An experimental study was conducted to perform an analysis of the effect of the geometric modifications of the venturi on the non-reactive and reactive flow behavior using a counter-rotating radial-radial swirler. In the non-reactive flow tests, measurements were taken in a central vertical plane and horizontal (cross-sectional) plane at the exit of the swirler, using a High-Speed, Two Dimensional, Particle Image Velocimetry (2D PIV) system. The size of the swirler used in the non-reactive flow tests is a 4.76X scaled size of the swirler used in combustion. The 4.76X swirler models were tested in air flow seeded with olive oil at Re = 51,500, corresponding to the pressure drop across the 1X swirler models of 4% of atmospheric pressure at ambient conditions. Compared with the 1X swirler models, the 4.76X swirler models provide high spatial and temporal resolutions from the enhanced visibility of the flow characteristics and lower velocities at the same Re. Four swirler configurations of high swirl number (SN ≈ 1.0) were used, with no modification for the baseline configuration (configuration 1), and with the chevrons on the venturi for the straight chevrons configuration (configuration 2). The design of the inclined venturi was used for the converging venturi configuration (configuration 3), and chevrons were added on the converging venturi for the converging chevrons configuration (configuration 4). In the combustion tests, the 1X swirler models were tested using 478K preheated air at 4% pressure drop across the swirler, and different chamber lengths. Measurements were conducted using a regular camera to capture the flame image, and dynamic pressure transducers to obtain the acoustic pressure oscillations. Four configurations were studied and compared in the non-reactive and reactive flows with the objective of understanding the mechanisms responsible in reducing the extent of the combustion instabilities. Results of this study show that the converging venturi in configuration 3 appears to be the best design in eliminating the combustion instabilities in the fuel-lean region as compared to the other configurations. This indicates that the prevention of the frequencies coupling between the heat release rate and acoustic oscillations has been achieved by using the design of the converging venturi.
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ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
June 26–30, 2017
Charlotte, North Carolina, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5085-5
PROCEEDINGS PAPER
The Effect of the Geometric Modifications of the Venturi on the Non-Reactive Flow and Combustion Behavior Using a Counter-Rotating Radial-Radial Swirler
Sheng-Chieh Lin,
Sheng-Chieh Lin
University of Cincinnati, Cincinnnati, OH
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Xionghui Wang,
Xionghui Wang
University of Cincinnati, Cincinnnati, OH
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Wessam Estefanos,
Wessam Estefanos
University of Cincinnati, Cincinnnati, OH
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Samir Tambe,
Samir Tambe
University of Cincinnati, Cincinnnati, OH
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San-Mou Jeng
San-Mou Jeng
University of Cincinnati, Cincinnnati, OH
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Sheng-Chieh Lin
University of Cincinnati, Cincinnnati, OH
Xionghui Wang
University of Cincinnati, Cincinnnati, OH
Wessam Estefanos
University of Cincinnati, Cincinnnati, OH
Samir Tambe
University of Cincinnati, Cincinnnati, OH
San-Mou Jeng
University of Cincinnati, Cincinnnati, OH
Paper No:
GT2017-64876, V04BT04A053; 12 pages
Published Online:
August 17, 2017
Citation
Lin, S, Wang, X, Estefanos, W, Tambe, S, & Jeng, S. "The Effect of the Geometric Modifications of the Venturi on the Non-Reactive Flow and Combustion Behavior Using a Counter-Rotating Radial-Radial Swirler." Proceedings of the ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. Volume 4B: Combustion, Fuels and Emissions. Charlotte, North Carolina, USA. June 26–30, 2017. V04BT04A053. ASME. https://doi.org/10.1115/GT2017-64876
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