Title

Hot-Wire Study On The Impact Of Porous Structure On Mean And Turbulent Velocity Profiles In The Near-Field Of A High Aspect Ratio Porous Filled Slot Jet

Abstract

A 2-D rectangular slot jet (AR=61) with a porous blockage is experimentally tested for mean velocity and turbulence profiles in the near field. Porosities of the blockages tested are nominally 0, 0.40, 0.50, and 0.60, all crushed aluminum foam. The presence of the porous blockage can be seen in the deformed mean profile and in the lower magnitudes of turbulence intensity. The porous blockage acts to change the relevant length scale to that more on the order of the pore size rather than the slot width. Using a method meant for standardizing the turbulent length scale calculation, a length scale for each case is calculated and found to vary weakly with respect to porosity. The three length scales are calculated for each case and are compared. The length scale based on the zero frequency extrapolation of the power spectral density gave the most reasonable results. Adiabatic film cooling effectiveness values are given for three blowing ratios for the 0.60 porosity insert. Film effectiveness is seen to increase with mass injected over the entire test surface. © 2011 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Publication Date

12-1-2011

Publication Title

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2011

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

84880677355 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84880677355

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