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심정보(Jung-Bo Sim),장우석(Ou Sek Chang),박자운(JaWoon Park),김영원(Young Won Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Organic Rankine Cycle (ORC) is an eco-friendly thermodynamic system that can generate useful power using unused thermal energy. The ORC consists of an evaporator, a condenser, a pump and a turbine. Among them, the turbine plays an important role in converting the thermal energy of the working fluid to mechanical energy that drives the generator. Therefore, it is very important to design the turbine and verify its performance. A closed loop system can be used to verify the performance of turbine, but it takes a lot of time and money because it used a real refrigerant. Therefore, in this study, an open loop system was used for the air similarity test with the law of similarity. In order to satisfy the similarity law of the turbo machinery, conditions that satisfy geometric, kinematic, and mechanical similarity were selected using the turbine dimensionless number such as flow coefficient and work coefficient. The selected test conditions were an inlet temperature of 80℃, an inlet pressure of 2.0 bar, a rotation speed of 5,000 rpm, and a pressure ratio of 1.05. Furthermore, the process of selecting the air similarity test conditions was described, and the configuration of the test device and the test method were presented.