【作者】 崔峰； 王希麟； 张会强；

【Author】 CUT Feng, WANG Xilin and ZHANG Huiqiang( Dep. Of Mech. Engineering, Tsinghua Univ., Beijing 100084, China; Dep, Of Mech. Engineering, Tsinghua Univ., Beijing 100084, China; Dep. Of Mech. Engineering, Tsinghua Univ., Beijing 100084, China)

【机构】 清华大学工程力学系；

【摘要】 本文通过流动显示实验研究了无扰动存在时的流动和有扰动存在时的流动。在无扰动情况下,实验比较了入口速度为1.4m/s,3.0m/s,4.8m/s,6.3m/s,8.5m/s时固体颗粒(实验选取直径为45μm的玻璃粒子)附着点的变化,发现无扰动时附着点的位置随气相入口速度的增加向下游移动。在有扰动存在的情况下,实验比较了在不同位置(L/H=-10,+2,+4,其中L代表距台阶的距离,“+”代表台阶下游,“-”代表台阶上游)加入气体射流扰动时固体颗粒附着点的变化,进一步比较了同一位置,不同大小(在实验中体现为射流流量的大小,选择了三种流量,分别是7.5m3/h,15m3/h,22.5m3/h)的扰动对固体颗粒附着点的影响。更多还原

【Abstract】 In present study, the effect of gas-injection disturbance on gas-particle flows over a backward facing step is visualized and recorded. The experiment includes two parts: with and without the disturbance of gas injection. (1) In the case of being without disturbance, the length of attachment region are compared by varying the velocity of free stream (Uo=1.27m/s, 3.0m/s, 4.8m/s, 6.3m/s, 8.5m/s). (2) In the case of gas injection into the backstep flow, the length of attachment are compared not only by varying the location of gas injection (L/H-10, 2, 4, in which L denotes the length from the step to the point that is measured), but also by changing the flux of the injected gas (Fi=7.5m3/h, 15.0m3/h,22.5m3/h).更多还原