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Dependence of Film Cooling Effectiveness on 3D Printed Cooling Holes

Aghasi, Paul P.
http://orcid.org/0000-0001-5241-0720
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458893416

Abstract Details

2016, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
To investigate the viability of using additive manufacturing technology for flat plate film cooling experiments a new experiential facility was constructed using gas analysis and oxygen sensitive paint as a method of measuring and characterizing film cooling effectiveness for various additive manufacturing technologies as well as aluminum. The ultimate objective of this work is to assess whether these technologies can be a replacement for traditional aluminum CNC machining. Film Cooling Effectiveness is closely dependent on the geometry of the hole emitting the cooling film. These holes are sometimes quite expensive to machine by traditional methods so 3D printed test pieces have the potential to greatly reduce the cost of film cooling tests. What is unknown is the degree to which parameters like layer resolution and the choice of 3D printing technologies influence the results of a film cooling test. A new flat-plate film cooling facility employing the mass transfer analogy (introduction of foreign gas as coolant, not to be confused with the sublimation method) and measurements both by gas sample analysis and oxygen-sensitive paint is first validated using gas analysis and oxygen sensitive paint cross correlation. The same facility is then used to characterize the film cooling effectiveness of a diffuser shaped film cooling hole geometry. These diffuser holes (film hole diameter, D of 0.1 inches) are then produced by a variety of different manufacturing technologies, including traditional machined aluminum, Fused Deposition Modeling (FDM), Stereo Lithography Apparatus (SLA) and PolyJet with layer thicknesses from 0.001D (25 µm) to 0.12D (300 µm). Tests are carried out at mainstream flow Mach number of 0.30 and blowing ratios from 1.0 to 3.5. The coolant gas used is CO2 yielding a density ratio of 1.5. Surface quality is characterized by an Optical Microscope that calculates surface roughness. Test coupons with rougher surface topology generally showed delayed film hole blow off and higher film cooling effectiveness at increased blowing ratios compared to the geometries with lower measured surface roughness.
Ephraim Gutmark, Ph.D. D.Sc. (Committee Chair)
Pepe Palafox, Ph.D. (Committee Member)
David Munday, Ph.D. (Committee Member)
Mark Turner, Sc.D. (Committee Member)
189 p.
Aerospace Materials
Film Cooling; Heat transfer; mass transfer; pressure sensitive paint; roughness; 3D printing

Recommended Citations

Citations

  • Aghasi, P. P. (2016). Dependence of Film Cooling Effectiveness on 3D Printed Cooling Holes [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458893416

    APA Style (7th edition)

  • Aghasi, Paul. Dependence of Film Cooling Effectiveness on 3D Printed Cooling Holes. 2016. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458893416.

    MLA Style (8th edition)

  • Aghasi, Paul. "Dependence of Film Cooling Effectiveness on 3D Printed Cooling Holes." Master's thesis, University of Cincinnati, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458893416

    Chicago Manual of Style (17th edition)

ucin1458893416
1,032
© 2016, some rights reserved.Creative Commons License Dependence of Film Cooling Effectiveness on 3D Printed Cooling Holes by Paul P. Aghasi is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.