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铸造铜合金舰船螺旋桨断裂事故分析 被引量:2
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作者 赵九夷 《特种铸造及有色合金》 CAS CSCD 北大核心 2010年第11期997-1001,共5页
我国从1969年开始生产大型整铸铜合金螺旋桨,由于生产经验不足,质量管理不够完善,曾发生多起断桨事故。分析了事故发生的原因,论述了铸造缺陷、成分偏析、合金性能和金相组织对铜合金螺旋桨使用寿命的影响。为提高产品的质量,保证航行安... 我国从1969年开始生产大型整铸铜合金螺旋桨,由于生产经验不足,质量管理不够完善,曾发生多起断桨事故。分析了事故发生的原因,论述了铸造缺陷、成分偏析、合金性能和金相组织对铜合金螺旋桨使用寿命的影响。为提高产品的质量,保证航行安全,就其铸造工艺、设计方法和材料选用以及质量管理、验收规则等提出了改进意见,并提出了相应的防断措施。 展开更多
关键词 铸造铜合金 螺旋 断桨
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Low Dissipation Simulation for Vortex Flowfield of Rotor in Hover Based upon Discontinuous Galerkin Method
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作者 BIAN Wei ZHAO Qijun ZHAO Guoqing 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第6期975-983,共9页
The discontinuous Galerkin(DG) method is established and innovatively conducted on accurately simulating the evolution of blade-tip vortex and the aerodynamic characteristics of helicopter rotor. Firstly,the Reynolds-... The discontinuous Galerkin(DG) method is established and innovatively conducted on accurately simulating the evolution of blade-tip vortex and the aerodynamic characteristics of helicopter rotor. Firstly,the Reynolds-Averaged Navier-Stokes(RANS)equations in rotating reference frame are employed,and the embedded grid system is developed with the finite volume method(FVM)and the DG method conducted on the blade grid and background grid respectively. Besides,the Harten-Lax-Van Leer contact(HLLC)scheme with high-resolution and low-dissipation is employed for spatial discretization,and the explicit third-order Runge-Kutta scheme is used to accomplish the temporal discretization. Secondly,the aerodynamic characteristics and the evolution of blade-tip vortex for Caradonna-Tung rotor are simulated by the established CFD method,and the numerical results are in good agreement with experimental data,which well validates the accuracy of the DG method and shows the advantages of DG method on capturing the detailed blade-tip vortex compared with the FVM method. Finally,the evolution of tip vortex at different blade tip Mach numbers and collective pitches is discussed. 展开更多
关键词 blade-tip vortex discontinuous Galerkin(DG)method Navier-Stokes(N-S)equations aerodynamic characteristics helicopter rotor
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