The College of Information, Mechanical and Electrical Engineering, Shanghai Normal University, Shanghai, China.
Institute of Process Equipment, Zhejiang University, Hangzhou, China.
PLoS One. 2020 Feb 3;15(2):e0228051. doi: 10.1371/journal.pone.0228051. eCollection 2020.
Achieving an optimal configuration of the diffuser is indispensable for high pump performances. In this work, a numerical study on diffuser configuration is conducted for a high pump performance using a computational fluid dynamics code, and the effects of the wrap angle and the relative position of the diffuser vane to the impeller on pump performances are included. The results indicate that the modified diffuser with a suitable wrap angle may improve the pump hydraulic efficiency and the head by approximately 4% and 8%, respectively, while a suitable position of the diffuser vane can enhance the pump head by more than 4%. Meanwhile, the pressure recovery coefficient and the local Euler head of the diffuser are adopted to evaluate the diffuser performance. For a high pump performance, the local Euler head of the diffuser has a peak value at the leading edge with the change rate of zero along the meridian streamline, meaning that no blade loading at the leading edge of the diffuser guarantees a better match between the impeller and the diffuser.
实现扩散器的最佳配置对于提高泵的性能是必不可少的。在这项工作中，使用计算流体动力学代码对扩散器的配置进行了数值研究，以实现高泵性能，并包括了扩散器叶片的包角和相对位置对泵性能的影响。结果表明，具有合适包角的改进型扩散器可以分别提高泵水力效率和扬程约 4%和 8%，而扩散器叶片的合适位置可以提高扬程超过 4%。同时，采用扩散器的压力恢复系数和局部欧拉扬程来评估扩散器性能。对于高泵性能，扩散器的局部欧拉扬程在前缘处具有峰值，沿子午线流线的变化率为零，这意味着在扩散器的前缘处没有叶片负载可以保证叶轮和扩散器之间更好的匹配。
