Combustion technology for low-emissions gas-turbines: Selected phenomena beyond NO{sub x}
- GE Research and Development Center, Schenectady, NY (United States)
Since recent reviews cover the issues in NO{sub x} formation under gas-turbine conditions, and since regulations essentially dictate use of the premixed mode of combustion for minimum NO{sub x}, this review concentrates on phenomena that can arise in premixed combustion. Specifically, (1) the initial unmixedness in a fuel-air premixer has been shown to make overall lean mixtures autoignite sooner than might be expected based on the overall fuel-air ratio, because the richer portions of the mixture lead the process; (2) combustion pressure oscillations caused by the interplay between acoustic waves and unsteady heat release in a one-dimensional system can be calculated in good accordance with measured data, and set the stage for multi-dimensional CFD; (3) carbon deposition arising from the flow of liquid fuel over metal surfaces such as found in fuel injectors and swirl cups has been described as a function of temperature and of surface composition; and (4) quenching and subsequent emissions of carbon monoxide can be minimized by preservation of a boundary-layer rather than an impingement type of flow over combustor liners.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 377885
- Journal Information:
- Journal of Energy Resources Technology, Vol. 118, Issue 3; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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