The Thermal Properties Of The Scroll Expander

The scroll compressor, as a type of high efficiency compressor, is widely serviced in production and living. But the research to the scroll expander is still not satisfying. According to the structural comparability and the relativity of work between the scroll compressor and the scroll expander, this thesis introduces and deduces the geometrical theory on the scroll expander systemically and analyses roundly its performance.On the basis of the geometrical theory on the scroll compressor, a relatively integrated geometrical theory on the scroll expander is deduced and some new parameters are defined in the article. According to the thermodynamic analysis method of the compressing process of the scroll compressor, an in-depth theoretical study and a primary process simulation to the expanding process of the scroll expander are expressed in the paper. And in terms of the study way of the screw expander, efficiency analysis and experimental studies on the scroll expander are given in the thesis.Firstly, this paper introduces the model-line of the scroll expander in detail and deduces integrally the geometrical theory on the scroll expander. Basing on the transparent geometrical relation of the scroll expander, force analysis of the immobile and the rotary turbination are showed in the paper.Secondly, the thermodynamic analysis on the expanding process, the setting-up of the dynamic leakage model and the primary process simulation are expressed in this study. And according to the calculation of the simulation, some graphs are drew, which express the quality, pressure and temperature variation in the scroll room to the revolving angle of the principal axis.At last, the factors of "the leakage" and "the matching" which influence the efficiency of the scroll expander greatly are analyzed and studied synthetically. And the results of the calculation and the experiment are also compared in the article.