1403 CFD を用いたスクロールエキスパンダー内部流れ解析

概要

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It is necessary to utilize thermal energy for co-generation systems. In order change the low temperature thermal energy into a mechanical power, Rankine cycle using organic fluid is effective. Expander is one of the most important components of the cycle and we choose scroll type expander because of low oscillation. To improve cycle efficiency, expander must be studied precisely. But it is very difficult to measure state of gas in expander in detail. In this study, we have developed a control method of calculation mesh and a model of seal effect between scroll wraps. Using these methods, we have operated computational fluid dynamics in scroll expander. Further, the calculated adiabatic efficiency of expander was compared to experimental one. Finally, we discussed the change of PV-diagram when pressure ratio between inlet and outlet changed.