基于分离涡模拟的对转舵桨水动力性能数值分析
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摘要
基于OpenFOAM软件平台,采用改进的延迟分离涡模拟(IDDES)模型,结合滑移网格方法,对一组对转桨和对转舵桨的水动力性能进行数值预报,并利用快速傅里叶变换(FFT)对推力系数进行频谱分析。对转桨数值计算结果与模型试验结果比较,推力、扭矩系数以及推进器效率的误差分别在3%、2%和5%左右,验证了该数值方法的可行性。对转舵桨数值计算结果提示:压差阻力是吊舱和立柱阻力的主要成分,在立柱的前端存在回流,对立柱的优化设计可以从这两方面入手;立柱和吊舱的存在能够减小轴承力导致的振动。
The hydrodynamic performances of a contra-rotating propeller and a contra-rotating rudder propeller are predicted by using the improved delay detached-eddy simulation(IDDES) model and sliding mesh method based on the OpenFOAM software. The thrust coefficients are analyzed by the fast Fourier transform(FFT)method. The numerically calculated thrust coefficients, torque coefficients and propulsion efficiencies of the contra-rotating propeller are compared with the model test results with the errors of 3%, 2% and 5%, respectively,indicating the validity of the numerical method. The numerical results of the contra-rotating rudder propeller show that the pressure drag is the main component of the drag of the pod and strut, and there is a reverse flow at the front of the strut. The strut, therefore, can be optimized from the two aspects. The strut and the pod can also reduce the vibration caused by the bearing force.
The hydrodynamic performances of a contra-rotating propeller and a contra-rotating rudder propeller are predicted by using the improved delay detached-eddy simulation(IDDES) model and sliding mesh method based on the OpenFOAM software. The thrust coefficients are analyzed by the fast Fourier transform(FFT)method. The numerically calculated thrust coefficients, torque coefficients and propulsion efficiencies of the contra-rotating propeller are compared with the model test results with the errors of 3%, 2% and 5%, respectively,indicating the validity of the numerical method. The numerical results of the contra-rotating rudder propeller show that the pressure drag is the main component of the drag of the pod and strut, and there is a reverse flow at the front of the strut. The strut, therefore, can be optimized from the two aspects. The strut and the pod can also reduce the vibration caused by the bearing force.
引文
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[2]祝志超,熊鹰.基于CFD预报双桨式吊舱推进器水动力性能[J].舰船科学技术,2016(5):14-19.
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[2]祝志超,熊鹰.基于CFD预报双桨式吊舱推进器水动力性能[J].舰船科学技术,2016(5):14-19.
[3]张涛,杨晨俊,宋保维,等.对转桨非定常性能的CFD模拟(英文)[J].船舶力学,2011(6):605-615.
[4]王展智,熊鹰.Effect of Time Step Size and Turbulence Model on the Open Water Hydrodynamic Performance Prediction of Contra-Rotating Propellers[J].中国海洋工程(英文版),2013(2):193-204.
[5]WILCOX D C.Turbulence Modeling for CFD[M].California,DCW Industries,Inc.1993:436.
[6]SPALART P R,DECK S,SHUR M,et al.A new version of detached-eddy simulation,resistant to ambiguous grid densities[J].Theoretical and Computational Fluid Dynamics,2006,20:181-195.
[7]TRAVIN A K,SHUR M,SPALART P,et al.Improvement of delayed detached-eddy simulation for LES with wall modelling[C]//Proceedings of the European Conference on Computational Fluid Dynamics“ECCOMAS CFD2006”,TU Delft,The Netherlands:2006.
[8]SHUR M,SPALART P,STRELETS M K,et al.A hybrid RANS-LES approach with delayed-DES and wallmodeled LES capabilities[J].International Journal of Heat and Fluid Flow,2008,29:1638-1649.
[9]MILLER M L.Experimental Determination of Unsteady Forces on Contrarotating Propellers in Uniform Flow[R].Bethesda:Ship Performance Departmental Report,David W Taylor Naval Ship R&D Center,1976.
[10]HUNT J C R,WRAY A A,MOIN P.Eddies,Streams and Convergence Zones in Turbulent Flows[R].Cambridge:Center for Turbulence Research Report,1988.
[11]STRASBERG M,BRESLIN J P.Frequencies of the alternating forces due to interactions of contrarotating propellers[J].Journal of Hydro-nautics,1976(2):62-64.