导管桨方位推进器无空化噪声数值预报研究
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摘要
为了准确计算导管桨方位推进器水下辐射噪声,文章以非均匀进流条件下实尺度导管桨方位推进器为研究对象,采用扇声源方法结合边界元方法对导管桨方位推进器无空化噪声进行了数值预报,并分析了导管桨方位推进器不同部件噪声对总噪声的贡献。结果表明:壁面脉动压力幅值最强位置主要集中在桨叶的导边以及导管内壁面靠近桨叶叶梢的部分;径向测点声源级最大值对应的频率为叶频,轴向测点噪声在三倍叶频处声源级最大;静止部件噪声是径向测点噪声的主要贡献者,旋转部件噪声是轴向测点噪声的主要贡献者;导管桨方位推进器总噪声对应的宽带声源级指向性呈椭圆形;采用扇声源方法结合边界元方法能够预报导管桨方位推进器无空化噪声,为导管桨方位推进器的噪声性能评估提供一个新方法。
In order to numerically calculate duct azimuth thruster noise precisely,taking the duct azimuth thruster with full size under non-uniform flow as object,the non-cavitating noise of duct azimuth thruster is predicted by fan noise model in the frequency domain combined with boundary element method.The contribution of different parts to total noise of duct azimuth thruster is studied.The results show that pressure fluctuation of the blade leading edge and duct interior wall near blade tip are stronger than those of other parts.The strongest acoustic source level of radial field point is at blade passing frequency(BPF),while the strongest acoustic source level of axial field point is at 3 BPF.The strongest acoustic source level of rotating component is in axial,while the strongest acoustic source level of stationary component is in radial.The directivity of wide band sound source level of total noise of duct azimuth thruster is an ellipse.The noncavitating noise of duct azimuth thruster can be obtained by fan noise model in the frequency domain combined with boundary element method,which provides a new method to assess acoustic performance of duct azimuth thruster.
In order to numerically calculate duct azimuth thruster noise precisely,taking the duct azimuth thruster with full size under non-uniform flow as object,the non-cavitating noise of duct azimuth thruster is predicted by fan noise model in the frequency domain combined with boundary element method.The contribution of different parts to total noise of duct azimuth thruster is studied.The results show that pressure fluctuation of the blade leading edge and duct interior wall near blade tip are stronger than those of other parts.The strongest acoustic source level of radial field point is at blade passing frequency(BPF),while the strongest acoustic source level of axial field point is at 3 BPF.The strongest acoustic source level of rotating component is in axial,while the strongest acoustic source level of stationary component is in radial.The directivity of wide band sound source level of total noise of duct azimuth thruster is an ellipse.The noncavitating noise of duct azimuth thruster can be obtained by fan noise model in the frequency domain combined with boundary element method,which provides a new method to assess acoustic performance of duct azimuth thruster.
引文
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[12]王之程,陈宗岐,于渢,等.舰船噪声测量与分析[M].北京:国防工业出版社,2004.
[2]Igeta M,Yuan H B.Development and performance estimates of a ducted tandem CRP[C]//Third International Symposium on Marine Propolsors.Tasmania,Australia,2013.
[3]Fisher R.Bow thruster induced noise and vibration[C]//Dynamic Positioning Conference.Houston,USA,2000.
[4]Funeno I.Hydrodynamic optimal design of ducted azimuth thrusters[C]//First International Symposium on Marine Propulsors.Trondheim,Norway,2009.
[5]Park J H,Chung K N,Chang B J,et al.A study of hydraulic design of a ducted azimuth thruster[C]//Proceedings of the ASME 2012 Fluids Engineering Summer Meeting.Rio Grande,Puerto Rico,2012.
[6]Pacuraru F,Lungu A,Ungureanu C,et al.Numerical simulation of the flow around a steerable propulsion unit[C]//25th IAHR Symposium on Hydraulic Machinery and Systems.Timisoara,Romania,2010.
[7]Cozijn J L,Hallmann R.The wake flow behind azimuthing thrusters:measurements in open water,under a plate and under a barge[C]//Proceedings of the ASME 2012 31st International Conference on Ocean,Offshore and Arctic Engineering.Rio de Janeiro,Brazil,2012.
[8]Cozijn J L,Hallmann R.Thruster-interaction effects on a dp shuttle tanker-wake flow measurements of the main propeller and bow tunnel thrusters[C]//Proceedings of the ASME 2014 33rd International Conference on Ocean,Offshore and Arctic Engineering.San Francisco,California,USA,2014.
[9]Choi H L,Duck J L.Development of the numerical method for calculating sound radiation from a rotating dipole source in an opened thin duct[J].Journal of Sound and Vibration,2006(295):739-752.
[10]Vaz G.Modelling of sheet cavitation on hydrofoils and marine propellers using boundary element methods[D].Portugal:Universidade Tecnica de Lisboa,2005.
[11]付建,王永生.基于点源模型的螺旋桨负载噪声频域预报[J].华中科技大学学报(自然科学版),2014,42(4):77-80.Fu Jian,Wang Yongsheng.Predicting the loading noise of propeller based on point source model in frequency domain[J].J Huazhong Univ.of Sci.&Tech.(Natural Science Edition),2014,42(4):77-80.
[12]王之程,陈宗岐,于渢,等.舰船噪声测量与分析[M].北京:国防工业出版社,2004.