Abstract
In this paper, a one-dimensional regenerator hydrodynamic model has been developed. In the model, the definition of regenerator friction factor under oscillating flow is different from that for steady flow. A dynamic experimental apparatus has been designed and constructed to investigate the oscillating-flow characteristics of regenerators. In the prototype experimental system, a linear compressor was used to generate the oscillating pressure wave. Three different length regenerators were tested. Detailed experimental data have been obtained for the oscillating pressure and velocity wave that define the flow amplitude and the phase shift characteristics of a high frequency pulse tube cryocooler regenerator. The operational frequency of the system was run at 30 Hz, 40 Hz, 50 Hz and 60 Hz. The oscillating flow friction factor at these operational frequencies is shown in the experimental data. It was found that the relationship between the friction factor under oscillating flow and steady flow varied with the value of the instantaneous Reynolds numbers during one cycle. The ratio is not simply a scaler-multiple relationship as has been reported in other References. The results can be used to predict the performance of a pulse tube cryocooler and should be helpful in the design of a cryogenic regenerator using numerical simulation models.
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