Show simple item record

dc.contributor.authorFraser, Thomas L.en_US
dc.date.accessioned2007-05-14T14:41:27Z
dc.date.available2007-05-14T14:41:27Z
dc.date.issued2006en_US
dc.identifier.citationFraser, T. (2006). Design of a Cryogenic Turbine for a Hybrid Cryocooler. Master's Thesis, University of Wisconsin-Madison.en_US
dc.identifier.urihttp://digital.library.wisc.edu/1793/7818
dc.descriptionUnder the supervision of Professor Gregory F. Nellis; 179pp.en_US
dc.description.abstractThe 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.en_US
dc.description.sponsorshipSponsored by Atlas Scientific.en_US
dc.format.extent3716234 bytes
dc.format.mimetypeapplication/pdfen_US
dc.format.mimetypeapplication/pdf
dc.publisherUniversity of Wisconsin-Madisonen_US
dc.subjectThesis (M.S.)--University of Wisconsin--Madison, 2006.en_US
dc.subjectDissertations Academic Mechanical Engineering.en_US
dc.subjectUniversity of Wisconsin--Madison. College of Engineering.en_US
dc.titleDesign of a Cryogenic Turbine for a Hybrid Cryocooleren_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record