摘要
安全阀是运载火箭增压输送系统所属重要单机,用于保护推进剂贮箱免受过压,在地面测试中曾出现安全阀在启闭过程中主阀颤振现象,导致零件受损并影响产品性能.基于动网格下的N-S流动方程和非线性接触下的刚体运动控制方程的流固耦合方法,采用Realizable k-ε湍流模型和显式动力学算法分析了阀门的气动载荷,进而分析出阀门颤振产生的机理为流场压力脉动与结构频率耦合和活塞在冲击响应作用下与阀杆都产生了塑性变形,据此提出增大运动部件尺寸来改善结构频率的措施,并对改善后的产品开展抽样试验验证,测试结果表明采取的改善措施有效地解决了阀门颤振问题,具有实际的工程价值.
For the rocket pressurization system,safety pneumatic valve is a security device which protects the propellant tank from overpressure.On a ground test,the main valve revealed a phenomenon of flutter as the valve opening or closing,which may induces damage to some parts,what′s worse,threatens the product performance.To find out the cause of valve flutter,based on fluid-structure interaction of N-S dynamic grid flow equation of and nonlinear contact rigid body motion control equation,aerodynamic load is computed by Realizable k-εturbulence model and explicit dynamic algorithm.The mechanism of valve flutter phenomenon is pressure fluctuation coupling with structural frequency and piston rod produces plastic deformation under impact response with position bolt.An improvement measure to improve structural frequency is increasing the size of moving parts.Following with ground test verification,the result shows that the measure being taken can suppress the safety pneumatic valve flutter effectively,which has practical engineering value.
作者
陈其法
朱春艳
王文彬
曹文斌
Chen Qifa;Zhu Chunyan;Wang Wenbin;Cao Wenbin(Aerospace System Engineering Shanghai,Shanghai 201109,China)
出处
《动力学与控制学报》
2019年第6期528-536,共9页
Journal of Dynamics and Control
关键词
安全阀
颤振
流固耦合
气动载荷
试验验证
safety pneumatic valve
flutter
fluid-structure interaction
aerodynamic load
test validation
