Ejector Pump Flow Control for Increased Compressor Operability

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NAS3-02086
Agency Tracking Number: 001451
Amount: $599,820.00
Phase: Phase II
Program: SBIR
Awards Year: 2002
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
1861 Pratt Drive; Suite 2040, Blacksburg, VA, 24060
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Stephen Guillot
 Principal Research Engineer
 (540) 961-7702
Business Contact
 Tamara Murray
Title: Business Manager
Phone: (540) 961-4401
Email: wng@techsburg.com
Research Institution
Advances in rotor and fan blade design have produced compressors that generate greater compression ratios with higher efficiencies using fewer stages. A direct result of designing more compact compressors with higher pressure ratios is a more adverse pressure gradient which causes flow separation on the endwalls of both the rotor and stator passageways. Consequently, the performance potential of the compressor is not reached. Technology in Blacksburg is proposing the use of engine casing and hub flow control in the stator blade rows to increase stator performance and efficiency while simultaneously reducing the length and thus overall weight of the engine. Flow control is achieved with miniature ejector pumps, integrally machined into the hub and casing. Ejector pumps provide a simple and efficient way of simultaneously producing suction and a high momentum jet for flow control. Low momentum fluid in boundary layer of the endwalls is removed with suction. The fluid is then re-energized by the ejector pump and injected into the flow as a high momentum jet flowing tangent to the endwall. In this way, the boundary layer along the wall is provided with the energy necessary to remain attached in an adverse pressure gradient.

* Information listed above is at the time of submission. *

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