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Effect of Corrugated Outer Wall On Operating Regimes of Rotating Detonation Combustors

Knight, Ethan
http://orcid.org/0000-0003-2932-3818
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1523631068586522

Abstract Details

2018, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
The effects of an azimuthally-grooved wall on rotation detonation combustors are investigated for hydrogen-air mixtures. Cause for this investigation came from the narrow range of operating points at which a detonative can operate with a stable, one wave mode. Using previous detonation research for linear detonations, the corrugated design was chosen and implemented into an RDC. Different air flow rates were tested, with equivalence ratios varying between 0.5 and 2 for three different channel widths and two outer-wall geometries — smooth (conventional) and corrugated with triangular obstacles on the outer wall — to compare the two operations. RDC operation with the corrugated wall produced sustained detonation propagation even at very small channel widths (3.18mm-6.35mm) where the smooth geometry failed across different flow rates. The reasons for this difference in operation are further investigated using shadowgraph imaging and reacting two-dimensional numerical simulations, leading to the conclusion that the reflected shock waves and strong vortices, both stemming from the presence of the obstacles, improved the propensity of detonation sustenance within the combustor. The obtained results appear to be in line with the findings from fundamental detonation studies, where similar obstacles tended to produce and sustain the detonations, at otherwise near-limit failure conditions. This presents a promising venue for obtaining rotating detonations in otherwise inoperable conditions of flow rates and mixture reactivity. Furthermore, within the detonative combustion community there has been more investigation into counter rotating modes. Analysis of both geometries show the existence of this mode, however the mode appears to be more pronounced in the conventional, smooth, geometry than the grooved design.
Ephraim Gutmark, Ph.D. (Committee Chair)
Shaaban Abdallah, Ph.D. (Committee Member)
Prashant Khare (Committee Member)
79 p.
Aerospace Materials
Combustion; Shock Interaction; Rotating Detonation; Pressure Gain Combustion; Shadowgraph Visualization; Computational Fluid Dynamics

Recommended Citations

Citations

  • Knight, E. (2018). Effect of Corrugated Outer Wall On Operating Regimes of Rotating Detonation Combustors [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1523631068586522

    APA Style (7th edition)

  • Knight, Ethan. Effect of Corrugated Outer Wall On Operating Regimes of Rotating Detonation Combustors. 2018. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1523631068586522.

    MLA Style (8th edition)

  • Knight, Ethan. "Effect of Corrugated Outer Wall On Operating Regimes of Rotating Detonation Combustors." Master's thesis, University of Cincinnati, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1523631068586522

    Chicago Manual of Style (17th edition)

ucin1523631068586522
243
© 2018, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.