梭锥管混浊流体分离装置转角优化数值模拟研究  

Numerical Simulation of Optimization of Rotation Angle of Turbid Fluid Separation Device Shuttle Conical Tube

作　　者：李琳[1] 王苗[2] 靳晟[3] 

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [2]新疆农业职业技术学院工程分院,新疆昌吉831100 [3]新疆农业大学计算机与信息工程学院,新疆乌鲁木齐830052

出　　处：《水电能源科学》2015年第6期158-162,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51009117);新疆水利水电工程重点学科基金项目(xjzdxk-2002-10-05)

摘　　要：基于PIV实测的梭锥管内水沙两相流场的流速资料,对拟采用的数学模型及其参数进行了试算和比较,选出符合梭锥管内水沙两相流动的数学模型及其参数。建立了10种不同转角的梭锥管模型,模拟计算了泥沙平均粒径为0.045mm、含沙浓度为5kg/m3时各梭锥管内部的泥沙浓度和速度场,对比分析了不同转角下梭锥管内的速度场和浓度分布特性。结果表明,经过相同时间分离并沉降至梭锥管底部的泥沙平均体积分数值随转角的增大先增后减,在40°<α<45°范围内达到峰值,水沙分离效率最高;靠近清水溢流口附近的泥沙浓度随转角的增大先减后增,在40°<α<45°范围内达到最小值,即在该角度范围内,随水流上升的泥沙量最少,溢出水流的含沙量最低。The mathematical models and its parameters that would be adopted were given trial calculation and com- pared based on the experimental data of velocity in water-sediment two-phase flow of shuttle conical tube measured by particle image velocimetry （PIV）. The mathematical model and its parameters which were suitable for the water-sediment two phase of shuttle-conical tube can he chosen. Ten different angles of shuttle conical tube model were established. And then the sediment concentration and velocity field were calculated with numerical simulation when the average diameter of sediment was 0. 045 mm and silt content concentration of muddy water was 5 kg/m^3. Finally, the characteristics of veloc- ity field and concentration distribution were compared and analyzed under the different angles. The results show that the sediment average volume fraction which separates and settles to the bottom of shuttle-conical tube after the same time in- creases at first, then decreases with the increase of the angle, and it reaches the peak at 40°〈α〈45°, the highest efficien- cy of water and sediment separation can be obtained at this time. The sediment concentration which closes to the overflow port of clear water decreases at first, then increases with the increase of the angle, and it reaches the minimum value at 40°〈α〈45°, namely within the limits of this angle, the quantity of sediment that upward with the flow is the fewest and the sediment concentration that overflow is the minimum.

关 键 词：水沙分离 数值模拟 水沙两相流 PIV 

分 类 号：TV131[水利工程—水力学及河流动力学]