摘要
为了提高离心泵的汽蚀性能,基于喷射原理,以IS100-80-160离心泵为研究对象,通过设计不同喷射管数及引流管径的引射吸水室,采用RNG k-ε湍流模型对离心泵内部流场进行数值模拟。为了验证数值计算结果的准确性,通过离心泵闭式性能实验台对带有不同引射吸水室结构的模型泵进行性能实验。研究结果表明:随着喷射管数的增多,泵汽蚀余量先减小后增大,扬程和效率略有下降,当8个喷射管均布时,引射吸水室的增压效果最好,泵汽蚀性能改善效果显著;随着引流管径的增大,泵汽蚀余量先减小后增大,当引流管径为17 mm时泵汽蚀余量最小,扬程和效率与引流管径成反向变化趋势;实验结果与数值计算结果具有较好的一致性,泵汽蚀余量的最大差值为0.19 m。
To improve the cavitation performance of centrifugal pumps, the centrifugal pump IS100-80-160 was taken as a research subject based on the jet principle by designing the injector suction chamber with different numbers of injection tubes and different diameters of return pipe. And the numerical simulation was performed to study the internal flow field of centrifugal pump based on RNG k-ε turbulence model. In order to verify the accuracy of numerical simulation results, the experiments were done by taking model pumps with different injector suction chamber structures in closed performance test-bed for centrifugal pumps. The results show that the centrifugal pump net positive suction head decreases first and then increases, and the head and efficiency decrease slightly. The injector suction chamber pressurizes best and pump cavitation performance is significantly improved when 8 injection tubes evenly distribute.With the increase of the diameter of return pipe, centrifugal pump net positive suction head initially decreases and then increases and reaches the minimum when the diameter of return pipe equals 17 mm, and the head and efficiency vary reversely with the diameter of return pipe. The experimental results match consistently with numerical results, and the maximum deviation of net positive suction head is 0.19 m.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第6期1916-1923,共8页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51476144
51305399)
浙江省自然科学基金资助项目(LQ15E050005
LQ15E090004)~~
关键词
引射吸水室
喷射管数
引流管径
数值模拟
injector suction chamber
number of injection tube
diameter of return pipe
numerical simulation
