Design factors for stable lean premix combustion
Conference
·
OSTI ID:181514
The Advanced Turbine Systems (ATS) program includes the development of low-emission combustors. Low emissions have already been achieved by premixing fuel and air to avoid the hot gas pockets produced by nozzles without premixing. While the advantages of premixed combustion have been widely recognized, turbine developers using premixed nozzles have experienced repeated problems with combustion oscillations. Left uncontrolled, these oscillations can lead to pressure fluctuations capable of damaging engine hardware. Elimination of such oscillations is often difficult and time consuming - particularly when oscillations are discovered in the last stages of engine development. To address this issue, METC is studying oscillating combustion from lean premixing fuel nozzles. These tests are providing generic information on the mechanisms that contribute to oscillating behavior in gas turbines. METC is also investigating the use of so-called {open_quotes}active{close_quotes} control of combustion oscillations. This technique periodically injects fuel pulses into the combustor to disrupt the oscillating behavior. Recent results on active combustion control are presented in Gemmen et al. (1995) and Richards et al. (1995). This paper describes the status of METC efforts to avoid oscillations through simple design changes.
- Research Organization:
- Department of Energy, Morgantown, WV (United States). Morgantown Energy Technology Center
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 181514
- Report Number(s):
- DOE/METC/C--96/7210; CONF-9506162--63; ON: DE96004619; NC: NONE
- Country of Publication:
- United States
- Language:
- English
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