Analysis and performance prediction of electromagnetically-driven free displacer Stirling cryocooler

✍ Scribed by P.R. Tailor; K.G. Narayankhedkar

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 581 KB
• Volume: 28
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(88)90103-8

✦ Synopsis

A new approach to determine the pressure fluctuatmns in the workspace of the free d~splacer St~rhng cryocooler utd~zmg the modffmd form of correlatmn for flow fnctmn factor has been adopted here These equations of pressure fluctuations are used to solve the equation of motion of the free d~splacer resulting m equations of the amphtude of displacer motion and phase shift between p~ston and dmplacer motion Applying the perfect gas law to the mass of gas m the regenerator, instantaneous pressure in the dead space ~s determined SImdarly, equations of the amphtude of piston mot,on and phase shift between piston and apphed voltage have also been obtained Th~s analys~s shows that the coefficient of performance of the perfect regeneratwe free dmplacer Stirhng cryocooler ~s a function of the kinematic wscos~ty ratio instead of temperature ratio as m the case of Schm~dt cycle analys,s The comparison of predicted performance using both Schmldt techmque and this approach with expenmental results are also presented Keywords cryocoolers, pressure measurement, mathemat,cal models Nomenclature