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Model for Flow Properties Across the Opening of Normal Bleed Holes in Supersonic Flow

Morell, Albert T

Abstract Details

2018, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
Flow separation due to shock-boundary layer interactions within supersonic mixed-compression inlets can be controlled through the bleeding of a portion of the affected boundary layer through rows of bleed holes. It is important to model the bleed system in computational simulations of the inlet flowfield in order to represent its effect on inlet performance. In the present work, computational simulations with and without an incident oblique shock are conducted to evaluate a novel analytical bleed model previously developed by Bunnag to describe the entire flowfield through circular normal bleed holes. The analysis suggests that the Bunnag Model could be improved by taking into account total pressure losses due to the approaching boundary layer, a static pressure at the hole opening higher than plenum pressure due to incomplete expansion, and the tendency of flow to enter or exit the hole opening downstream of the bleed-hole induced shock. An extensively modified version of the model called the Boundary Layer Adjusted Model (BLAM) is proposed to take these factors into account. The BLAM also rejects the use of inviscid, two-dimensional Prandtl-Meyer theory as a means to predict the non-dimensional bleed mass flow rate (Qsonic-B). Rather, the BLAM has been modified to be compatible with empirical bleed rate models developed previously at the NASA Glenn Research Center. Finally, the BLAM is shown to offer a decisive improvement over the original model in its prediction of Mach number profiles over the symmetry line of bleed-hole openings, as assessed relative to CFD predictions. A potential application of the improved model is to resolve bleed-hole openings in computational simulations of inlets and diffusers. Such an approach is expected to improve the modeling of the interaction of bleed with the external flow beyond the capabilities of porous bleed models.
Awatef Hamed, Ph.D. (Committee Chair)
John Slater, Ph.D. (Committee Member)
Mark Turner, Sc.D. (Committee Member)
177 p.

Recommended Citations

Citations

  • Morell, A. T. (2018). Model for Flow Properties Across the Opening of Normal Bleed Holes in Supersonic Flow [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1519909987871461

    APA Style (7th edition)

  • Morell, Albert. Model for Flow Properties Across the Opening of Normal Bleed Holes in Supersonic Flow. 2018. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1519909987871461.

    MLA Style (8th edition)

  • Morell, Albert. "Model for Flow Properties Across the Opening of Normal Bleed Holes in Supersonic Flow." Master's thesis, University of Cincinnati, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1519909987871461

    Chicago Manual of Style (17th edition)