A New Streamline Curvature Throughflow Method for Radial Turbomachinery

Casey, Michael; Robinson, Chris

doi:10.1115/1.3151601

Cited by 39 publications

(22 citation statements)

References 19 publications

(14 reference statements)

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“…It can be shown from the equation of efficiency, Eq. (5), that the entropy production for stages with Mach number less than 0.75 is only a function of flow coefficient. Thus, one may conclude that the collapse of the blockage curves as shown in the present work is a generic result.…”

Section: Figure 7: Stage 5 Blockage Curves At Various Corrected Speedsmentioning

confidence: 99%

“…During preliminary design, the performance curves are generally estimated from empirical 5 This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.…”

Section: Constructing Stage Performance Curvesmentioning

confidence: 99%

“…In a preliminary aerodynamic design system, empirically based methods, referred to as mean-line or throughflow models, are used by engine manufacturers to establish an initial geometry for a new compressor [3][4][5]. These techniques make use of the breadth of experience and knowledge accrued from past compressor designs in the form of empirical or semiempirical correlations to estimate parameters of the flow, such as blockage, loss, and deviation.…”

Section: Introductionmentioning

confidence: 99%

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Development and Applications of a Stage Stacking Procedure

Kulkarni

Celestina

Adamczyk

2012

Volume 8: Turbomachinery, Parts A, B, and C

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Section: Figure 7: Stage 5 Blockage Curves At Various Corrected Speedsmentioning

confidence: 99%

Section: Constructing Stage Performance Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and Applications of a Stage Stacking Procedure

Kulkarni

Celestina

Adamczyk

2012

Volume 8: Turbomachinery, Parts A, B, and C

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“…Retaining an ideal flow coefficient of 0.085, results in a centrifugal compressor with an impeller diameter of 21 mm and a rotational speed of 250,000 rpm. The assumed isentropic total-total efficiency is 74 % [63] while the rated compressor power is 580 W. The impeller optimization has been carried out with a 2D computational fluid dynamics (CFD) model [64] and verified with 3D-CFD simulations. The compressor and power map data for different rotational speeds and variable mass flow are calculated with a 1D-analytical design tool including correction factors based on empirical data from similar small high-speed compressors [65].…”

Section: An Ultra-high Speed Compressormentioning

confidence: 99%

Control of an Ultrahigh-Speed Centrifugal Compressor for the Air Management of Fuel Cell Systems

Zhao

Blunier

Gao

et al. 2014

IEEE Trans. on Ind. Applicat.

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Fuel cell is a power supply system, which takes advantage of the electro-chemical reaction between oxygen and hydrogen to produce electricity with water as its byproduct. Due to their lower pollution and high efficiency compared with fossil fuels, fuel cell systems are under extensive development for many power applications. Compared with high temperature fuel cells (such as molten carbonate fuel cells or solid oxide fuel cells), the proton exchange membrane fuel cell (PEMFC) is more suitable for automotive applications because of its low temperature working condition, thereby a fast startup.Air compressor supplying the oxygen to the stack is an important component in the fuel cell systems. The compressor can consumes up to 20 % of the generated power in the most severe cases. The selecting of the compressor and corresponding control are directly related to the performance of the fuel cell. The size and weight of the air compressor has to be reduced to make them more feasible for automotive applications. Moreover, the control of the air compression system is also an important issue, which affects the efficiency and the safety of the fuel cell. To avoid oxygen starvation of the stack, the mass flow of the supplied air has to be controlled appropriately according to the load demand. Meanwhile, the pressure should not have large deviations or ripples which may damage the stack membrane.In this thesis, the requirements to the compressor for fuel cell applications are discussed. And several kinds of compressor are compared, including positive displacement types and dynamic superchargers. In the view of compactness, an ultra-high speed, up to 280,000 rpm, centrifugal compressor is adopted. The centrifugal compressor which is a kind of dynamics superchargers converts the kinetic energy of the air to the pressure. Compared with positive displacement compressors, it has the advantages of compactness, high efficiency and low noise, making it more suitable for automotive applications. However, the difficulty of the control as well as the surge iv constraint obstructs its industrial implementation for fuel cells.In this dissertation, The model of the air compression system is developed and the coupling between the model inputs and outputs are analyzed. The compressor map is measured and then fitted by a two hidden layer neural network model. The relative gain array (RGA) method is used for the coupling analysis. It shows that the coupling degree varies as the operation point changes because of the nonlinearity of the system. The second part of this work focuses on solving the control problems to adapt the centrifugal compressor to the fuel cell system. The objective is to control the mass flow and pressure simultaneously according to the fuel cell load demand. The problem lies in the coupling between the mass flow control and pressure control because the variations of one variable will also lead to the deviation of the other one. The interaction between the two control loops declines the performance of the fuel cell...

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“…(6), ω hub and ω shroud defined by Hearsy (26) . According to Casey (27) span-wise mass transfer is considered because, due to some mechanisms that lead to an apparent span-wise transport of fluid relative to flow on the mean streamlines such as non-axisymmetric blade-to-blade stream surfaces as result of stream-wise vortices being shed by the blades, secondary flows in the…”

Section: Validationmentioning

confidence: 99%

Performance Analysis of Axial Flow Compressor and Part Load Consideration in a Gas Turbine Application

Asli

Tousi

2013

JTST

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A performance analysis of a three stage axial flow compressor with part load consideration in gas turbine application regarding surge margin is presented in this paper. A three stage compressor was designed and numerical simulation as well as a modified stream line curvature analysis was applied to validate the design model. These two analyses verified the design which was based on a test case model and showed an acceptable accuracy. Performance was predicted by introducing a modified one dimensional method for the compressor. A typical gas turbine with specific components was considered to evaluate the effect of compressor early design parameters on its behavior at part loads. Four compressors were designed with change in reaction ratio and flow coefficient as the input data of the design process. The analysis showed that an increase of 8% and decrease of 5% in reaction ratio and flow coefficient respectively, compared with the base design model, would lead to getting away the running line from the surge line by an amount of 5% approximately and working in a safer margin as well as higher efficiency working range, so the energy conversion can be done efficiently.

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A New Streamline Curvature Throughflow Method for Radial Turbomachinery

Cited by 39 publications

References 19 publications

Development and Applications of a Stage Stacking Procedure

Development and Applications of a Stage Stacking Procedure

Control of an Ultrahigh-Speed Centrifugal Compressor for the Air Management of Fuel Cell Systems

Performance Analysis of Axial Flow Compressor and Part Load Consideration in a Gas Turbine Application

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