Miniature Turbine for Pulse-Tube/Reverse-Brayton Hybrid Cryocooler

Award Information
Agency:
National Aeronautics and Space Administration
Amount:
$69,972.00
Program:
SBIR
Contract:
NNG04CA69C
Solitcitation Year:
2003
Solicitation Number:
N/A
Branch:
N/A
Award Year:
2004
Phase:
Phase I
Agency Tracking Number:
033341
Solicitation Topic Code:
S2.04
Small Business Information
Atlas Scientific
1367 Camino Robles Way, San Jose, CA, 95120-4925
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
938515913
Principal Investigator
 James Maddocks
 Principal Investigator
 (608) 265-4246
 maddocks@cae.wisc.edu
Business Contact
 Ali Kashani
Title: Business Official
Phone: (408) 507-0906
Email: akashani@atlasscientific.com
Research Institution
N/A
Abstract
Many future advances in NASAys ability to perform cutting edge space science will require improvements in cryogenic system technology, including the development of light-weight, low vibration, highly-efficient, long-life cryocoolers. One such cooler, currently under development, is the pulse-tube/reverse-Brayton (PT/RB) hybrid cooler. Of critical importance to success of the PT/RB is the development of the small-scale turbine required for the reverse-Brayton stage. We propose to build such a turbine for inclusion in a brassboard PT/RB soon to be constructed under a separate contract. The turbine will incorporate pressurized bearings that generate a supporting force by applying a high-pressure source of gas to a flow restriction that exhausts into the bearing clearance and onto the turbine shaft surface. Pressurized bearings provide support even in the absence of shaft rotation and therefore eliminate rubbing contact and increase the life and reliability of the bearing. Also, because pressurized bearings do not directly depend on viscous action for operation, relatively larger clearances can be used without significantly sacrificing rotordynamic performance at low temperatures, thus making them cost effective.

* information listed above is at the time of submission.

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