Research Papers: Gas Turbines: Aircraft Engine

Experimental Investigation of Cycle Properties, Noise, and Air Pollutant Emissions of an APS3200 Auxiliary Power Unit

[+] Author and Article Information
Teresa Siebel

German Aerospace Center (DLR),
Institute of Combustion Technology,
Stuttgart 70569, Germany
e-mail: teresa.siebel@dlr.de

Jan Zanger, Andreas Huber, Manfred Aigner

German Aerospace Center (DLR),
Institute of Combustion Technology,
Stuttgart 70569, Germany

Karsten Knobloch, Friedrich Bake

German Aerospace Center (DLR),
Institute of Propulsion Technology,
Berlin 10623, Germany

1Corresponding author.

Contributed by the Aircraft Engine Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 24, 2017; final manuscript received August 17, 2017; published online February 13, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(6), 061201 (Feb 13, 2018) (9 pages) Paper No: GTP-17-1390; doi: 10.1115/1.4038159 History: Received July 24, 2017; Revised August 17, 2017

Auxiliary power unit (APU) operators face increasingly stricter airport requirements concerning exhaust gas and noise emission levels. To simultaneously reduce exhaust gas and noise emissions and to satisfy the increasing demand of electric power on board, optimization of the current technology is necessary. Prior to any possible demonstration of optimization potential, detailed data of thermodynamic properties and emissions have to be determined. Therefore, the investigations presented in this paper were conducted at a full-scale APU of an operational aircraft. A Pratt & Whitney (East Hartford, CT) APS3200, commonly installed in the Airbus A320 aircraft family, was used for measurements of the reference data. In order to describe the APS3200, the full spectrum of feasible power load and bleed air mass flow combinations were adjusted during the study. Their effect on different thermodynamic and performance properties, such as exhaust gas temperature, pressure as well as electric and overall efficiency is described. Furthermore, the mass flows of the inlet air, exhaust gas, and fuel input were determined. Additionally, the work reports the exhaust gas emissions regarding the species CO2, CO, and NOx as a function of load point. Moreover, the acoustic noise emissions are presented and discussed. With the provided data, the paper serves as a database for validating numerical simulations and provides a baseline for current APU technology.

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Fig. 1

Experimental setup: 1—exhaust duct, 2—exhaust probe, 3—bleed air pipe, 4—air inlet, 5—control cabinet, 6—flue gas analyzer

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Fig. 2

Process flow diagram with measured and calculated properties

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Fig. 3

Setup of exhaust gas property measurement; exhaust gas probe = a, ptot = 1, pstat = 2, Tex = I, II, III

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Fig. 4

Position of microphones

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Fig. 5

Measured and calculated mass flows

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Fig. 6

Influence of Pbl ON Pth for constant Pel

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Fig. 7

Influence of Pel ON Pth for constant Pbl

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Fig. 8

Influence of Pov ON ηov and ηel

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Fig. 9

Influence of overall power output on Tex

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Fig. 10

Impact of bleed air power output on Tbl and pbl for constant Pel = 73 kW

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Fig. 11

Influence of Pov on CO emissions for different bleed air and electric loads

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Fig. 12

Influence of Put on NOx emissions for different bleed air and electric loads

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Fig. 13

Spectra of all microphones for operating point without (upper) and with bleed air (lower plot)

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Fig. 14

Spectra of undisturbed microphone for load variations. Upper plot: varied bleed air (maximum electric power), lower plot: varied electric load (maximum bleed air).



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