%0 Journal Article
%T 动态分离器内部流场的测量
%A 张海
%A 张红霞
%A 王玉召
%J 洁净煤技术
%D 2019
%X 基于PIV技术,采用角位移传感器和内窥镜头,测量了带静态导流叶栅的动态分离器内分离区域的流场。气流在静叶栅外的环形区域呈强湍流旋转流动,叶轮转速对该区域的流场几乎没有影响。气流在静叶内呈涡流流动,涡心位置随叶轮转速提高逐渐向后移动,区域位置越低,涡心离叶片背风面越近,涡越扁长。在静叶栅和叶轮之间的区域,气流随叶轮做旋转运动,叶轮转速越高气流旋转越强。在动叶内,气流沿流道呈均匀流动,气流流动方向与叶片之间的夹角随叶轮转速提高而增大。动态分离器内的气固分离分为三级分离:第1级是静叶栅外环形区域的离心分离,该级分离作用几乎不受叶轮转速的影响;第2级为静叶内的撞击分离和旋涡分离;第3级分离发生在叶轮入口区域,既有离心分离,又有撞击分离,叶轮转速对后两级的分离作用有较大影响。 The flow field in the separation area of the dynamic separator with static guide cascade was measured by angular displacement sensor and endoscope head based on PIV technology.The airflow shows a strong turbulent rotational flow in the annular region outside static cascade,and the impellerspeed has little effect on the flow field in this area.The airflow presents a vortex flow in the stator blade,the vortex center position moves backward gradually with the increase of impeller rotate speed.The lower the regional position is,the closer the vortex center is to the leeward of the blade,and the longer the vortex is.In the region between the static cascade and the impeller,the airflow rotates with the impeller,and the higher the impeller speed of impeller,the stronger the airflow rotates.In the rotor blade,the airflow flows evenly along the runner,and the angle between the flow direction of the airflow and the blade increases with the increase of impeller speed.The gas-solid separation in the dynamic separator is divided into three stages,the first stage is the centrifugal separation in the annular region outside the static cascade,the separation effect of this stage is hardly affected by the impeller speed,the second stage is the vortex separation and impact separation in the static blade,and the third stage separation occurs in the impeller inlet area,which includes centrifugal separation and impact separation.The impeller speed has a great influence on the separation of the latter two stages
%K 动态分离器
%K 流场测量
%K PIV
%K 角位移传感器
%K 内窥镜头
%K 分离机理 dynamic separator
%K flow field measurement
%K PIV
%K angular translation sensor
%K endoscopic head
%K separation mechanism
%U http://www.jjmjs.com.cn/WKD/WebPublication/paperDigest.aspx?paperID=a24a1946-df73-4504-935c-501d18cf8b35