Thermoacoustic resonance is a difficult technical problem that is experienced by almost all lean-premixed combustors. The Industrial Trent combustor is a novel dry-low-emissions (DLE) combustor design, which incorporates three stages of lean premixed fuel injection in series. The three stages in series allow independent control of two stages — the third stage receives the balance of fuel to maintain the desired power level — at all power conditions. Thus, primary zone and secondary zone temperatures can be independently controlled. This paper examines how the flexibility offered by a 3-stage lean premixed combustion system permits the implementation of a successful combustion noise avoidance strategy at all power conditions and at all ambient conditions. This is because at a given engine condition (power level and day temperature) a characteristic “noise map” can be generated on the engine, independently of the engine running condition. The variable distribution of heat release along the length of the combustor provides an effective mechanism to control the amplitude of longitudinal resonance modes of the combustor. This approach has allowed the Industrial Trent combustion engineers to thoroughly “map out” all longitudinal combustor acoustic modes and design a fuel schedule that can navigate around regions of combustor thermoacoustic resonance. Noise mapping results are presented in detail, together with the development of noise prediction methods (frequency and amplitude) that have allowed the noise characteristics of the engine to be established over the entire operating envelope of the engine.
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ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition
June 7–10, 1999
Indianapolis, Indiana, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7859-0
PROCEEDINGS PAPER
Industrial Trent Combustor — Combustion Noise Characteristics
Thomas Scarinci,
Thomas Scarinci
Rolls-Royce Canada, Dorval, QC, Canada
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John L. Halpin
John L. Halpin
Rolls-Royce Canada, Dorval, QC, Canada
Search for other works by this author on:
Thomas Scarinci
Rolls-Royce Canada, Dorval, QC, Canada
John L. Halpin
Rolls-Royce Canada, Dorval, QC, Canada
Paper No:
99-GT-009, V002T02A003; 8 pages
Published Online:
December 16, 2014
Citation
Scarinci, T, & Halpin, JL. "Industrial Trent Combustor — Combustion Noise Characteristics." Proceedings of the ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations. Indianapolis, Indiana, USA. June 7–10, 1999. V002T02A003. ASME. https://doi.org/10.1115/99-GT-009
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