scholarly journals SURGE IN A PRESSURE-COMPENSATED POSITIVE DISPLACEMENT VANE-PUMP

1996 ◽  
Vol 1996 (3) ◽  
pp. 85-90
Author(s):  
Hisanori UENO ◽  
Atushi OKAJIMA ◽  
Yoshihiro OJI ◽  
Takanori HONDA
Keyword(s):  
Vane Pump ◽  
Positive Displacement

A Dynamic Analysis on the Transition Curve of Profiled Chamber Metering Pump

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Hua Lei ◽  
Huijün Hu ◽  
Yang Lu
Keyword(s):  
Dynamic Analysis ◽  
Mechanical Vibration ◽  
Transition Curve ◽  
Mechanical Resistance ◽  
Vane Pump ◽  
Pump System ◽  
Positive Displacement ◽  
The Face ◽  
Dynamic Performances ◽  
Loss Control

A profiled chamber metering pump (PCMP) is a new type of positive-displacement vane pump which is composed of a special stator and a rotor–slide assembly. The face-shaped curve of the inner chamber of the stator is formed by means of two quarter circular arcs and two quarter noncircular arcs, and one of the two quarter noncircular arcs is defined as transition curve. The geometry of the transition curve directly affects the dynamic performances of the pump system, including its mechanical vibration, friction, wear, and kinetic losses. This paper discusses a set of dynamic analysis methods that combine kinetic loss control with vibration control for optimization of the transition curve of the PCMP. At first, basic conception and work line on the method are explained. In a second step, by means of force analysis, a kinetic loss model is established. Then, the model is used to examine a group of vibration optimized curves in polynomial form, and kinetic losses caused by different mechanical resistance forces are calculated. Finally, through a comparison analysis together with vibration and kinetic losses, comprehensive optimal transition curves can be obtained.

Vane tip detachment in a positive displacement vane pump

1998 ◽  
Vol 12 (5) ◽  
pp. 881-887 ◽  
Author(s):  
Myung-Rae Cho ◽  
Dong-Chul Han
Keyword(s):  
Vane Pump ◽  
Positive Displacement ◽  
Vane Tip

Analysis of Pump Induced Radiated Noise From Undersea Vehicles

2001 ◽  
Author(s):  
Scott E. Hassan ◽  
Raymond W. Roberts
Keyword(s):  
Element Model ◽  
Vane Pump ◽  
Radiated Noise ◽  
Positive Displacement ◽  
Radiated Power ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Undersea Vehicle ◽  
The Many ◽  
Pump Inlet

Abstract Positive displacement pumps are one of the many potential noise and vibration sources associated with undersea vehicles. This paper presents an approach to predict the tonals radiated from vane-type pumps mounted in undersea vehicles. The approach is based on using a numerical model of a vane pump coupled to an analytical model of the pump inlet hose and a finite element model of the hull and internal structure associated with the fluid-loaded undersea vehicle. An illustrative example is presented that demonstrates the influence of the various propagation paths and pump parameters on the overall radiated power. The basic approach can be readily extended and implemented as part of a simulation based design process for managing vehicle acoustics and vibration.

The Vane Bearing—A Self-Pressurizing Journal Bearing

1975 ◽  
Vol 189 (1) ◽  
pp. 99-106 ◽  
Author(s):  
C. Ettles
Keyword(s):  
Theoretical Analysis ◽  
Journal Bearing ◽  
Load Capacity ◽  
Vane Pump ◽  
Power Requirement ◽  
Displacement Effect ◽  
Oil Film ◽  
Hydrostatic Bearing ◽  
Positive Displacement ◽  
Exit Port

If the shaft of a journal bearing could be made to have a number of pressure sources which travel with the shaft, the load capacity of the oil film could be greatly enhanced. This paper describes the development of a concept in which the pressure sources arise from a positive displacement effect due to the eccentricity of the shaft within the bearing. The configuration has similarities to the rotor of a vane pump in which the entry port is open and the exit port closed. The bearing could be described as a hybrid hydrodynamic-hydrostatic bearing where the hydrostatic supply is self-contained and self-generated. A number of methods of causing this self-pressurization are discussed. A theoretical analysis shows that load (or Sommerfeld) number improvement factors in the range 3–10 are quite feasible at the expense of an increased flow and power requirement.

scholarly journals Simulation of the Filling Capability in Vane Pumps

Energies ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 283 ◽  
Author(s):  
Massimo Rundo ◽  
Giorgio Altare ◽  
Paolo Casoli
Keyword(s):  
High Speed ◽  
Maximum Flow ◽  
Vane Pump ◽  
Cfd Simulations ◽  
Flow Area ◽  
Positive Displacement ◽  
Incomplete Filling ◽  
Computational Fluid Dynamics Cfd ◽  
Suction Flow ◽  
Dissolved Air

In positive displacement pumps, the main volumetric loss at high speed is due to the incomplete filling of the variable volume chambers. The prediction of the limit speed and of the maximum flow rate delivered by a pump can be obtained only through Computational Fluid Dynamics (CFD) simulations, since the shape, the orientation, and the movement of the chambers with respect to the inlet volume must be considered, along with the non-uniform distribution of the gaseous phase, due to the dissolved air release. In this paper, the influence of different geometric parameters on the filling of a vane pump has been investigated through the commercial software PumpLinx®. At first, a model of a reference pump has been created and validated with different configurations of the suction flow area, then a simplified model has been used for assessing the influence of the geometry of the rotating assembly. It was found that a pump with a low ratio between the axial thickness and the diameter has a higher volumetric efficiency if the chambers are fed from one side only. Opposite behaviors were found in the case of pumps with small diameters and high thicknesses. Moreover, the filling could be improved by increasing the number of chambers, and by reducing the diameter of the rotor, even only locally.

scholarly journals Lumped parameter model of vane pumps developed in OpenModelica environment

2021 ◽  
Vol 312 ◽  
pp. 05005
Author(s):  
Barbara Zardin ◽  
Giovanni Cillo ◽  
Marco Rizzoli ◽  
Massimo Borghi
Keyword(s):  
Flow Rate ◽  
Dynamic Behaviour ◽  
Fluid Dynamic ◽  
Dynamic Modelling ◽  
Physical Modelling ◽  
Lumped Parameter Model ◽  
Fluid Power ◽  
Vane Pump ◽  
Positive Displacement ◽  
Lumped Parameter

In this paper, the authors present a 0D fluid dynamic model of a vane pump used to refill tanks with fuel. The model is entirely developed in OpenModelica environment, where the authors have created specific libraries of elements suitable for the physical modelling of fluid power components and systems. Among the different approaches, the zero-dimension (0D) fluid-dynamic modelling of positive displacement machines is suitable to study many aspects as: the instantaneous flow rate, pressure and torque transients, the fluid borne noise related to the flow rate and pressure irregularity, the dynamic behaviour of the variable displacement control. Overall, this approach in modelling allows to link the geometrical features of the machine with its dynamic behaviour and for this reason is particularly useful in guiding the design. The model of the vane pump is described together with the main design features that can be analysed in terms of their influence on the pump behaviour. Besides the specific results obtained regarding the design of the pump, the paper also demonstrates the use of OpenModelica language and environment, and its efficacy, into the applications of fluid power modelling and simulation.

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