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Coupled Transpired and Discretely Injected Films

Award Information

National Aeronautics and Space Administration
Award ID:
Program Year/Program:
2011 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Spectral Energies, LLC
5100 Springfield Street Suite 301 Dayton, OH -
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2011
Title: Coupled Transpired and Discretely Injected Films
Agency: NASA
Contract: NNX11CD94P
Award Amount: $99,698.00


NASA, and all users of turbomachinery, continuously requires improvements in engine durability and efficiencies. As combustion engineers push turbine inlet temperatures to new extremes, cooling designers are faced with increasing heat loads and less available coolant usage. Surface cooling techniques such as film cooling have proven invaluable in this quest. Films generated by forcing the coolant to bleed through a porous substrate have been shown to perform substantially better than discrete film injection in a thermal sense. However, the associated aerodynamic penalties limit the application. On the other hand, discretely injected films have drawbacks as well, including non-uniform coolant profiles significant mixing with the hot working fluid, lowering their effectiveness. Spectral Energies, LLC and the University of Central Florida propose a novel, low risk approach to surface cooling wherein traditional discrete film holes are embedded within a transpiring porous strip. The motivation behind this approach is multi-faceted, with the ultimate goal of developing a cooling arrangement which possesses the thermo-mechanical benefits of a transpired film, the aerodynamic benefits of discrete film injection, and mixing characteristics that are some compromise of the two.

Principal Investigator:

Sivaram Gogineni
Principal Investigator

Business Contact:

Sivaram Gogineni
Business Official
Small Business Information at Submission:

Spectral Energies, LLC
5100 Springfield Street, Suite 301 Dayton, OH 45431-1262

EIN/Tax ID: 020780873
Number of Employees:
Woman-Owned: Yes
Minority-Owned: No
HUBZone-Owned: No