Numerical and experimental study on novel hydraulic pump concept

Abstract

This paper discusses an investigation on a novel hydraulic pump concept.The idea aims on a pump principle to be directly connected to high-speed electric motors to build compact high-pressure drives.The pump can theoretically work without solid contact and has no kinematic pulsation.The composition of the pump is basically similar to cylindrical journal bearings.In general, a journal bearing is used to support external loads on a rotating shaft.When the shaft rotates with the loads, hydrodynamic fluid force is generated in the fluid film, which compensates the external force and reduces an eccentricity of the shaft.The difference of the introduced pump concept from the bearing is that the eccentricity is fixed and it has an outlet port at the high pressure area, through which the fluid can be transferred.To examine the functionality of the pump, a test bench is constructed and experiments are performed to investigate the pressure build-up and discharging flow of the pump concept.The experimental results are numerically analyzed by using elasto-hydrodynamic lubrication (EHL) simulation, based on the 2D Reynold's equation.From these results, the functionality of the pump concept is confirmed.Moreover, several variables that influence the characteristic curve of the pump are studied.Based on these results, geometric parameters of the test pump are redesigned to discharge sufficient flow rate for usage as commercial pumps.

Authors 4

1. Seong-Ryeol Lee Aachen Institut for Fluid Power Drives and Systems

   RWTH Aachen University

   Affiliation as printed

   Institut for Fluid Power Drives and Systems, RWTH Aachen University

   Institut for Fluid Power Drives and Systems, RWTH Aachen University, Campus-Boulevard 30, 52074 Aachen

2. Florian Schoemacker Aachen Institut for Fluid Power Drives and Systems

   RWTH Aachen University

   Affiliation as printed

   Institut for Fluid Power Drives and Systems, RWTH Aachen University

   Institut for Fluid Power Drives and Systems, RWTH Aachen University, Campus-Boulevard 30, 52074 Aachen

3. Christian Stammen Aachen Institut for Fluid Power Drives and Systems

   RWTH Aachen University

   Affiliation as printed

   Institut for Fluid Power Drives and Systems, RWTH Aachen University

   Institut for Fluid Power Drives and Systems, RWTH Aachen University, Campus-Boulevard 30, 52074 Aachen

4. Katharina Schmitz Aachen Institut for Fluid Power Drives and Systems

   RWTH Aachen University

   Affiliation as printed

   Institut for Fluid Power Drives and Systems, RWTH Aachen University

   Institut for Fluid Power Drives and Systems, RWTH Aachen University, Campus-Boulevard 30, 52074 Aachen