Numerical simulation on characteristics of emergency shut-down of cylindrical valve for hydraulic turbine 水轮机筒阀动水关闭特性的数值模拟
The adjusting bolt, the valve core sleeve, the valve core, the spring, the steel ball, the copper block, the spring and the adjusting block are respectively arranged in two cylindrical valve bodies; 所述调整螺栓、阀芯套、阀芯、弹簧、钢球、铜块、弹簧和调节块,分别装配在所述两个圆柱形阀体内;
The stress distributions of three shapes, i.e., spherical, rotating paraboloid and cylindrical type heart valve leaflets, are simulated with hyper-elastic finite element. 采用四节点板壳元,对球面、圆柱面、旋转抛物面3种不同型面生物瓣瓣叶的应力分布进行了超弹性有限元数值模拟。
The developed drill pipe valve used in gas drilling is made up of nipple, cushion, sealing parts, valve seat, pin bearing, cylindrical torsion spring and valve plate. 气体钻井过程中,常规的配套工具无法满足工艺要求,为此而研制的气体钻井用钻杆阀由钻杆阀短节、缓冲垫、密封部件、阀座、销轴、圆柱扭簧和阀板等组成。
In the present paper, the optimized design of the cylindrical helix compression spring used in the relief valve of the erect steam boiler is carried out by the dual method of the geometric programming with the positive term formula of constraint. 本文用约束正定式几何规划对偶法,对蒸煮用立式锅炉微启式安全阀上的圆柱形螺旋压缩弹簧进行了优化设计。
However, compared with traditional cylindrical spool valve, most anomalous orifices still face some problems, for instance, existing research data or achievements are less, study on characteristics lack depth or are incomplete. 然而,与传统圆柱形滑阀相比,多数异形阀口滑阀还存在着已有研究资料、成果少,以及特性研究不深入、不完善等问题。