust experimental equipment, to confirm the way and the parameter of supplying sand and dust and to design the size of the supplying andthe test segment.