Structural Study on Moving Magnet Compressor for Stirling Engine
The article describes a structural study on moving magnet compressor for Stirling engine. The performance of Stirling engine is determined by the linear compressor. The article first establishes mathematics models for ordinary linear compressors and moving magnet compressors manufactured for test and analysis, then studies magnetic field distribution of linear moving magnet compressor by CAE, the results show that magnet analysis has an agreement with the measurements. A modified moving magnet compressor prototype is proposed based on the results.
A study on the linear compressor characteristics of the Stirling cryocooler
Abstract The purpose of this study is to analyze the characteristics of the linear compressor for Stirling cryocooler. To ensure high performance and long life of the free piston, free displacer Stirling cryocooler, the operating parameters of the linear compressor should be optimized. The experimental results show the operating frequency of the linear compressor has significant effect to the input power characteristics, and the compressor with higher charging pressure of working fluid has high pressure ratio. For the high performance of the linear compressor, compressor has uniform magnetic force with different stroke, and the optimal operating frequency with respect to the charging pressure.
Prediction of natural frequency of the NASA 80 K cooler by the stirling refrigerator performance model
Abstract A computer model known as the Stirling refrigerator performance model (SRPM) has been developed to study Stirling refrigerators. A detailed description of this model can be found elsewhere. Excellent agreement was found between the predictions of the SRPM and the experimental results for a number of Stirling coolers, including Lucas coolers, a Philips/NASA magnetic bearing unit, Oxford refrigerators and the Lockheed/Lucas built Atmospheric Infrared Sounder (AIRS) coolers, units A, B and C. In this paper, the performance of the NASA 80 K cooler, as predicted by the SRPM model, is presented. In particular, the prediction of the natural frequency and the motor force will be discussed in detail.