Conveners
C3PoA - Pulse Tube Cryocoolers (Aerospace)
- Pierre Crespi (Air Liquide Advanced Technologies)
- Carl Kirkconnell (West Coast Solutions)
Stirling-Type Pulse Tube Cryocooler is widely used in Aerocrafts which are often faced with changing acceleration. While the performance of the cryocooler will decay at the circumstance. Experiments find that both the cryogen’s temperature field in the cold finger and the Compressor’s pistion gap are affected by variable acceleration. A model is made for analyzing the changing of their...
High frequency pulse tube cryocooler has many advantages，including simple and compact structure, no moving components at cold head, low vibration and low noise. Thus it has become the widespread refrigeration equipment in aerospace field. But the temperature of single-stage pulse tube cryocooler is difficult to reach the temperature range of liquid hydrogen now. In order to reach the...
Two-cold-finger pulse tube cryocooler is used to meet the demand of multi-temperature refrigeration. It contains a linear compressor and two cold fingers. A series of cold fingers are tested respectively in this paper first. Then, any two of these cold fingers are chosen to connect the compressor and their performance are tested. Finally, the coupling results are compared. The results show...
In order to design a high efficient and high-performance pulse tube cryocooler the appropriate size of the cold finger must be found. This study aims to find the relationship between the size and performance of the high frequency miniature pulse tube cryocooler by combining experiment and numerical simulation. The experiments are carried out by changing two aspect: diameter and length of the...
The inertance of Stirling type pulse tube coolers is an efficient solution for the phase shifter in the 50 – 80 K cooling range. For lower temperature, and especially below 20 K, the phase shifting effect required for the most efficient operation cannot be reached using only inertance. We propose here a new type of phase shifter based on the use of an inertance filled with a high density fluid...
Miniaturization of pulse tube cryocoolers is required for some particular applications, where size and mass for devices are limited, especially in the area of space technology. The high frequency operation leads to reduced pulse tube cryocooler volume for a given cooling power. So the high frequency pulse tube cryocoolers have high energy density and compact structure. Aiming at improving the...
A gas-coupled two-stage Stirling-type coaxial pulse tube cryocooler driven by a dual-opposed-piston configuration linear compressor was designed and manufactured with numerical simulation and experiment test based on a high-capacity single-stage pulse tube cryocooler operating at around 40 K. The material and filling method of the regenerator was studied. The mixed stainless steel with...
This paper will introduce our recent experimental results of high frequency pulse tube refrigerator. To achieve a temperature below 10 K, two types of two-stage configuration, gas coupled and thermal coupled, have been designed, built and tested. At present, both types can achieve a no-load temperature below 10 K by using only one compressor. The configuration, the phase shifters and the...
