Research Papers

A New Loss and Deviation Model for Axial Compressor Inlet Guide Vanes

[+] Author and Article Information
Milan Banjac

e-mail: mbbanjac@mas.bg.ac.rs

Milan V. Petrovic

e-mail: mpetrovic@mas.bg.ac.rs
Faculty of Mechanical Engineering,
University of Belgrade,
Belgrade, Serbia

Alexander Wiedermann

MAN Diesel & Turbo SE,
Oberhausen, Germany
e-mail: alexander.wiedermann@man.eu

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received September 13, 2013; final manuscript received October 15, 2013; published online January 2, 2014. Editor: Ronald Bunker.

J. Turbomach 136(7), 071011 (Jan 02, 2014) (13 pages) Paper No: TURBO-13-1217; doi: 10.1115/1.4025956 History: Received September 13, 2013; Revised October 15, 2013

This paper describes a new universal algebraic model for the estimation of flow deflection and losses in axial compressor inlet guide vane devices. The model deals with nominal flow and far-off-design operating conditions in connection with large stagger angle adjustments. The first part of the model considers deflection and losses in 2D cascades, taking into account the main cascade geometry parameters and operating conditions, such as Mach number and stagger adjustment. The second part of the model deals with additional deviation and losses due to secondary flow caused by the end wall viscous effects and by the trailing vortices. The model is developed for NACA65 airfoils, NACA63-A4K6 airfoils, and airfoils having an NACA65 thickness distribution on a circular-arc camber line. It is suitable for application in 1D or 2D through-flow calculations for design and analysis cases. The development of the method is based on systematic computational fluid dynamics (CFD) flow calculations for various cascade geometries and operating parameters. The comparison of correlation results with experimental data for several test cases shows good agreement.

Copyright © 2014 by ASME
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Fig. 1

Two-dimensional IGV cascade geometry

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Fig. 2

MISES calculation grid for NACA65 cascade

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Fig. 3

Results of MISES calculations for the reference incidence—NACA65 airfoil cascade

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Fig. 4

Results of MISES calculations for the reference incidence—circular camber line airfoils with NACA65 thickness

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Fig. 5

Deviation correction for blade thickness, NACA65 airfoil cascade with 40 deg camber angle

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Fig. 6

MISES calculation grid for NACA63 A4K6 cascade

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Fig. 7

Results of MISES calculations for the reference incidence—NACA63 A4K6 airfoil cascade

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Fig. 8

Additional deviations due to stagger angle adjustment

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Fig. 9

Grid for twisted IGV blades of the LUH three-stage compressor

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Fig. 10

IGV exit flow angle of the LUH three-stage compressor

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Fig. 11

Grid for CFD 2D cascade flow calculations

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Fig. 12

Exit plane and blade circulation

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Fig. 13

Single vortex filament ray and the model for a linear cascade

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Fig. 14

Exit plane nomenclature (left) and radius nomenclature (right)

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Fig. 15

Induced deviation for a row with an approximately constant exit flow angle over the span for IGVs of the Sulzer four-stage compressor

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Fig. 16

Induced deviation for a row with highly twisted blades and spanwise increase of blade circulation

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Fig. 17

Model of a linear cascade

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Fig. 18

Basic distribution of the additional deviation

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Fig. 19

Correlation for secondary flow deviations applied to a 3D cascade

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Fig. 20

Deviation prediction: the developed correlation and CFD results for Sulzer four-stage compressor IGVs (test case 1)

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Fig. 21

Comparison between the developed correlation and CFD results—LUH three-stage compressor IGV deviations (test case 2)

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Fig. 22

Deviation prediction—the developed correlation and experimental data for IGVs consisting of thin sheet plates, test case 3

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Fig. 23

Exit flow angle: comparison between the correlation and experimental data for test case 4

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Fig. 24

IGV exit angle—comparison of the correlation and experimental data for test case 5

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Fig. 25

Loss coefficient for Sulzer four-stage compressor IGV, test case 1

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Fig. 26

Loss coefficient for LUH three-stage compressor IGV, test case 2

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Fig. 27

Streamlines for induced secondary flow (a) and pitchwise distribution for the x component of induced velocity (b), H/s = 2

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Fig. 28

Velocity cxind; comparison between the local, trailing edge value and pitchwise averaged value. Cascade with H/s = 2.

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Fig. 29

Variation of averaging and amplification factors together over the blade span




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