Numerical Calculation for Flow Field of Servo-Tube Guided Hydraulic Control Rod Driving System
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摘要: 将伺服管调控原理应用于控制棒驱动机构的设计,提出一种新型的控制棒水力驱动机构。应用流体力学计算软件Fluent对水力驱动缸的内部流场进行数值模拟的结果表明:伺服管外径越大,可变节流口的阻力系数越小;设计中可变节流口的零位间隙可确定为0.2 mm;活塞上下面的压差主要通过固定节流孔的节流作用产生,通过改变可变节流口的间隙可有效控制压差力;驱动缸的提升能力可以满足设计载荷的要求。Abstract: A new-style hydraulic control rod driving mechanism was put forward by using servo-tube control elements for the design of control rod driving mechanism.The results of numerical simulation by CFD program Fluent for flow field of hydraulic driving cylinder indicate that the bigger the outer diameter of servo-tube,the smaller the resistance coefficient of variable throttle orifice.The zero position gap of variable throttle orifice could be determined on 0.2 mm in the design.The pressure difference between the upper and nether surfaces of piston was mainly created by the throttle function of fixed throttle orifice.It can be effectively controlled by changing the gap of variable throttle orifice.And the lift force of driving cylinder is able to meet the requirement on the design load.
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