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Fluid Structure Interaction in Compressible Flows

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2020, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
One-way fluid structure interaction (FSI) is explored in two independent scenarios. First, a rectangular single expansion ramp nozzle (SERN) is analyzed through CFD. The SERN was simulated at three conditions: over-expanded, perfectly-expanded, and under-expanded (NPR 3.0, 3.671, and 4.75, respectively). A Schlieren image comparison between CFD results and experiment revealed that there were discrepancies in the location of the shock emanating from the nozzle throat and reflecting through the divergent ramp section. Structural analysis showed that the top plate deforms under load, deflecting outward from the flow by 31 micrometers when over-expanded and nearly 0.3 millimeters when under-expanded. Modal analysis was performed for unloaded, over- and under-expanded conditions, with the first several modes in good agreement with experimental results at the over-expanded condition. For the first four modes found with FEA, all were within 0.7% relative error, except the second mode that was 4.5% different. The second scenario in which FSI is applied is analysis and design of a rotor in a three-row stage with an inlet guide vane (IGV) and outlet guide vane (OGV) of a boundary layer ingesting (BLI) propulsor. The blade shape of the rotor was altered by adjusting the spanwise parameters of thickness distribution, sweep, lean, and chord multiplier in order for the design to satisfy structural requirements. Pressure loads were extracted from CFD and applied to the rotor blade surface for a thorough structural and modal analysis to gather an understanding of how the blade behaved under load. At design speed, the rotor achieved a safety factor of 1.6911 and deformed 0.88 millimeters radially and 5.05 millimeters tangentially. Several modes present possibilities of resonance from perturbations from both IGV and OGV. Although these conditions exist, tuning blade modes to avoid resonance is left to future work.
Mark Turner, Sc.D. (Committee Chair)
Ephraim Gutmark, Ph.D. (Committee Member)
Gui-Rong Liu, Ph.D. (Committee Member)
101 p.

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Citations

  • Holder, J. (2020). Fluid Structure Interaction in Compressible Flows [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin159584692691518

    APA Style (7th edition)

  • Holder, Justin. Fluid Structure Interaction in Compressible Flows. 2020. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin159584692691518.

    MLA Style (8th edition)

  • Holder, Justin. "Fluid Structure Interaction in Compressible Flows." Master's thesis, University of Cincinnati, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin159584692691518

    Chicago Manual of Style (17th edition)