Impact of Defects and Damage in Aircraft Engines on the Exhaust Jet

Adamczuk, Rafael R.; Buske, Clemens; Roehle, I.; Hennecke, Christoph; Dinkelacker, Friedrich; Seume, Joerg R.

doi:10.1115/gt2013-95079

Cited by 11 publications

(4 citation statements)

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“…In that case, damages at the real engine can be detected with appropriate exhaust jet diagnostics without disassembling the engine. The feasibility of this approach has already been shown in first steps [1][2][3][4].…”

Section: Introduction and Methodical Approachmentioning

confidence: 99%

Failure Detection in an Annular Combustion Chamber with Experimental and Numerical Methods

Hennecke¹,

H²,

Dinkelacker³

2017

J Aeronaut Aerospace Eng

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The inspection of aircraft engines is a complex and time-consuming process, usually requiring the disassembly of the engine or extensive baroscopic examinations. Thus, a method is to be developed in order to evaluate the state of the jet engine prior disassembling by analysing the state and structure of the exhaust jet. This could be done for instance with an analysis of the density, temperature, velocity or concentration distribution in a cross section through the exhaust jet. Assumptions are that failures inside the engine influence the exhaust jet in a measurable way and by means of numerical simulations it is possible to evaluate the flow and combustion process beginning in the engines' interior through the exhaust gas jet. A generic study on a pilot scale annular combustion chamber is the basis to show the feasibility of this approach. The combustion chamber consists of eight premixed swirl burners. One of the burners has the option to be operated independently from the others on defined varied operation points. This simulates a failure state of a burner which allows an investigation of the correlation between defined failure states and resulting pattern in the exhaust jet. Detailed techniques are applied to evaluate the approach and the detection limits. Firstly, extensive numerical simulations of possible failure states were conducted to compare with measurements. Secondly, the particle image velocimetry (PIV) technique was used to measure the velocity field in the measurement plane downstream of the combustion chamber. Local reductions of the thermal power lower the acceleration of the exhaust gas and influence the velocity field. Thirdly, species concentrations were measured with a movable probe, evaluated by Fourier-transform infrared (FTIR) spectroscopy. Species concentration information can indicate combustor failures like locally mistuned air-fuel-ratio, serious defects on the swirl vanes, or oil leakages.

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Section: Introduction and Methodical Approachmentioning

confidence: 99%

Failure Detection in an Annular Combustion Chamber with Experimental and Numerical Methods

Hennecke¹,

H²,

Dinkelacker³

2017

J Aeronaut Aerospace Eng

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“…The worst-case defect was a complete shutdown of one burner but it was also shown that even small temperature differences have an impact on exhaust jet patterns of density and temperature. In further work, Adamczuk et al 2 investigated the influence of different hot gas path defects on the density patterns at the outlet plane of a jet engine. The simulated defects included the complete shut-down of a burner, the loss of trailing edge material in the second rotor and stator of a two-stage high-pressure-turbine (HPT), and the increase of the clearance gap between the blade tip and the casing of the second stage rotor of the HPT.…”

Section: Introductionmentioning

confidence: 98%

Experimental demonstration of Analyzing an Engine's Exhaust Jet with the Background-Oriented Schlieren Method

Adamczuk¹,

Hartmann²,

Seume³

2013

AIAA Ground Testing Conference

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“…The method is based on the hypothesis that defects in the combustion chamber lead to characteristic flow temperature patterns in the exhaust jet. These patterns can be measured and allow the classification of damage without having to disassemble the engine, which helps to reduce time and cost during maintenance, repair and overhaul (MRO) (Adamczuk et al, 2013;Hauptmann et al, 2015). To assess damage, the mixing of these patterns in the turbine section must be understood.…”

Section: Introductionmentioning

confidence: 99%

Mixing Behaviour and Propagation of Combustion Chamber Defects in an Aircraft Engine

Ignatidis¹,

Nghiem²,

Goeing³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

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Malfunctions in the combustion chamber of aircraft engines influence downstream turbines. If individual burners vary in their performance, cold or hot streaks can enter and propagate through the turbine section and alter the temperature distribution in the exhaust of the engine. Analysing the variances in the temperature distribution of the exhaust jet provides information on the failure modes of the combustor. This can be used to identify damage to the aircraft engine, accelerate the inspection process and reduce maintenance cost. To investigate the influence of combustor failure on the temperature distribution, CFD simulations of a defined defect are carried out in this paper for a real size gasturbine engine. For this purpose, the total failure of one fuel nozzle in the combustion chamber, which results in a cold gas streak entering the turbine, is simulated. The cold streak is analysed by performing a turbine simulation for which the combustor exit profile is used on as an inlet condition. The simulations were performed using two different techniques. A frozen-rotor approach was used for the steady-state method to estimate the geometric influence on the mixing. The influence of the blade rotation is considered via unsteady simulation. The disturbance width and propagation were determined for both methods. The mixing and dispersion processes are found to be strong in the high pressure part of the turbine and are strongly influenced by the engine rotational speed.

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Impact of Defects and Damage in Aircraft Engines on the Exhaust Jet

Cited by 11 publications

References 0 publications

Failure Detection in an Annular Combustion Chamber with Experimental and Numerical Methods

Failure Detection in an Annular Combustion Chamber with Experimental and Numerical Methods

Experimental demonstration of Analyzing an Engine's Exhaust Jet with the Background-Oriented Schlieren Method

Mixing Behaviour and Propagation of Combustion Chamber Defects in an Aircraft Engine

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