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Numerical Simulation of Multi Stage Pulse Tube Refrigerators

Ghahremani, Amir Reza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41214 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan; Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. Multi stage Pulse Tube Cryocoolers (PTCs) have found the interest of researchers due to its reliability, long life and absence of moving part. This thesis represents a comprehensive numerical simulation method to investigate one and two stage PTC. All components of the PTC are modeled employing the nodal analysis technique to discretize the mass, momentum and energy conservation equations. SUTPTC code has been developed in cryocooler laboratory of Sharif University of Technology (SUT) to analyze and optimize one and two stage cryocooler performance. The SUTPTC code has been validated with the existing experimental data. Employing the proposed code, the effect of precooling temperature, the key geometrical and operating parameters on performance of PTC have been investigated. The key geometrical parameters considered in this thesis are aspect ratios of regenerator and tube sections, length ratio of regenerators and tubes, and type of screen mesh. The main operating parameters considered are average charge pressure, frequency, and position of opening of orifice and bypass. In this respect, first and second laws of thermodynamics have been employed to analyze and optimize the performance of the PTCs
  9. Keywords:
  10. Pulse Tube Refrigrator ; Numerical Simulation ; Finite Volume Method ; Thermodynamic Simulation

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