PIV Characterization of High Speed Centrifugal Compressor Impeller-Diffuser Interaction

2007 ◽  
Author(s):  
Kirk Gallier ◽  
Patrick Lawless ◽  
Sandy Fleeter
Keyword(s):  
Centrifugal Compressor ◽  
High Speed ◽  
Compressor Impeller

Numerical Investigation of a High Speed Centrifugal Compressor Impeller

2005 ◽  
Author(s):  
Shun Kang
Keyword(s):  
Secondary Flow ◽  
Flow Structure ◽  
Centrifugal Compressor ◽  
High Speed ◽  
Independent Study ◽  
Low Speed ◽  
Operation Conditions ◽  
Compressor Impeller ◽  
Secondary Flow Structure ◽  
The One

This paper presents the CFD simulations of a high speed centrifugal compressor impeller using the NUMECA Fine/Turbo software with the one equation turbulence model of Spalart-Allmaras. The simulations are validated via comparison with the experimental data. The computational grid densities are changed with the impeller tip size and a grid independent study is carried out. The flow physics of the compressor impeller is numerically studied in details, in particular, the formation of shocks and their effects on the 3D flow and the secondary flow structure are analyzed at different operation conditions, with comparison to low speed machines. It is found that the energy loss production is greatly affected by the shock waves and their interaction with the boundary layers in the inducer portion, while in the other portion, the secondary flow structure is globally the same as those in low speed machines.

A Numerical Study on the Design and Flow Patterns of Compressor Impeller in a Marine Engine Turbocharger

2004 ◽  
Author(s):  
Hong-Won Kim ◽  
Seung-Hyup Ryu ◽  
Sang-Hak Ghal ◽  
Ji-Soo Ha
Keyword(s):  
Centrifugal Compressor ◽  
High Speed ◽  
Numerical Study ◽  
Three Dimensional ◽  
Compressed Air ◽  
Optimized Design ◽  
Vaneless Diffuser ◽  
Marine Engine ◽  
Compressor Impeller ◽  
Impeller Geometry

The centrifugal compressor design of the high-speed marine engine (500–900 kW) turbocharger has been done. Increased Higher compressed air and power density help improvement of the engine performance and power. The centrifugal compressor of the marine engine turbocharger is composed of impeller, 1st vaneless diffuser, vaned diffuser, 2nd vaneless diffuser and volute casing. The design process is achieved by three following stages. First, quasi-two dimensional code is used to determine the main geometry of the compressor. Second, three-dimensional compressible Navier-Stokes equation is applied to analyze the flow pattern and structures of the compressor blade loading. Here, among compressor impeller geometry, blade height variables are mainly changed. Smooth flow guidance has to precede and flow separation symptoms must not appear within compressor impeller. When the loading distribution is inadequate from blade hub to shroud, new curved profile should be designed to minimize the pressure loss. By analyzing the internal flow fields for the compressor impeller geometry variations, three dimensional impeller design profile has been confirmed. Compressed air pressure and mass flow rates from new optimized design were 2.7%, 27.3% higher than that of old one each other. Third, analyzed results are compared with experimental data for the verification of the present design method.

Erosion Behaviors of Impeller Material FV520B in Centrifugal Compressor

2014 ◽  
Vol 894 ◽  
pp. 110-115 ◽  
Author(s):  
Guang Cun Wang ◽  
Jian Feng Li ◽  
Xiu Jie Jia ◽  
Zhao Ju Zhu ◽  
Qi Guo
Keyword(s):  
Centrifugal Compressor ◽  
High Speed ◽  
Erosion Rate ◽  
Impact Angle ◽  
Erosion Model ◽  
Micro Cutting ◽  
Erosion Testing ◽  
Erosion Mechanism ◽  
Compressor Impeller ◽  
The Impact

To study the erosion behaviors and mechanism of impeller material FV520B in centrifugal compressor, the erosion experiments with polygonal alumina particles were carried out on the high-speed erosion testing system. Microstructure of the erosion zone was analyzed by SEM to reveal the erosion mechanism. An erosion model to calculate the erosion rate of FV520B was developed. The results showed that, FV520B exhibited the erosion characteristics of typical plastic materials, the highest erosion rate occurred at the impact angle of 24°, the lowest erosion rate occurred at normal impact angle. The velocity index at the impact angle 24° and 90° were 3.37 and 3.68, it grew as the impact angle increased. The erosion mechanism of FV520B was micro-cutting and deformation wear, at low impact angles, the erosion was dominated by micro-cutting wear, while at high impact angle greater than 60 °, the erosion was dominated by deformation wear. Also the predictions of the erosion model were in good agreement with the results of experiments, indicating that this model can be used to estimate the erosion rate of compressor impeller under different working conditions.

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