Details
| Original language | English |
|---|---|
| Publication status | Published - 22 Jun 2013 |
| Event | AIAA Ground Testing Conference - San Diego, CA, United States Duration: 24 Jun 2013 → 27 Jun 2013 |
Conference
| Conference | AIAA Ground Testing Conference |
|---|---|
| Country/Territory | United States |
| City | San Diego, CA |
| Period | 24 Jun 2013 → 27 Jun 2013 |
Abstract
The regeneration process of jet engines is complex, time-consuming, expensive, and often requires an engine disassembly or boroscopic examination. The reduction of the down time of each engine during the inspection is one of the main challenges for improving the regeneration process. This can be achieved by obtaining the necessary information about damaged components earlier in the regeneration process. The paper presents the application of the Background-Oriented Schlieren (BOS) method for measuring the density distribution of the exhaust jet as a promising approach. In a tomographic set-up, the BOS-method resolves three-dimensional variation in the density pattern of an exhaust jet. By analyzing and comparing the pattern to a design state, conclusions on the condition of the engine's hot gas path components can be drawn. In order to demonstrate the feasibility of this approach, the present paper deals with the tomographic measurement of the exhaust jet of a helicopter engine with a two-stage axial turbine. Two different conditions are measured and compared. In order to simulate a defect which is associated with a change in the temperature distribution, a cold air streak is injected into the exhaust jet. The comparison with the undisturbed reference condition confirms experimentally that even small defects barely mix with the surrounding flow and therefore can be identified with BOS. The present experiments strengthen the hypothesis that tomographic BOS measurements can resolve small density gradients which result from defects in the hot gas path.
ASJC Scopus subject areas
- Engineering(all)
- Aerospace Engineering
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2013. Paper presented at AIAA Ground Testing Conference, San Diego, CA, United States.
Research output: Contribution to conference › Paper › Research › peer review
}
TY - CONF
T1 - Experimental demonstration of Analyzing an Engine’s Exhaust Jet with the Background-Oriented Schlieren Method
AU - Adamczuk, Rafael R.
AU - Hartmann, Ulrich
AU - Seume, Joerg R.
N1 - Funding information: The paper presents research results of the Collaborative Research Center 871, sub-project A3, which is funded by the Deutsche Forschungsgemeinschaft.
PY - 2013/6/22
Y1 - 2013/6/22
N2 - The regeneration process of jet engines is complex, time-consuming, expensive, and often requires an engine disassembly or boroscopic examination. The reduction of the down time of each engine during the inspection is one of the main challenges for improving the regeneration process. This can be achieved by obtaining the necessary information about damaged components earlier in the regeneration process. The paper presents the application of the Background-Oriented Schlieren (BOS) method for measuring the density distribution of the exhaust jet as a promising approach. In a tomographic set-up, the BOS-method resolves three-dimensional variation in the density pattern of an exhaust jet. By analyzing and comparing the pattern to a design state, conclusions on the condition of the engine's hot gas path components can be drawn. In order to demonstrate the feasibility of this approach, the present paper deals with the tomographic measurement of the exhaust jet of a helicopter engine with a two-stage axial turbine. Two different conditions are measured and compared. In order to simulate a defect which is associated with a change in the temperature distribution, a cold air streak is injected into the exhaust jet. The comparison with the undisturbed reference condition confirms experimentally that even small defects barely mix with the surrounding flow and therefore can be identified with BOS. The present experiments strengthen the hypothesis that tomographic BOS measurements can resolve small density gradients which result from defects in the hot gas path.
AB - The regeneration process of jet engines is complex, time-consuming, expensive, and often requires an engine disassembly or boroscopic examination. The reduction of the down time of each engine during the inspection is one of the main challenges for improving the regeneration process. This can be achieved by obtaining the necessary information about damaged components earlier in the regeneration process. The paper presents the application of the Background-Oriented Schlieren (BOS) method for measuring the density distribution of the exhaust jet as a promising approach. In a tomographic set-up, the BOS-method resolves three-dimensional variation in the density pattern of an exhaust jet. By analyzing and comparing the pattern to a design state, conclusions on the condition of the engine's hot gas path components can be drawn. In order to demonstrate the feasibility of this approach, the present paper deals with the tomographic measurement of the exhaust jet of a helicopter engine with a two-stage axial turbine. Two different conditions are measured and compared. In order to simulate a defect which is associated with a change in the temperature distribution, a cold air streak is injected into the exhaust jet. The comparison with the undisturbed reference condition confirms experimentally that even small defects barely mix with the surrounding flow and therefore can be identified with BOS. The present experiments strengthen the hypothesis that tomographic BOS measurements can resolve small density gradients which result from defects in the hot gas path.
UR - http://www.scopus.com/inward/record.url?scp=84883472672&partnerID=8YFLogxK
U2 - 10.2514/6.2013-2488
DO - 10.2514/6.2013-2488
M3 - Paper
AN - SCOPUS:84883472672
T2 - AIAA Ground Testing Conference
Y2 - 24 June 2013 through 27 June 2013
ER -