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저온 유기랭킨사이클(ORC)를 적용한 20-kW급 축류 터빈 설계
장우석(Ou Sek Chang),심정보(Jung-Bo Sim),장현서(Hyeon Seo Jang),김영원(Young Won Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Organic Rankine Cycle (ORC) is a thermodynamic cycle that can generate electricity using the low-enthalpy of the heat. The core of ORC is a turbine that mechanically connected to a generator and it converts energy of a pressurized fluid into work to produce electricity. Turbine is classified into a radial flow turbine and an axial flow turbine according to the flow direction. Here we designed a single-stage axial flow turbine powered by a low-temperature heat source for ORC applications. We first carried out a preliminary design and then conducted mean-line analysis for the detailed turbine design using a commercial software of AxSTREAM. The power and the efficiency of the turbine were calculated to be 20 kW and 80%, respectively. The small single-stage axial turbine designed in the present study can be applied to the power generation which fits into the ORC skid for the future study.
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.