Influence of Swirl Distribution on Blade Shape and Performance of a Centrifugal Impeller

2021 ◽  
Author(s):  
Qin Cui ◽  
Guoliang Qin ◽  
Lei Li ◽  
Cheng Jia ◽  
Yi Wang
Keyword(s):  
Centrifugal Impeller ◽  
Blade Shape ◽  
And Performance

Influence of Swirl Distribution on Blade Shape and Performance of a Centrifugal Impeller

2020 ◽  
Author(s):  
Qin Cui ◽  
Guoliang Qin ◽  
Lei Li ◽  
Cheng Jia ◽  
Yi Wang
Keyword(s):  
Flow Field ◽  
Centrifugal Compressor ◽  
Flow Direction ◽  
Input Parameter ◽  
Vortex Method ◽  
Centrifugal Impeller ◽  
Streamline Curvature ◽  
Design Program ◽  
Blade Shape ◽  
And Performance

Abstract All-over-controlled vortex method is an effective tool to inversely design the 3D impeller of a centrifugal compressor. In this method, swirl distribution is treated as a significant input parameter to control the blade shape, impeller flow field, and compressor performance. It is acknowledged that swirl distribution is prescribed by designers mostly relying on the personal experience at the beginning of design. So how to specify the swirl distribution is still a big challenge for impeller designers. Of the most interest in this paper is to provide a theoretical technique that can be readily applied to specify swirl distribution and reduce the dependence on the designers experience. A judgement criterion rCθ – ωr2 is proposed to design the swirl distribution. Based on the streamline curvature method, a 3D centrifugal impeller design program is developed to design centrifugal impeller. The scale and uniformity of rCθ – ωr2 along flow direction are discussed theoretically to conduct the specifying of swirl distribution. The theoretical analysis is verified by a specific centrifugal compressor case. Then commercial CFD software is used to predict the flow field and the performance of the impeller. The results demonstrate that the scale and distribution uniformity of rCθ – ωr2 have a significant effect on the blade shape and the flow field within the impeller, and possible loss can be reduced. For the new designer, it is possible to preliminarily recognize and eliminate the infeasible swirl distribution, and adjust the unsatisfactory swirl distribution using rCθ – ωr2. Proper blade shape and good impeller performance can be achieved with the help of the judgement criterion rCθ – ωr2.

A Study on the Blade Shape Influence on Flow Distribution and Performance in Centrifugal Compressor Rotors

1990 ◽  
Author(s):  
Raffaele Tuccillo ◽  
Adolfo Senatore
Keyword(s):  
Flow Pattern ◽  
Boundary Layers ◽  
Centrifugal Compressor ◽  
Flow Distribution ◽  
Aircraft Engine ◽  
Pressure Losses ◽  
Compressor Rotor ◽  
Blade Shape ◽  
Shape Influence ◽  
And Performance

The authors present an analysis of the flow through a centrifugal compressor rotor. A quasi-3D flow model evaluates the interaction of the meridional and blade-to-blade solution, so as to determine the flow pattern inside an inviscid region. A further interaction is then considered between the non-viscous flow and the boundary layers which grow along the end-walls and the blade surfaces. This makes it possible both to determine a more realistic flow condition, because of the blockage effects exerted by the boundary layers, and to estimate the total pressure losses related to the momentum thickness. Examples are presented for a compressor of an aircraft engine. The influence of blade shape on the above described phenomena is analyzed, starting from the actual rotor geometry and making a parametric study of the alterations in flow pattern produced by changes in meridional blade shape, inlet and outlet flow areas, and splitter blades. The analysis will provide a basis for future activities involving the use of optimizing techniques for the final choice of the blade characteristics.

Application of a Three-Dimensional Inverse Method to the Design of a Centrifugal Compressor Impeller

1998 ◽  
Author(s):  
Alain Demeulenaere ◽  
Olivier Léonard ◽  
René Van den Braembussche
Keyword(s):  
Centrifugal Compressor ◽  
Inverse Method ◽  
Three Dimensional ◽  
Navier Stokes ◽  
Centrifugal Impeller ◽  
Mean Velocity ◽  
Blade Shape ◽  
Compressor Impeller ◽  
Real Performance ◽  
The Mean

The use of a three-dimensional Euler inverse method for the design of a centrifugal impeller is demonstrated. Both the blade shape and the endwalls are iteratively designed. The meridional contour is modified in order to control the mean velocity level in the blade channel, while the blade shape is designed to achieve a prescribed loading distribution between the inlet and the outlet. The method salves the time dependent Euler equations in a numerical domain of which some boundaries (the blades or the endwalls) move and change shape during the transient part of the computation, until a prescribed pressure distribution is achieved on the blade surfaces. The method is applied to the design of a centrifugal compressor impeller, whose hub endwall and blade surfaces are modified by the inviscid inverse method. The real performance of both initial and modified geometries are compared through three-dimensional Navier-Stokes computations.

