旋风集尘器外旋流区与内旋流区的流场分布

Flow Field Distribution in Outer Vortex Area and Inner Vortex Area of Vortex Cyclone Dust Collector

研究了内旋流加速旋风集尘器外旋流区和内旋流区的流场分布，测量出各旋流区的速度，推导出流场分布的空间向量。实验表明，流场切向速度的分布形式为沿半径方向递减的准自由涡，准自由涡指数为０．５，外旋流区的最小切向速度１５ｍ／ｓ，内旋流区的最小切向速度３２ｍ／ｓ，外旋流区和内旋流区上端轴向速度的分布形式为指数分布，最大轴向速度分别为４．９２ｍ／ｓ和５．５７ｍ／ｓ；内旋流区下端的轴向速度在与中心旋流的交汇处为０，并沿径向以指数递增；各旋流区的径向速度较小，方向向心。

Inner vortex speeding cyclone collector is very different from traditional cyclone dust collector in the structure. The flow field distribution and the dust separating procedure are different too. The separation areas are divided into different areas, such as outer vortex area,inner vortex area, mixing vortex area and central vortex area. The inner vortex area is divided into two parts: upper part and lower part. The bound form of the flow structure and the dust separation are similar to the outer vortex area. This paper investigated the flow field distribution of the inner vortex speeding cyclone dust collector both in outer vortex area and in inner vortex area.The airflow velocity was measured and the three dimension vector of the flow field distribution was derived. The test results showed that:1)tangent velocity distribution of flow field is quasi free vortex,index of the quasi free vortex is 0.5, the minimum tangential velocity is 15 m/s in the outer vortex area and 35 m/s in the inner vortex area;2)the axes velocity distribution is index form in the outer vortex area and in the upper part of the inner vortex area,the maximum axes velocities are 4.92 m/s and 5.57 m/s respectively, and the axial velocity in lower part of the inner vortex area increases along the radial direction;3)radial velocities in both outer and inner vortex arial are centripetal and very small.