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INNOVATIVE TECHNIQUES TO IMPROVE MIXING AND PENETRATION IN SCRAMJET COMBUSTORS

MURUGAPPAN, SHANMUGAM
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109697512

Abstract Details

2005, PhD, University of Cincinnati, Engineering : Aerospace Engineering.
Scramjet combustors are characterized by an extremely short residence time for the completion of fuel atomization, mixing and combustion. It is therefore desired to develop fuel injection schemes that will accelerate the mixing process by improving penetration, achieving small-dispersed fuel droplets, and enhancing mixing. To date, scramjet-fueling schemes require multiple fuel-injection locations in conjunction with flame-holding cavities. This thesis involves the design, development and testing of two innovative fuel injection strategies that could be used to precisely enhance mixing and control the fuel distribution in a scramjet combustor. The first approach employs a high frequency-forcing injector where the amplitude and frequency of excitation was chosen to affect both jet spread and penetration depth, independently, by excitation at different jet instability modes. Another novel fuel injection technique is to employ a vortex-breakdown-controlled injector, which includes a swirling annular jet combined with a control non-swirling jet. The vortex is stabilized by injection of a continuous jet near the core of the vortex. When the control jet introduces additional momentum along the vortex mean flow, the breakdown is delayed. This has been used to control both the intensity of vortex breakdown and penetration of the jet, which could be effectively applied to enhance mixing and penetration.
Dr. Ephraim Gutmark (Advisor)
193 p.
Engineering, Aerospace
Supersonic; Mixing; Scramjets; Fuel Injection

Recommended Citations

Citations

  • MURUGAPPAN, S. (2005). INNOVATIVE TECHNIQUES TO IMPROVE MIXING AND PENETRATION IN SCRAMJET COMBUSTORS [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109697512

    APA Style (7th edition)

  • MURUGAPPAN, SHANMUGAM. INNOVATIVE TECHNIQUES TO IMPROVE MIXING AND PENETRATION IN SCRAMJET COMBUSTORS. 2005. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109697512.

    MLA Style (8th edition)

  • MURUGAPPAN, SHANMUGAM. "INNOVATIVE TECHNIQUES TO IMPROVE MIXING AND PENETRATION IN SCRAMJET COMBUSTORS." Doctoral dissertation, University of Cincinnati, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109697512

    Chicago Manual of Style (17th edition)

ucin1109697512
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© 2005, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.