中文摘要：

为降低离心泵反转作液力透平流体诱发的内外场噪声,基于倾斜程度由叶片和隔舌分摊的思想,建立了理想情况下叶片与隔舌异向倾斜角度关系式,提出了在保证性能前提下联合倾斜叶片与隔舌的主动控制降噪方法。在验证内场噪声计算方法和壳体结构有限元模型的基础上,分别基于声学边界元法（Boundary Element Method,BEM）和声学有限元的自动匹配层技术（Finite Element Method/Automatically Matched Layer,FEM/AML）对3组不同倾斜角度透平进行了内外场噪声数值研究,分析倾斜隔舌以及联合倾斜叶片与隔舌的降噪效果。结果表明：隔舌倾斜一定角度后,透平效率在全流量范围内均增加,增加幅度约为0.67%-1.81%;同时倾斜叶片与隔舌后,透平效率与常规透平基本相同,大流量效率有小幅增加。单纯倾斜隔舌透平总声压级降低3.86%-5.93%,总声功率级降低0.83%-11.34%;在倾斜叶片和隔舌的联合作用下透平总声压级降低4.45%-7.19%,总声功率级降低1.08%-12.15%,联合作用的降噪效果更佳。

英文摘要：

Aiming at reducing fluid‐induced noise in interior/exterior noise of centrifugal pump as turbine （PAT） ,based on the blade and tongue′s paying their leaning share ,the angle formula associated with counter‐leaning blade and tongue in ideal condition was derived .Meanwhile ,the noise‐reduction active‐control approach was put forward by joint leaning blade and tongue ,without losing hydraulic performance .In the validation of calculation method of interior noise and finite element model of casing structure ,the boundary element method （BEM ） and finite element method/automatically matched layer technology （FEM/AML） was respectively used to study interior and exterior noise for three PATs by varying the shape of tongue .The noise reduction effects by leaning tongue as well as joint leaning blade and tongue were subsequently analyzed .Researches show that the leaned tongue can significantly improve PAT′s efficiency over an overall flow range ,with an increase of 0 .67% -1 .81% .While ,PAT′s original performance can be maintained by joint leaning blade and tongue ,with a slight increase in larger flow rates .Simply by leaning tongue ,the total sound pressure level of PAT can be reduced by 3 .86% -5 .93% ,and the total sound power level can be lowered by 0 .83% -11 .34% .Under the joint action ,the total sound pressure level is reduced by 4 .45% -7 .19% ,and the total sound power level is lowered by 1 .08% -12 .15% .The noise reduction effect of joint action is better .