구심터빈 탈설계 성능예측에서의 손실모델 영향

Abstract

Recently, radial-type turbine, which adopted refrigerant instead of air as the working fluid, is applied for power generation from renewable energy such as waste heat or solar energy. A lot of researches on the radial-type turbine used various working fluid have been progressed. In this study, several loss models are used to perform the performance prediction of turbines. The effects of each loss model are investigated and the correct direction for performance prediction is suggested. For this purpose, the loss at the nozzle, the expansion loss at the trailing edge of the nozzle, the loss in the vaneless space, the profile loss at the rotor, the incident loss, the windage loss, the tip clearance loss, and the rotor trailing edge loss are applied. The results of the performance prediction are compared with the previous experimental results. The most influential loss is the profile loss, and the difference of the prediction result occurs according to the profile loss model.