【摘要】 采用控制变量法进行工况设计,对多孔管进行数值模拟和试验对比,分别研究多孔管管径、管长、孔径、孔间距和水压5个变量对多孔管孔出流速度和流量的影响。使用ANSYS软件中的Design Modeler模块进行几何建模,采用ICEM中的O-Block技术进行流体计算域网格划分,利用Fluent软件进行求解。研究发现:多孔管管径和管长增加均会使孔出流速和出流量减小,管长增加会影响孔出流沿程的均匀性;孔径增大会使孔出流速明显减小,且影响孔出流沿程的均匀性,出流量受孔径的影响比较复杂,在孔径不超过2.5mm时,可认为出流量与孔径的平方成正比;孔间距增大对孔出流速和沿程均匀分布基本无影响,与出流量成正比。将数值模拟结果与试验结果相对比,发现试验数据反映的多孔管出流量与管径、管长、孔径和孔间距的关系与数值模拟结果基本吻合,而试验中管的出流量普遍比数值模拟结果小。更多还原

【Abstract】 In this paper, through the control variable method for the working condition design, numerical simulation and experimental comparison of porous pipe, respectively, the influence of five variables of porous pipe diameter, pipe length, pore diameter, hole spacing and water pressure on the outlet velocity and flow rate of porous pipe was studied. Geometric modeling was carried out by using the Design Modeler module in ANSYS software, the fluid computing domain grid was divided by o-block technology in ICEM, and Fluent software was used for solution. It is found that the increase of the inner diameter and the length of the porous pipe leads to the decrease of the orifice flow rate and the orifice flow rate. The increase of pore diameter significantly reduces the outlet flow rate, and affects the uniform distribution of the outlet flow along the path. The outlet flow rate is more complex under the influence of pore diameter. When the pore diameter is less than 2.5 mm, it can be considered that the outlet flow rate is proportional to the square of pore diameter. The increase of hole spacing has no effect on the flow rate and uniform distribution along the hole, but is directly proportional to the flow rate. Finally, by comparing the numerical simulation results with the test results, it is found that the relationship between the outlet flow rate of the porous pipe reflected by the test data and the inner diameter, length, diameter and spacing of the pipe is basically consistent with the numerical simulation, while the outlet flow rate of the pipe in the test is generally smaller than that of the numerical simulation.更多还原