Mean Streamline Aerodynamic Performance Analysis of Centrifugal Compressors

1995 ◽  
Vol 117 (3) ◽  
pp. 360-366 ◽  
Author(s):  
R. H. Aungier
Keyword(s):  
Experimental Data ◽  
Performance Analysis ◽  
Centrifugal Compressor ◽  
Performance Prediction ◽  
Validation Studies ◽  
Prediction Models ◽  
Aerodynamic Performance ◽  
Performance Data ◽  
Centrifugal Compressors ◽  
Test Uncertainty

Aerodynamic Performance prediction models for centrifugal compressor impellers are presented. In combination with similar procedures for stationary components, previously published in the open literature, a comprehensive mean streamline performance analysis for centrifugal compressor stages is provided. The accuracy and versatility of the overall analysis is demonstrated for several centrifugal compressor stages of various types, including comparison with intrastage component performance data. Detailed validation of the analysis against experimental data has been accomplished for over a hundred stages, including stage flow coefficients from 0.009 to 0.15 and pressure ratios up to about 3.5. Its application to turbocharger stages includes pressure ratios up to 4.2, but with test uncertainty much greater than for the data used in the detailed validation studies.

Investigation of Off-Design Performance of Vaned Diffusers in Centrifugal Compressors: Part I — A Channel-Wedge Diffuser

2002 ◽  
Author(s):  
JongSik Oh
Keyword(s):  
Experimental Data ◽  
Centrifugal Compressor ◽  
Performance Prediction ◽  
Limited Range ◽  
Design Parameters ◽  
Centrifugal Compressors ◽  
Design Point ◽  
Numerical Investigations ◽  
Design Performance

Experimental and numerical investigations of the off-design performance of a simple channel-wedge diffuser in a small centrifugal compressor are presented. Surge and choke conditions as well as design point are considered using somewhat limited range of experimental data and also supplementary 3D CFD results. Some critical meanline design parameters’ behavior is investigated numerically, to render the basis for improved modelings in the meanline performance prediction.

Aerodynamic Performance Prediction of a Profile in Ground Effect

2014 ◽  
Author(s):  
Carlo Cravero
Keyword(s):  
Experimental Data ◽  
Performance Prediction ◽  
Reference Data ◽  
Ground Effect ◽  
Aerodynamic Performance ◽  
The Other ◽  
Cfd Analysis ◽  
Suction Surface ◽  
Source Codes ◽  
Commercial Code

A very detailed experimental case of a reversed profile in ground effect has been selected in the open literature and the available experimental data have been used as reference data for CFD analysis. The CFD approach has been used to predict the aerodynamic performance of the profile at different heights with respect to the ground: from the freestream case (no ground effect) to a low height where the stall on the suction surface limits the profile operation. Different CFD codes have been used starting with a well-known commercial code to different open source codes. The set of analysis with the commercial code has allowed the setup of the mesh to have the best accuracy from the simulations. The same grids have been used for the other codes in order to directly compare the solver properties without mesh influence. The results obtained by the codes are compared and discussed.

scholarly journals Centrifugal Compressor Testing Experience and Practice

1982 ◽  
Author(s):  
R. H. Meier ◽  
C. S. Rhea
Keyword(s):  
Natural Gas ◽  
Centrifugal Compressor ◽  
Performance Testing ◽  
Field Performance ◽  
Field Testing ◽  
Aerodynamic Performance ◽  
Reasonable Accuracy ◽  
Centrifugal Compressors ◽  
Factory Test ◽  
Different Types

Experience with factory and field performance testing of centrifugal compressors in natural gas service is presented. The ability of different types of factory test arrangements to closely predict future field performance is compared. Instrumentation requirements for achievement of reasonable accuracy in field testing are defined and discussed. Major aspects of mechanical and aerodynamic performance testing are addressed.

scholarly journals Effect of Vaneless Diffuser Shape on Performance of Centrifugal Compressor

2020 ◽  
Vol 10 (6) ◽  
pp. 1936
Author(s):  
Qian Zhang ◽  
Qiuhong Huo ◽  
Lei Zhang ◽  
Lei Song ◽  
Jianmeng Yang
Keyword(s):  
Numerical Simulation ◽  
Energy Loss ◽  
Pressure Distribution ◽  
Centrifugal Compressor ◽  
Aerodynamic Performance ◽  
Operating Conditions ◽  
Vaneless Diffuser ◽  
Centrifugal Compressors ◽  
Parallel Wall

The influence of four different vaneless diffuser shapes on the performance of centrifugal compressors is numerically studied in this paper. One of the studied shapes was a parallel wall diffuser. Two others had the width reduced only from hub and shroud and the rest had the width reduced from hub and shroud divided evenly. Then the numerical simulation was employed and the overall compressor aerodynamic performance was studied. The detailed velocity and pressure distribution and energy loss within the centrifugal compressor with different diffuser geometries and different operating conditions were analyzed. The results revealed that shroud pinch significantly improved the overall compressor aerodynamic performance more than any other pinch types, and the best performance can be achieved by pinched diffusers under the design condition compared with pinched diffusers under the near surge condition or choking condition. The range of energy loss, namely the static entropy area in the compressor, become reduced with the above three pinches diffusers.

