Author : Frank Horvat
Publisher :
ISBN 13 :
Total Pages : 243 pages
Book Rating : 4.:/5 (883 download)
Book Synopsis A Numerical and Experimental Investigation for the Modification and Design of a Gerolor Using Low Viscosity Fluids by : Frank Horvat
Download or read book A Numerical and Experimental Investigation for the Modification and Design of a Gerolor Using Low Viscosity Fluids written by Frank Horvat and published by . This book was released on 2012 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Gerolor or Gerotor is a positive displacement device which typically functions as either a pump or a motor. This variation in energy input depends on whether the working fluid is driving or being driven by a set of meshing internal gears connected to an input/output shaft. This work proposes a method for the design and performance analysis of a Gerolor pump using low variable viscosity (2-8 cP) oil. The design methodology will detail the modification and redesign of internal rotor/stator components for a commercially available Gerolor. These proposed modifications are limited to (i) rotor profile design and (ii) enhancement of the fluid film layer for seven circumferentially spaced rollers. The two operational parameters used for the experimental work are (i) oil viscosity and (ii) pump flow rate. The experimental work utilizes a test loop specifically designed for the use of multiple original and modified Gerolor test heads. This test loop will function as a means to compare any of the proposed modifications and allow insight into the internal components functionality. One of the studied test heads was remanufactured out of acrylic and used for qualitative purposes to determine component function and to visualize flow paths internally and identify leakage sources and paths. A transient analysis was performed numerically using a commercially available computational fluid dynamics (CFD) package ANSYS CFX, which couples both a fluid solid interaction (FSI) with the full three-dimensional Navier-Stokes equations for an incompressible and constant property, Newtonian fluid. The purpose of this numerical simulation is to model and validate the leakage paths identified experimentally and to model the transient orbit of the inner rotor with respect to the stationary stator. The geometry for this simulation will use one of the experimental pumps where the internal rotor profiles will be created using an in-house developed GerolorGeometryGen (G3) code. The numeric results to be presented will contain both transient velocity and pressure development within the Gerolor.
