Design of a Cryogenic Turbine for a Hybrid Cryocooler
File(s)
Date
2006Author
Fraser, Thomas L.
Publisher
University of Wisconsin-Madison
Metadata
Show full item recordAbstract
The hybrid pulse tube-reverse Brayton cycle cryocooler has the potential for cooling to
temperatures on the order of 10 K. By using the rectifying interface which converts the
oscillating pulse tube flow to continuous flow, both vibrations and low temperature
regenerator losses are overcome, making the hybrid an ideal candidate for cooling
infrared focal plane arrays which demand low temperature and low vibration. However,
the turboexpander within the reverse Brayton cycle is complex and its performance is
highly dependent on the performance of its subcomponents, thus necessitating a model
predicting the turboexpander performance.
A model was developed to predict the performance of the reverse Brayton cycle stage
including the recuperative heat exchanger and turboexpander components. The
turboexpander was numerically modeled in detail to include the sub-models of
rotordynamics, the thermal and leakage performance of the seal, and the turboalternator.
Where possible, the models were verified against either an analytical model or
experimental data. A parametric analysis was carried out to determine the optimal design
and conditions for the turboexpander.
Subject
Thesis (M.S.)--University of Wisconsin--Madison, 2006.
Dissertations Academic Mechanical Engineering.
University of Wisconsin--Madison. College of Engineering.
Permanent Link
http://digital.library.wisc.edu/1793/7818Description
Under the supervision of Professor Gregory F. Nellis; 179pp.
Citation
Fraser, T. (2006). Design of a Cryogenic Turbine for a Hybrid Cryocooler. Master's Thesis, University of Wisconsin-Madison.