Dynamics and vibration of control valves under flow-induced vibration are analyzed. Hydrodynamic load characteristics and structural response under flow-induced vibration are mainly influenced by inertia, damping, ela...Dynamics and vibration of control valves under flow-induced vibration are analyzed. Hydrodynamic load characteristics and structural response under flow-induced vibration are mainly influenced by inertia, damping, elastic, geometric characteristics and hydraulic parameters. The purpose of this work is to investigate the dynamic behavior of control valves in the response to self-excited fluid flow. An analytical and numerical method is developed to simulate the dynamic and vibrational behavior of sliding dam valves, in response to flow excitation. In order to demonstrate the effectiveness of proposed model, the simulation results are validated with experimental ones. Finally, to achieve the optimal valve geometry, numerical results for various shapes of valves are compared. Rounded valve with the least amount of flow turbulence obtains lower fluctuations and vibration amplitude compared with the flat and steep valves. Simulation results demonstrate that with the optimal design requirements of valves, vibration amplitude can be reduced by an average to 30%.展开更多
研究潜艇在斜航工况下的水动力特性对潜艇操纵性的影响至关重要。本文使用雷诺平均RANS(Reynolds Average Navier-Stockes)与分离涡DES(Detached-Eddy Simulation)2种数值方法,对Joubert BB2潜艇在斜航工况下水动力性能及周围流场进行...研究潜艇在斜航工况下的水动力特性对潜艇操纵性的影响至关重要。本文使用雷诺平均RANS(Reynolds Average Navier-Stockes)与分离涡DES(Detached-Eddy Simulation)2种数值方法,对Joubert BB2潜艇在斜航工况下水动力性能及周围流场进行数值模拟。分析不同漂角工况下潜艇所受力、力矩及周围流场,重点关注围壳及尾舵附近流场,探寻漂角变化对潜艇受力及流场的影响。结果显示,采用DES方法计算大漂角工况时误差更小同时流场信息捕捉更加精确。研究结果表明,潜艇大漂角工况下采用DES方法能够更加准确地模拟潜艇受力及流场,同时对研究潜艇斜航状态下的流动分离现象具有一定的参考价值。展开更多
文摘Dynamics and vibration of control valves under flow-induced vibration are analyzed. Hydrodynamic load characteristics and structural response under flow-induced vibration are mainly influenced by inertia, damping, elastic, geometric characteristics and hydraulic parameters. The purpose of this work is to investigate the dynamic behavior of control valves in the response to self-excited fluid flow. An analytical and numerical method is developed to simulate the dynamic and vibrational behavior of sliding dam valves, in response to flow excitation. In order to demonstrate the effectiveness of proposed model, the simulation results are validated with experimental ones. Finally, to achieve the optimal valve geometry, numerical results for various shapes of valves are compared. Rounded valve with the least amount of flow turbulence obtains lower fluctuations and vibration amplitude compared with the flat and steep valves. Simulation results demonstrate that with the optimal design requirements of valves, vibration amplitude can be reduced by an average to 30%.
文摘研究潜艇在斜航工况下的水动力特性对潜艇操纵性的影响至关重要。本文使用雷诺平均RANS(Reynolds Average Navier-Stockes)与分离涡DES(Detached-Eddy Simulation)2种数值方法,对Joubert BB2潜艇在斜航工况下水动力性能及周围流场进行数值模拟。分析不同漂角工况下潜艇所受力、力矩及周围流场,重点关注围壳及尾舵附近流场,探寻漂角变化对潜艇受力及流场的影响。结果显示,采用DES方法计算大漂角工况时误差更小同时流场信息捕捉更加精确。研究结果表明,潜艇大漂角工况下采用DES方法能够更加准确地模拟潜艇受力及流场,同时对研究潜艇斜航状态下的流动分离现象具有一定的参考价值。