Evaluation and Enhancement of a One-Dimensional Performance Analysis Method for Centrifugal Compressors

2014 ◽  
Author(s):  
Enrico Klausner ◽  
Uwe Gampe
Keyword(s):  
Performance Analysis ◽  
Performance Prediction ◽  
Standard Procedure ◽  
Flow Analysis ◽  
Measurement Data ◽  
Theoretical Models ◽  
Analysis Method ◽  
Centrifugal Compressors ◽  
One Dimensional ◽  
The One

The one-dimensional flow analysis along a mean streamline is an appropriate and established procedure for initial design and performance analysis of turbomachinery. One such method for performance analysis of centrifugal compressors was published by Aungier in the 1990s. The latest description of Aungier’s performance prediction model was applied to a set of centrifugal compressor stages published in literature. For each test case the whole performance map was calculated and compared with measurement data. The calculation results correspond well with measured data over a wide operating range. However, near choke or stall the mean streamline performance prediction deviates from measurements. After evaluation of this “standard” mean streamline model specific loss correlations, e.g. for choking, incidence and shock losses were replaced by theoretical models. The aim was to implement a more physical based loss model which is able to predict the performance of compressor stages outside the limits of the standard procedure. The modified procedure was again validated against measurements of the above mentioned compressor stages. The modified procedure gives a better prediction of operating performance and behavior. Shortcomings of the procedure are still the overestimation of vaneless diffuser losses at low mass flow rates and the uncertainty in prediction of choke limit. In conclusion recommendations for advancement of the one-dimensional performance analysis method are given.

Losses in Vaneless Diffusers of Centrifugal Compressors and Pumps: Analysis, Experiment, and Design

1966 ◽  
Vol 88 (1) ◽  
pp. 49-60 ◽  
Author(s):  
J. P. Johnston ◽  
R. C. Dean
Keyword(s):  
Experimental Data ◽  
Centrifugal Compressor ◽  
Friction Loss ◽  
Sudden Expansion ◽  
Centrifugal Compressors ◽  
One Dimensional ◽  
Complex Theory ◽  
Loss Analysis ◽  
Analysis Experiment ◽  
Vaneless Diffusers

Two simple analyses are developed to predict losses in centrifugal compressor (or pump) vaneless diffusers: (a) One-dimensional, axisymmetric friction loss and (b) sudden-expansion mixing to account for losses in the diffuser caused by wakes of separated impeller blades. It is shown that these theories may be substituted for the more complex theory of Dean and Senoo [5]. Some experimental data are included to show the validity of the friction-loss analysis. Finally, the utility of the analyses in design is demonstrated.

Influence of Cavity Flows Modeling on Centrifugal Compressor Stages Performance Prediction Across Different Flow Coefficient Impellers

2014 ◽  
Author(s):  
Emanuele Guidotti ◽  
Lorenzo Toni ◽  
Dante Tommaso Rubino ◽  
Libero Tapinassi ◽  
Giovanni Naldi ◽  
...  
Keyword(s):  
Experimental Data ◽  
Test Data ◽  
Centrifugal Compressor ◽  
Performance Prediction ◽  
Critical Role ◽  
Secondary Flows ◽  
Low Flow ◽  
High Fidelity ◽  
Cavity Flows ◽  
Flow Features

Computational Fluid Dynamics (CFD) is becoming fundamental to predict turbomachinery performance. However, only using advanced numerical models coupled with high fidelity grid generation is possible to reach a very good matching with test data. In this regard, secondary flow modeling plays a critical role in the accuracy of performance prediction for centrifugal compressor stages. This study analyses the effects of cavity models on centrifugal compressor stages performance across the full range of impeller flow coefficients used in common industrial applications. Both bi-dimensional low flow coefficients with splitter and non splitter blades and three-dimensional high flow coefficients stages have been used as test cases to compare the numerical prediction with test data. Furthermore the effects of secondary flows modeling have been assessed when comparing detailed flow features with advanced experimental data both in terms of 1D profiles and 2D maps. The effects of cavity flows modeling is growing, as expected, moving to very low flow coefficients, reaching several points of difference in efficiency calculation with respect to simpler models. Furthermore, the agreement with experimental data is very good both in terms of overall performance and detailed flow features. Finally, the high fidelity CFD is capable to give deep in-sides into the flow evolution inside the machine allowing aero designers to design centrifugal compressor stages with higher performance. It should be remarked here that a good matching of CFD prediction with test data is possible only by using high fidelity models.

Influence of Key Design Parameters on the Aerodynamic Performance of a Centrifugal Compressor Volute for Turbocharger Applications

2020 ◽  
Author(s):  
Pier Francesco Melani ◽  
Francesco Balduzzi ◽  
Alessandro Bianchini ◽  
Giovanni Ferrara ◽  
Pierre-Alain Hoffer ◽  
...  
Keyword(s):  
Centrifugal Compressor ◽  
Performance Prediction ◽  
Total Pressure ◽  
Radial Flow ◽  
Automatic Generation ◽  
Aerodynamic Performance ◽  
Design Parameters ◽  
Critical Feature ◽  
Azimuthal Position ◽  
Internal Fluid

Abstract A centrifugal compressor volute should ideally collect the pressurized flow at the diffuser outlet and convey it to the outlet piping as efficiently as possible. The total pressure loss related to the conversion of a radial flow into an axial one, however, is often not negligible, especially for applications where severe dimensional constraints are given, such as in turbochargers applications. Having a reliable tool for the performance prediction of the volute, flexibly adaptable to external constraints, is then pivotal in the design phase of new prototypes. Within this context, a fully parametric tool has been developed. Based on few geometrical inputs, it allows an automatic generation of both the CAD model of the volute and the numerical setup for the CFD calculation. The shape of the volute cross-section can be fully customized and automatically adapted to the azimuthal distributions of the area and centroid radius given in input by the user. The volute tongue can be also freely modified in terms of shape, azimuthal position and width. An extensive parametric analysis was then carried out, aimed at investigating the influence of key design parameters needed to define the shape of the volute on the internal fluid dynamics. Particular attention was paid to the tongue modelling strategy and shape, being it the critical feature for the volute flow performance. As a result, some annotated indications are given to define the first layout of a volute when approaching a new design.

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