Repository: Freie Universität Berlin, Math Department

Fuel injection control for a valve array in a Shockless Explosion Combustor

Schäpel, J.S. and King, R. and Yücel, F. and Völzke, F. and Paschereit, O. C. and Klein, R. (2018) Fuel injection control for a valve array in a Shockless Explosion Combustor. In: ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, June 11–15, 2018, Oslo, Norway.

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Approximate constant volume combustion (aCVC) is a promising way to optimize the combustion process in a gas turbine, which would exceed the gain in efficiency resulting from optimizing other components significantly. This work deals with a recently proposed approach: shockless explosion combustion (SEC). Compared to already known concepts, such as pulsed detonation combustion (PDC), it overcomes several disadvantages, e.g., sharp pressure transitions and entropy generation due to shock waves. For an SEC, accurate fuel stratification is required to achieve a quasi-homogeneous auto-ignition. In an atmospheric test rig quasi-homogeneous ignitions were achieved previously in non-resonant operation. To achieve a resonant operation, which goes along with a higher firing frequency, lower ignition and injection times are required. For this purpose, an array of solenoid valves was designed to allow for highly dynamic operation within short filling time spans. Using a novel mixed-integer control approach, these solenoid valves were actuated such that a desired fuel profile was generated. In this paper, the mentioned test rig was used for non-reacting fuel measurements to compare the quality of the axial fuel stratification achieved by using the valve array with the one achieved by using a slower proportional valve. In the experimental investigation the actuation with the valve array proved to adjust the required fuel stratification with the same quality as the actuation with the proportional valve, which was already successfully applied to the reactive set-up. Hence, the mixed-integer controlled valve array is considered a useful concept for upcoming resonant reactive SEC investigations.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Paper No. GT2018-75295, pp. V006T05A007
Subjects:Mathematical and Computer Sciences > Mathematics > Applied Mathematics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group
ID Code:2321
Deposited By: Ulrike Eickers
Deposited On:18 Mar 2019 13:03
Last Modified:19 Mar 2019 14:16

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