科研之友
微信
新浪微博
Facebook
分享链接
摘要
To reduce the interior/exterior flow-induced noise in centrifugal pump as turbine (PAT), based on the relation between in-phase hydrodynamic action and radiated noise, the angle formula in ideal condition by individually leaning blade was proposed. Considering the joint leaning effect, the formulas associated with parallel- and counter-leaning blade and tongue were presented. The corresponding active noise reduction approaches were put forward without losing hydraulic performance. For noise simulation, the numerical method for interior noise and finite element model for casing structure were checked, with good agreements achieved. The boundary element method (BEM) and finite element method (FEM) were used to investigate the interior/exterior noise characteristics of PATs by varying the shapes of blade or tongue. Researches show that the interior noise due to casing source can reflect joint action of multiple sources. It is feasible to predict the interior noise induced only by casing source through BEM. The leaned blade can keep PAT's original performance, the leaned tongue can significantly improve the efficiency overall operating range with an increase from 0.67 % to 1.81 %, and the combined counter-leaning blade and tongue can increase the efficiency in larger flow rates. They can all reduce sound pressure level (SPL) at fundamental frequency and total sound energy, and the noise reduction effect under joint action is best.
- 出版日期2016-6
- 单位江苏大学
