Novel Twin-Screw Stirling Cycle Machine for Cryogenic and Refrigeration Applications

Mahkamov, Khamid; Makhkamova, Irina; Kahwash, Fadi

Abstract

This paper describes design and principles of operation of a novel rotary type Stirling cycle machines based on rotary positive displacement mechanisms such as twin-screw, gate rotor screw, scroll, and conical screw compressors and expanders. When these mechanisms are used as separate expanding or compressing machines, the flow of the gas is one-directional with volumes of chambers varying in accordance with a saw-tooth type function. The proposed design solution combines at least two units of gas-coupled compressor and expander arrangements with a required shift in the shaft angle. Every unit has a series of gas channels for timing the connection of its compressor and expander parts. Units are connected to each other via a set of heat exchangers, which are conventional for Stirling cycle machines: recuperative cooling and warm heat exchangers with a regenerator, built between them. The operational capability is demonstrated using three-dimensional CFD simulations. Computational results demonstrate reciprocating flow of the gas between units, as in conventional Stirling machines, and functioning of the proposed design as a multi-cylinder, double acting Stirling machine. The suggested design makes it possible to achieve full dynamic balancing, especially in the case of twin-screw and gate rotor mechanisms, due to the rotation of screws around their axes. It also eliminates a number of problems, which are specific to Stirling machines with reciprocating pistons and their kinematic drive mechanisms.

Citation

Mahkamov, K., Makhkamova, I., & Kahwash, F. (2018, November). Novel Twin-Screw Stirling Cycle Machine for Cryogenic and Refrigeration Applications. Presented at ASME 2018 International Mechanical Engineering Congress and Exposition, Pittsburgh, Pennsylvania, USA

• Presentation Conference Type: Conference Paper (published)
• Conference Name: ASME 2018 International Mechanical Engineering Congress and Exposition
• Start Date: Nov 9, 2018
• End Date: Nov 15, 2018
• Acceptance Date: Sep 30, 2018
• Online Publication Date: Jan 15, 2019
• Publication Date: Nov 9, 2018
• Deposit Date: Apr 26, 2021
• Publisher: American Society of Mechanical Engineers
• Book Title: ASME 2018 International Mechanical Engineering Congress and Exposition
• ISBN: 9780791852071
• DOI: https://doi.org/10.1115/imece2018-86853
• Public URL: http://researchrepository.napier.ac.uk/Output/2764390