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EXPERIMENTAL INVESTIGATION OF AERODYNAMICS, COMBUSTION, AND EMISSIONS CHARACTERISTICS WITHIN THE PRIMARY ZONE OF A GAS TURBINE COMBUSTOR

ELKADY, AHMED MOSTAFA

Abstract Details

2006, PhD, University of Cincinnati, Engineering : Aerospace Engineering.
The present work investigates pollutant emissions production, mainly nitric oxides and carbon monoxide, within the primary zone of a highly swirling combustion and methods with which to reduce their formation. A baseline study was executed at different equivalence ratios and different inlet air temperatures. The study was then extended to investigate the effects of utilizing transverse air jets on pollutant emission characteristics at different jet locations, jet mass ratio, and overall equivalence ratio as well as to investigate the jets’ overall interactions with the recirculation zone. A Fourier Transform Infrared (FTIR) spectrometer was employed to measure emissions concentrations generated during combustion of Jet-A fuel in a swirl-cup assembly. Laser Doppler Velocimetry (LDV) was employed to investigate the mean flow aerodynamics within the combustor. Particle Image Velocimetry (PIV) was utilized to capture the instantaneous aerodynamic behavior of the non-reacting primary zone. Results illustrate that NOx production is a function of both the recirculation zone and the flame length. At low overall equivalence ratios, the recirculation zone is found to be the main producer of NOx. At near stoichiometric conditions, the post recirculation zone appears to be responsible for the majority of NOx produced. Results reveal the possibility of injecting air into the recirculation zone without altering flame stability to improve emission characteristics. Depending on the jet location and strength, nitric oxides as well as carbon monoxide can be reduced simultaneously. Placing the primary air jet just downstream of the fuel rich recirculation zone can lead to a significant reduction in both nitric oxides and carbon monoxide. In the case of fuel lean recirculation zone, reduction of nitric oxides can occur by placing the jets below the location of maximum radius of the recirculation zone.
Dr. San-Mou Jeng (Advisor)
184 p.

Recommended Citations

Citations

  • ELKADY, A. M. (2006). EXPERIMENTAL INVESTIGATION OF AERODYNAMICS, COMBUSTION, AND EMISSIONS CHARACTERISTICS WITHIN THE PRIMARY ZONE OF A GAS TURBINE COMBUSTOR [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155829803

    APA Style (7th edition)

  • ELKADY, AHMED. EXPERIMENTAL INVESTIGATION OF AERODYNAMICS, COMBUSTION, AND EMISSIONS CHARACTERISTICS WITHIN THE PRIMARY ZONE OF A GAS TURBINE COMBUSTOR. 2006. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155829803.

    MLA Style (8th edition)

  • ELKADY, AHMED. "EXPERIMENTAL INVESTIGATION OF AERODYNAMICS, COMBUSTION, AND EMISSIONS CHARACTERISTICS WITHIN THE PRIMARY ZONE OF A GAS TURBINE COMBUSTOR." Doctoral dissertation, University of Cincinnati, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155829803

    Chicago Manual of Style (17th edition)