Aerodesign and Performance Analysis of a Radial Transonic Impeller for a 9:1 Pressure Ratio Compressor

1992 ◽  
Author(s):  
S. Colantuoni ◽  
A. Colella
Keyword(s):  
Pressure Ratio ◽  
Minimum Cost ◽  
Finite Volume Discretization ◽  
Blade Shape ◽  
Cost Development ◽  
Air Intake ◽  
Time Marching ◽  
Overall Performance ◽  
And Performance ◽  
Euler Solver

The aerodynamic design of a centrifugal compressor for technologically advanced small aeroengines requires more and more the use of sophisticated computational tools in order to meet the goals successfully at minimum cost development. The objective of the present work is the description of the procedure adopted to design a transonic impeller having 1.31 relative Mach number at the inducer tip, 45° back-swept exit blade angle, and a tip speed of 636 m/s. The optimization of the blade shape has been done analyzing the aerodynamic flowfield by extensive use of a quasi-3d code and a fully 3D Euler solver based on a time-marching approach and a finite volume discretization. Testing has been done on the impeller-only configuration, using a compressor rig that simulates a real engine hardware, i.e. having an S-shape air-intake. The overall performance of the impeller are presented and discussed.

scholarly journals A theoretical derivation of the Cordier diagram for turbomachines

2010 ◽  
Vol 225 (2) ◽  
pp. 354-368 ◽  
Author(s):  
Ph Epple ◽  
F Durst ◽  
A Delgado
Keyword(s):  
Total Pressure ◽  
High Efficiency ◽  
Performance Parameters ◽  
Theoretical Derivation ◽  
Design Rules ◽  
Rotating Speed ◽  
Optimum Diameter ◽  
Blade Width ◽  
Blade Shape ◽  
And Performance

The design of high-efficiency fans is often based on the experience of the designer. In order to determine its main dimensions, fan designers use the Cordier diagram. For a given operating point (i.e. flowrate and pressure, and a rotating speed), the optimum diameter of high-efficiency fans can be found in the Cordier diagram. The Cordier diagram is an empirical diagram based on measurements. It delivers a relation between flowrate, pressure, rotating speed, and diameter. However, the Cordier diagram does not provide any information on the blade shape (i.e. the angles and the blade width). In order to fill this gap, there are design rules based on the experience of the designer and some analytical performance parameters in the literature. One very common performance parameter is the reaction, which is the ratio between the static and the total pressure rising from the impeller inlet to its outlet. These design rules and performance parameters are, however, of limited use. Therefore, the total-to-static ideal efficiency is introduced to yield, together with the speed and diameter numbers σ and δ, the essential parameters that distinguish the different turbomachines in the Cordier diagram. Based on the integral parameters of the flow and the geometry of turbomachines, a performance analysis of turbomachines is performed and the Cordier diagram is theoretically derived.

Preliminary Study of a Centrifugal Compressor With Counter-Rotating Impellers: Design and Performances Study

2020 ◽  
Author(s):  
Abed Cheikh Brahim ◽  
Khelladi Sofiane ◽  
Deligant Michael ◽  
El Marjani Abdel ◽  
Farid Bakir
Keyword(s):  
Centrifugal Compressor ◽  
Degrees Of Freedom ◽  
Numerical Data ◽  
Centrifugal Impeller ◽  
Through Flow ◽  
Aerodynamic Performances ◽  
Preliminary Study ◽  
And Performance ◽  
And Control ◽  
Selection Of

Abstract Turbomachinery with double counter-rotating impellers offer more degrees of freedom in the choice of design and control parameters compared to conventional machines. For these innovative machines, the literature review shows that more published works are available concerning axial type turbomachines than centrifugal ones. This work deals with a preliminary design and performance analysis applied to two counter-rotating impellers of a centrifugal compressor. We present here the design practice developed based on 0D/1D models, also coupled with optimization and stream-curvature through-flow methods to satisfy the selected design-criteria. An analyze of aerodynamic performances results are made and compared to those available experimental and numerical data of a baseline configuration, composed of one centrifugal-impeller and a volute. The compressor studied here includes a first conventional impeller with an axial inlet and a mixed or centrifugal outlet. The second impeller is designed parametrically and can be considered as a rotating-diffuser with a radial or mixed inlet and outlet. Ultimately, the numerical simulation results of a selection of candidate solutions are discussed.

