21-25 July 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

C1Or1C-02: Numerical Modeling and Loss Analysis of Pneumatically-Driven Gifford-McMahon Cryocooler

22 Jul 2019, 11:15
15m
Level 6, Room 22-23 ()

Level 6, Room 22-23

Speaker

Dr Tian Lei (Sumitomo (SHI) Cryogenics of America, Inc.)

Description

Pneumatically-driven displacer mechanisms are widely used in Gifford-McMahon (G-M) cryocoolers. Particularly for large size G-M cryocoolers, this type of drive is preferable compared to the scotch yoke type, as only a small motor is required for driving the rotary valve and, therefore, the entire cryocooler can be very compact. Though various numerical models of G-M cryocoolers have been presented in the past, modeling of the pneumatically-driven type has rarely been done in previous works. This work presents a one-dimensional numerical model of a pneumatically-driven single stage G-M cryocooler running at 80 K and related studies. The transient model is developed by solving mass, simplified momentum and energy equations numerically in both spatial and temporal domains. In addition, the model predicts the movement of the displacer simultaneously and uses it as an input to simulate the cryocooler performance. The impact of displacer movement on cycle performance is studied first. Then this model is further used to analyze and quantify various losses in the defined cryocooler.

Primary authors

Dr Tian Lei (Sumitomo (SHI) Cryogenics of America, Inc.) Dr Yuri Zuev (Sumitomo (SHI) Cryogenics of America, Inc.) Dr Ralph Longsworth (Sumitomo (SHI) Cryogenics of America, Inc.) Mr Stephen Dunn (Sumitomo (SHI) Cryogenics of America, Inc.) Mr Qian Bao (Sumitomo (SHI) Cryogenics of America, Inc.) Dr Mingyao Xu (Sumitomo (SHI) Cryogenics of America, Inc.)

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