Optimization of Vane Diffuser in a Mixed-Flow Pump for High Efficiency Design

Optimization of Vane Diffuser in a Mixed-Flow Pump 

for High Efficiency Design

Abstract

This paper presents an optimization procedure for high-efficiency design of a mixed-flow pump. Optimization techniques based on a weighted-average surrogate model are used to optimize a vane diffuser of a mixed-flow pump.

Validation of the numerical results is performed through experimental data for head, power and efficiency. Three-level full factorial design is used to generate nine design points within the design space. Three-dimensional Reynoldsaveraged Navier-Stokes equations with the shear stress transport turbulence model are discretized by using finite volume approximation and solved on hexahedral grids to evaluate the efficiency as the objective function. In order to reduce pressure loss in the vane diffuser, two variables defining the straight vane length ratio and the diffusion area ratio are selected as design variables in the present optimization. As the results of the design optimization, the efficiency at the design flow coefficient is improved by 7.05% and the off-design efficiencies are also improved in comparison with the reference design.

Keywords: Mixed-flow pump, Impeller, Vane diffuser, Efficiency, Optimization, Weighted-average surrogate model.

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Optimization of Vane Diffuser in a Mixed-Flow Pump for High Efficiency Design

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Design and CFD Analysis of Centrifugal Pump

Design and CFD Analysis of Centrifugal Pump

Abstract— the purpose of this paper is to identify /observe and determine the pattern of velocity profile and pressure distribution by using CFD simulation program after the 3D design and modeling of the pump is made using Vista CPD. Basically, this paper revolves around the idea of investigating the effect and distribution of velocity profile and pressure within a pump having the following specification, Head = 20 m, Flow rate = 280 m3/hr, and RPM = 1450. 3D Navier–Stokes equations were solved using ANSYS CFX.

The standard k -e turbulence model was chosen for turbulence model. From the simulation results it was observed that the pressure increases gradually from impeller inlet to outlet. The static pressure on pressure side is evidently larger than that on suction side at the same impeller radius. In addition to this, it was observed that, the velocity increases from impeller inlet until it enters the volute casing. It then drops to a minimum value at outlet region.

 

Keywords— Centrifugal pump design, CFD Analysis, Simulation, ANSYS CFX, Vista CPD, pressure distribution, CFD-Tool.

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Design and CFD Analysis of Centrifugal Pump
Size:786 KB

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Inducer Design That Avoids Rotating Cavitation

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Inducer Design That Avoids Rotating Cavitation

Abstract:

Rotating cavitation instabilities in inducers are often encountered in turbopumps of rocket engines even in the normal running conditions.

They impact on bearings radial loads, on pipe pressure oscillations and then decrease the engine reliability. The inducer presented here was designed with the goal to suppress these instabilities.