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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Automatic Detection of Defects in a Swirl Burner Array Through an Exhaust Jet Pattern Analysis

[+] Author and Article Information
Ulrich Hartmann

Institute of Turbomachinery and Fluid Dynamics,
Leibniz Universität Hannover,
Hannover 30167, Lower Saxony, Germany
e-mail: hartmann@tfd.uni-hannover.de

Christoph Hennecke, Friedrich Dinkelacker

Institute of Technical Combustion,
Leibniz Universität Hannover,
Hannover 30167, Lower Saxony, Germany

Joerg R. Seume

Institute of Turbomachinery and Fluid Dynamics,
Leibniz Universität Hannover,
Hannover 30167, Lower Saxony, Germany

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 28, 2016; final manuscript received July 12, 2016; published online September 27, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(3), 031504 (Sep 27, 2016) (8 pages) Paper No: GTP-16-1283; doi: 10.1115/1.4034449 History: Received June 28, 2016; Revised July 12, 2016

A significant challenge in improving the regeneration process of jet engines is the reduction of engine down-time during inspection. As such, early defect detection without engine disassembly will speed up the regeneration process. Defects in the engines hot-gas path (HGP) influence the density distribution of the flow and lead to irregularities in the density distribution of the exhaust jet which can be detected with the optical background-oriented Schlieren (BOS) method in a tomographic setup. The present paper proposes a combination of tomographic BOS measurements and supervised learning algorithms to develop a methodology for an automatic defect detection system. In the first step, the methodology is tested by analyzing the exhaust jet of a swirl burner array with a nonuniform fuel-supply of single burners with tomographic BOS measurements. The measurements are used to implement a support vector machine (SVM) pattern recognition algorithm. It is shown that the reconstruction quality of tomographic BOS measurements is high enough to be combined with pattern recognition algorithms. The results strengthen the hypothesis that it is possible to automatically detect defects in jet engines with tomographic BOS measurements and pattern recognition algorithms.

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Figures

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Fig. 1

Swirl burner array

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Fig. 2

Principle of the BOS method modeled after [12]

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Fig. 3

Tomographic BOS setup at the burner test rig

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Fig. 4

Density distribution in the burners exhaust jet measured with BOS for different output powers of the single burner: (a) PSingle = 10 kW, (b) PSingle = 5 kW, and (c) PSingle = 0 kW

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Fig. 5

Principle of SVM classification

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Fig. 6

Generation of the synthetic training data out of tomographic BOS measurements: (a) parameters obtained from BOS measurements, (b) generation of the training data using a LHS algorithm, and (c) separating hyperplane

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Fig. 7

SVM classification of tomographic BOS measurements

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