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Research Papers

Influence of Variable Geometry Compressor on Transient Performance of Counter-Rotating Open Rotor Engines

[+] Author and Article Information
Vinícius Tavares Silva

Turbomachines Department,
Aeronautics Institute of Technology (ITA),
São José dos Campos,
São Paulo 12228-900, Brazil
e-mail: viniciustasil@gmail.com

Cleverson Bringhenti

Mem. ASME
Turbomachines Department,
Aeronautics Institute of Technology (ITA),
São José dos Campos,
São Paulo 12228-900, Brazil
e-mail: cleverson@ita.br

Jesuino Takachi Tomita

Mem. ASME
Turbomachines Department,
Aeronautics Institute of Technology (ITA),
São José dos Campos,
São Paulo 12228-900, Brazil
e-mail: jtakachi@ita.br

Olivier Petit

Department of Mechanics and Maritime Sciences,
Chalmers University of Technology,
Gothenburg 41296, SE, Sweden
e-mail: olivier.petit@chalmers.se

Manuscript received January 16, 2018; final manuscript received June 30, 2018; published online August 13, 2018. Assoc. Editor: Scott C. Morris.

J. Eng. Gas Turbines Power 140(12), 121002 (Aug 13, 2018) (10 pages) Paper No: GTP-18-1025; doi: 10.1115/1.4040770 History: Received January 16, 2018; Revised June 30, 2018

This work describes a methodology used for counter-rotating (CR) propellers performance estimation. The method is implemented in an in-house program for gas turbine performance prediction, making possible the simulation of the counter-rotating open rotor (CROR) architecture. The methodology is used together with a variable geometry compressor control strategy to avoid surge conditions. Two cases are simulated under transient operation for both fixed and variable geometry compressor. The influence of the variable geometry control on the transient performance of CROR engines is evaluated and a comprehensive understanding on the transient behavior of this type of engine could be obtained. It is shown that the use of the variable geometry compressor control does not significantly affect the overall engine performance, while avoiding the surge conditions, thus ensuring the engine operation safety.

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Figures

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Fig. 1

Conventional propeller map [30]

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Fig. 2

Counter-rotating propeller flowchart for design point (a) and off-design point (b) calculation

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Fig. 3

Direct drive counter-rotating open rotor model

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Fig. 4

Direct drive CROR running line for LPC map (a) and HPC map (b)

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Fig. 5

Counter-rotating open rotor performance results for fixed geometry and variable geometry control

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Fig. 6

Running line on propeller map

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Fig. 7

Direct drive counter Rotating propeller performance results

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Fig. 8

Geared counter-rotating open rotor model

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Fig. 9

Geared CROR running line for LPC map (a) and HPC map (b)

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Fig. 10

Geared CROR performance results for fixed geometry and variable geometry control

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Fig. 11

Running line on CR propeller map

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Fig. 12

Geared counter rotating propeller performance results

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