矿用潜水电泵性能正交试验

以煤矿排水用的BQS20—40—5．5型固液两相流潜水电泵为例，选择对泵性能影响较大的3个因素叶片进口冲角、叶片出口安放角和叶片数，对3个因素分别取3个水平，采用L9（3^4）正交表，得到9种试验方案．在计算流体动力学软件Fluent中采用标准k—ε湍流模型和SIMPLE算法，对正交试验中9种方案分别进行单相清水模拟和固液两相流模拟，并对模拟结果进行极差值计算，得到因素与效率指标的直方图．结果表明，叶片出口安放角和叶片数在清水模拟和两相流模拟的最优方案中取值不同，小固体颗粒在叶轮内集中分布于叶片工作面，并沿工作面向外运动，在叶轮出口处以很小的出口角流出，部分颗粒会在叶片出口处与叶片工作面相撞，加剧叶片磨损．因此在设计固液两相流泵叶轮时，叶片出口安放角不易过大．采用两相流理论对BQS20—40—5．5型泵进行优化设计，在设计工况下，泵效率高于国家标准的规定值，叶轮磨损有较大改善，提高了泵运行寿命．

Orthogonal experiment on performance of submersible mining pump

Taking a BQS20 - 40 - 5.5 pump commonly used in coal mine draingage as a case, three main factors, including inlet blade attack angle, outlet blade angle and blade number, were chosen to carry out orthogonal test. Nine test schemes were acquired by choosing three levels to the parameters stated above by using L9 （3^4） orthogonal table. By using SLMPLE algorithm and standard k -ε turbulence model, single phase pure water and solid-liquid two-phase flow simulations were carried out according to the nine schemes defined by orthogonal test. The relationship between efficiency and factors were got through range value calculation for simulation results. The results show that the outlet blade angle and blade number are different in single phase pure water and solid-liquid two-phase flow simulations. It can be seen that small solid particles concentrated on the impeller pressure side, move to the out peripheral along the pressure side, and discharge at the impeller outlet with a small flow angle. Some particles in the departure of the impeller pressure side collide with the blades pressure side, and increases the impeller erosion. Therefore, the outlet blade angle should not be too large in the design of solid-liquid two-phase flow pump. When the two phase theory was applied in the optimization design of BQS20 - 40 - 5.5 pump, the design point efficiency is higher than the national standards, the wear of the impeller and the operational life of the pump are greatly improved.