Rotordynamic Force Prediction of Whirling Centrifugal Impeller Shroud Passages Using Computational Fluid Dynamic Techniques

1999 ◽  
Author(s):  
J. Jeffrey Moore ◽  
Alan B. Palazzolo
Keyword(s):  
Fluid Dynamic ◽  
Three Dimensional ◽  
Centrifugal Impeller ◽  
Pump Impeller ◽  
Dynamic Techniques ◽  
Computational Fluid Dynamics Cfd ◽  
Steady Solutions ◽  
And Performance ◽  
Rotordynamic Forces ◽  
Frequency Ratios

The demand for higher efficiencies and performance of modern centrifugal turbomachinery requires improved knowledge of critical design factors in strength of materials, aerodynamics, and rotordynamics. While tremendous strides in finite element stress analysis and computational fluid dynamics (CFD) have addressed the first two areas, the lack of accurate prediction tools for centrifugal impellers typically leaves rotordynamics out of the design loop. While several authors have analyzed the rotordynamic forces arising from shrouded centrifugal impellers, there has been no study to couple the secondary shroud passage with the three-dimensional primary flow model. The strong interaction between these domains makes this approach advantageous. The current study utilizes CFD techniques to analyze the full 3D viscous, primary/secondary flow field in a centrifugal pump impeller to determine rotordynamic forces. Multiple quasi-steady solutions of an eccentric, 3D model at different precessional frequency ratios yield the rotordynamic impedance forces. Performing a second order, least-squares analysis generates the skew-symmetric stiffness, damping, and mass matrices. The results show good correlation with experiment for both performance and rotordynamic forces.

Design and Performance Prediction of Centrifugal Impellers

1996 ◽  
Vol 210 (6) ◽  
pp. 463-476 ◽  
Author(s):  
Y Wang ◽  
S Komori ◽  
Z Xu
Keyword(s):  
Boundary Layer ◽  
Performance Prediction ◽  
Three Dimensional ◽  
Axial Direction ◽  
Centrifugal Impeller ◽  
Angle Distribution ◽  
Simple Method ◽  
Viscous Loss ◽  
Compressor Impeller ◽  
And Performance

This study presents a simple method for designing the blade geometry of a centrifugal compressor impeller. In this method, instead of giving the mean swirl distribution on the meridional surface, the blade angle distribution is specified and the blade shape is derived, making it easier to perform the design. The quasi-three-dimensional potential flow field inside the impeller is obtained using the streamline curvature method, which solves the Euler equation along arbitrary quasi-orthogonals. The viscous effect is incorporated indirectly into the inverse design of the impeller via the simplified three-dimensional boundary layer calculation and the performance prediction. A three-dimensional centrifugal impeller was designed using this inviscid-viscous method and eventually manufactured. The newly designed impeller (B) and another impeller (A) designed previously were tested on a standard apparatus for model impellers. With the aid of three-hole probes and thermocouples, the flow parameters downstream of the exit of the impellers were measured along the axial direction of the impellers. A viscous loss model related to the boundary parameters is developed and used for the performance predictions of the impellers together with other loss models. From both the boundary layer analysis and the performance prediction, it is concluded that impeller B is superior to impeller A, which is in close accordance with the measurements.

scholarly journals Modeling And Performance Analysis of A Centrifugal Impeller of Water Pump

2020 ◽  
pp. 118-122
Keyword(s):  
Cast Iron ◽  
Pump Power ◽  
Centrifugal Impeller ◽  
Water Pump ◽  
Centrifugal Pumps ◽  
Ansys Software ◽  
Solid Works ◽  
Polyphenylene Sulphide ◽  
And Performance ◽  
Flow Deflection

An impeller is a rotating component equipped with vanes or blades used in centrifugal pumps. Flow deflection at the impeller vanes allows mechanical power (energy at the vanes) to be converted into pump power output. Impeller of a centrifugal pump, usually made of iron, steel, bronze, brass, aluminum or plastic, which transfers energy from the motor that drives the pump to the fluid being pumped by accelerating the fluid outwards from the center of rotation. A significant improvement is required for impeller design to resist corrosion, Erosion & weight less. The present work is to design, performance of centrifugal impeller made of Poly-phenylene Sulphide (PPS) and Cast Iron materials and compared the results. Centrifugal impeller is modeled in Solid works, and that model is imported in Ansys-Software, using Ansys-Software we investigated Static and Dynamic behavior of impeller and found that the impeller with Polyphenylene Sulphide (PPS) material is best compared to Cast Iron.

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