Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

An Annular Pulsed Detonation Combustor Mockup: System Identification and Misfiring Detection

[+] Author and Article Information
Sascha Wolff

Chair of Measurement and Control,
Department of Process Engineering,
Technische Universität Berlin,
Hardenbergstr. 36a,
Berlin 10623, Germany
e-mail: sascha.wolff@tu-berlin.de

Rudibert King

Chair of Measurement and Control,
Department of Process Engineering,
Technische Universität Berlin,
Hardenbergstr. 36a,
Berlin 10623, Germany
e-mail: rudibert.king@tu-berlin.de

1Corresponding author.

Contributed by the Controls, Diagnostics and Instrumentation Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 15, 2015; final manuscript received August 5, 2015; published online October 13, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(4), 041603 (Oct 13, 2015) (8 pages) Paper No: GTP-15-1326; doi: 10.1115/1.4031320 History: Received July 15, 2015; Revised August 05, 2015

An annular pulsed detonation combustor (PDC) basically consists of a number of detonation tubes which are firing in a predetermined sequence into a common downstream annular plenum. Fluctuating initial conditions and fluctuating environmental parameters strongly affect the detonation. Operating such a setup without misfiring is delicate. Misfiring of individual combustion tubes will significantly lower performance or even stop the engine. Hence, an operation of such an engine requires a misfiring detection. Here, a model-based approach is used which exploits the innovation sequence calculated by a Kalman filter. The model necessary for the Kalman filter is determined based on a modal identification technique. A surrogate, nonreacting experimental setup is considered in order to develop and test these methods.

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Fig. 1

Annular gap with 12 circular holes in the front plate (at z=0) for the connection of surrogate firing tubes/actuators. The dimensions of the system are given by: L = 0.6 m, aR = 0.32 m, R = 0.4 m, and a = 0.8.

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Fig. 2

Experimental setup with DSP, amplifiers, actuators, and sensors

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Fig. 4

Modal identification scheme

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Fig. 3

(a) Particle velocity at a membrane measured by a vibrometer during a simulated detonation event. (b) Normalized integral of the power spectral density of the signal in (a).

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Fig. 5

Frequency responses for the first azimuthal cosine base vector of the experimental plat calculated using a spectral analysis of the identified model which is given by Eqs. (33) and(34)

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Fig. 6

Misfiring detection experiment



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