引射吸水室对离心泵性能的影响

Influence of jetting suction chamber on performance of centrifugal pumps

以IS100-80-160离心泵为模型载体,提出一种引射吸水室离心泵。基于RNG k-ε湍流模型对不同引射参数下离心泵内部流场进行数值模拟,研究引射口直径和引射角度对离心泵汽蚀及水力性能的综合影响,并对数值计算模型进行实验验证。研究结果表明：在设计工况下,随着引射口直径的增大,泵汽蚀余量先减小后增大,扬程和效率略有下降;当引射口直径为3 mm时,引射吸水室的增压效果最好,泵汽蚀性能最佳;随着引射角度的增大,泵汽蚀余量逐渐增大,扬程和效率略微下降,合理的引射角度为15°~30°;实验与数值模拟结果的变化趋势相吻合,验证了数值模拟的准确性。

Taking IS100-80-160 centrifugal pump as a model-carrier, a jetting suction chamber centrifugal pump was proposed. Based on RNG k-ε turbulence model, a numerical simulation was performed for studying the internal flow under the condition of different ejector parameters, and for revealing the comprehensive influence of ejector port diameter and ejector angle on the performance of centrifugal pumps. Then the experiment was conducted to verify the correctness of numerical simulation. The results show that under the designed condition, the net positive suction head decreases first and then increases with the increase of ejector port diameter, and the head and efficiency are incremental slightly. Pressurizing effect of jetting suction chamber and centrifugal pump cavitation performance are best when the ejector port diameter is 3 mm. With the increase of ejector angle, the net positive suction head increases gradually, and the head and efficiency decrease slightly. The optimum range of ejector angle is 15°-30°. The changing trend of experimental results is consistent with numerical simulation results, which indicates the accuracy of the numerical simulation.