Performance evaluation and cfd analysis of a positive displacement diaphragm pump

Download

index.pdf

Date

2011

Author

Gökçe, Gökay

Metadata

Show full item record

Item Usage Stats

326
views

587
downloads

In order to understand flow characteristics inside a positive displacement pump, every point in the flow field must be carefully observed. Such observations are difficult, expensive and usually time consuming to achieve with physical testing. During tests one can observe flow characteristics only at the locations where the instrument device is attached, not the whole flow domain. This thesis mainly focuses on the evaluation of design and performance characteristics of a positive displacement triplex diaphragm pump. For this purpose not only numerical investigations but also experimental studies were conducted using a positive displacement pump which is supplied by the pump manufacturer and is available in the fluid mechanics laboratory of Middle East Technical University. The effect of valve characteristics on the pump efficiency such as valve spring stiffness, valve displacement, mass of the check valves, and diaphragm shape are investigated in this thesis by using CFD (Computational Fluid Dynamics) technique. The pump performance is analyzed in terms of its volumetric and hydraulic efficiencies. The effect of the valve closure delay is also discussed. After the CFD and experimental results of the current pump model are compared and it is seen that they are in close agreement with each other, parametric studies are performed in computer environment. From analysis results it is observed that using stiffer springs reduces valve closing time and tend to decrease flow reversal effects. Secondly, using heavier check valves increases valve closing and opening times and also increases the stresses on the components of the pump with the increased pressure drop through discharge valve. As a result of this condition, hydraulic and volumetric efficiency reduce. Thirdly, with the longer valve displacement arrangement, more time is required for opening and closing of the check valves therefore efficiency of the pump reduces.

Subject Keywords

Pumping machinery

URI

http://etd.lib.metu.edu.tr/upload/12613799/index.pdf
https://hdl.handle.net/11511/20858

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

NUMERICAL STABILITY OF RBF APPROXIMATION FOR UNSTEADY MHD FLOW EQUATIONS Gurbuz, Merve; Tezer, Münevver (2019-01-01) In this study, the radial basis function (RBF) approximation is applied for solving the unsteady fluid flow and magnetohydrodynamic (MHD) convection flow problems with the use of explicit Euler time discretization and relaxation parameters to accelerate the convergence. The stability analysis is also carried out in terms of the spectral radius of related RBF discretized coefficient matrices. The optimal choices of the time increment, relaxation parameters and physical problem parameters are found for achiev...
Inertial parameter design of spatial mechanisms Can, Fatih Cemal; Soylu, Reşit; Department of Mechanical Engineering (2003) In this thesis, the inertial parameters of a spatial mechanism are used in order to optimize various aspects of the dynamic behaviour of the mechanism (such as minimizing actuator torque/ force fluctuations, shaking force/moment balancing, etc.) while the effects of loads are considered as well. Here, inertial parameters refer to the mass, 6 elements of the inertia tensor and coordinates of the center of mass of the links. The concept of Force Fluctuation Number (FFN) is utilized to optimize the dynamic beh...
Modeling and performance improvements of a pressure compensated axial piston pump Aydoğan, Okan; Balkan, Raif Tuna; Department of Mechanical Engineering (2018) Analysis of internal dynamics of a pressure compensated axial piston pump has an importance to predict the pump characteristics. In order to accomplish this mission physical model is developed to simulate pump pressure-flow characteristics for a given set of system parameters in Matlab/Simulink environment. The pump is modeled as two main groups, namely, pumping section, and compensation section. Pistons are orderly nested in cylinder block around shaft axis in the pump. In the pumping section model, multi-...
Incompressible flow simulations using least squares spectral element method on adaptively refined triangular grids Akdağ, Osman; Sert, Cüneyt; Department of Mechanical Engineering (2012) The main purpose of this study is to develop a flow solver that employs triangular grids to solve two-dimensional, viscous, laminar, steady, incompressible flows. The flow solver is based on Least Squares Spectral Element Method (LSSEM). It has p-type adaptive mesh refinement/coarsening capability and supports p-type nonconforming element interfaces. To validate the developed flow solver several benchmark problems are studied and successful results are obtained. The performances of two different triangular ...
Design considerations and performance evaluation of a surge tank for diaphragm pump operation Özdemir, Şahika; Albayrak, Kahraman; Kayılı, Serkan; Department of Mechanical Engineering (2010) This thesis is performed to evaluate the design consideration and performance characteristics of a surge tank for a diaphragm pump operation and to evaluate the proper volume and inlet area of surge tank in order to reduce the pulsations of the discharge pressure. An experimental set up is constructed for a three diaphragm positive displacement pump and the experiments are conducted afterwards. The surge tanks having different volumes and the surge tank inlet area configurations are tested in order to achie...

Citation Formats

G. Gökçe, “Performance evaluation and cfd analysis of a positive displacement diaphragm pump,” M.S. - Master of Science, Middle East Technical University, 2011.