Fluid–structure coupling modelling and parameter optimization of a direct-acting relief valve for underwater application

2021 ◽  
Author(s):  
Maolin Liao ◽  
Yang Zheng ◽  
Zhiying Gao ◽  
Wen Song
Keyword(s):  
Parameter Optimization ◽  
Relief Valve ◽  
Fluid Structure ◽  
Direct Acting ◽  
Underwater Application

scholarly journals Mathematical Modelling and Dynamic Analysis of a Direct-Acting Relief Valve Based on Fluid-Structure Coupling Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wen Song ◽  
Chenshi Yang ◽  
Xiaoyi Zhang ◽  
Yongdong Li
Keyword(s):  
Water Depth ◽  
Vertical Direction ◽  
Relief Valve ◽  
Fluid Structure ◽  
Wake Oscillator ◽  
Contact Nonlinearity ◽  
Simulation Based ◽  
Coupling Dynamic ◽  
Pump Inlet ◽  
Direct Acting

To explain the sudden jump of pressure as the variation of water depth for a direct-acting relief valve used by torpedo pump as the variation of water depth, a 2-DOF fluid-structure coupling dynamic model is developed. A nonlinear differential pressure model at valve port is applied to model the axial vibration of fluid, and a nonlinear wake oscillator model is used to excite the valve element in the vertical direction; meanwhile, the contact nonlinearity between the valve element and valve seat is also taken into consideration. Based on the developed dynamical model, the water depths for the sudden jumps of pressure can be located precisely when compared with the experimental signals, and the corresponding vibration conditions of the valve element in both the axial and vertical directions are explored. Subsequently, in order to eliminate the sudden jumps of pressure, different pump inlet pressure was tested experimentally; when it was decreased to 0.4 MPa, the pressure jumps ever appeared during the dropping and lifting processes were removed, and the numerical simulation based on the developed mathematical model also verified the experimental measurements.

A Hybrid Model to Analyze the Fluid-Structure Interaction Phenomenon of a Relief System and Experimental Validation

2019 ◽  
Author(s):  
Feng Jie Zheng ◽  
Fu Zheng Qu ◽  
Xue Guan Song
Keyword(s):  
Hybrid Model ◽  
Pressure Fluctuation ◽  
Fluid Structure Interaction ◽  
Relief Valve ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Model Combining ◽  
Valve Motion ◽  
Practical Engineering ◽  
Cfd Method

Abstract As one essential component of a pressurized system, a relief valve is used to guarantee the pressure within a prescribed range. But in practical engineering, pressure fluctuation caused by the operation of a relief valve will travel along the pipeline and couple with the motion of the valve, which might result in malfunction of the valve and the system. In order to investigate the fluid-structure interaction (FSI) phenomenon, a hybrid model combining the method of characteristics (MOC) and computational fluid dynamics (CFD) method is proposed. In the hybrid FSI model, the characteristics of pressure resource is modeled using the performance curves, the compressible gas transmitting in the pipe is calculated by one-dimensional MOC, and the air flow in the valve as well as the valve motion is simulated by a two-dimensional CFD model. To validate the hybrid model, 1:1 scaled test rig is conducted. The compared results show that the hybrid model not only can accurately capture the pressure fluctuation in straight pipeline induced by the closure of the valve but also can accurately predict the forms of the valve motion.

Functional Diagram for Modeling the Electromagnetic Ball Valve with Cylindrical Seat

2014 ◽  
Vol 657 ◽  
pp. 624-628 ◽  
Author(s):  
Dănuţ Zahariea
Keyword(s):  
Volumetric Flow Rate ◽  
Ball Valve ◽  
Functional Diagram ◽  
Pressure Relief Valve ◽  
Hydraulic Pump ◽  
Relief Valve ◽  
Pressure Relief ◽  
Measuring Devices ◽  
Direct Acting ◽  
Valve Pressure

The main objective of this work is to perform numerical analysis of an electromagnetic normally-closed direct-acting ball valve with cylindrical seat. A functional diagram is developed using the MATLAB/Simscape/SimHydraulics programming language. The principal elements of the functional diagram are: the fixed-displacement hydraulic pump, the ball valve which is driven by an electromagnetic actuator, the pressure-relief valve, pressure and volumetric flow rate measuring devices and the hydraulic pipes. Two sets of analyses are performed, the first one for an ideal case, without the effects that are associated with the hydraulic pipes and the second one for the real case, with these effects. The valve flow factor is presented, comparatively, for both cases, as well as the volumetric flow rates through the ball valve and the pressure relief valve, and finally the pressure drop in the valve.

scholarly journals Quality Improvement of a Safety Valve with the Use of Numerical and Experimental Studies

2019 ◽  
Vol 1 (1) ◽  
pp. 378-385
Author(s):  
Grzegorz Filo ◽  
Mariusz Domagała ◽  
Paweł Lempa ◽  
Joanna Fabiś-Domagała ◽  
Dominik Kwiatkowski ◽  
...  
Keyword(s):  
Test Bench ◽  
Safety Valve ◽  
Experimental Studies ◽  
Control Valve ◽  
Hydraulic Cylinder ◽  
Relief Valve ◽  
Excessive Pressure ◽  
Series Of Experiments ◽  
Direct Acting ◽  
Modelling Simulation

Abstract This article presents results of numerical modelling, simulation and test bench experiments of a hydraulic direct-acting relief valve was used as a safety valve. The analyzed safety valve was placed in a system consisting of a fixed-speed pump, a control valve, a hydraulic cylinder as an actuator and a second pressure valve in the load line used as a payload generator for the cylinder. In the first step mathematical model of the system was formulated in the form of a system of ordinary differential equations. Next, simulation model was created in Matlab/Simulink. Simulations were carried out for different values of the actuator payload. The obtained results include time series of pressure, flow rate and displacement of the actuator piston. In order to confirm simulation results, a test bench was built and series of experiments were carried out. High compliance of simulation and laboratory results was obtained. It was confirmed that the proposed solution with the relief valve used as a safety valve fulfills its task of protecting the hydraulic system from excessive pressure increase.

scholarly journals Study on hydraulic direct-acting relief valve

2017 ◽  
Vol 858 ◽  
pp. 012035 ◽  
Author(s):  
V V Syrkin ◽  
P D Balakin ◽  
V A Treyer
Keyword(s):  
Relief Valve ◽  
Direct Acting
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