Abstract
Radial-type turbines are used in not only aviation engine but also a variety of applications such as automotive turbochargers and power generation equipment. When the turbine cannot always operate at a constant mass flow rate depending on the operating conditions, variable nozzles are used to increase the efficiency. However, a gap between the nozzle and the wall is needed in order to adjust the nozzle according to the mass flow rate. In this study, an investigation on the performance change of a turbine was carried out with various gap clearances. For this purpose, a numerical method and a prediction method using loss models are applied. Each method was compared with the existing experimental results. The comparison of the two results shows a fairly consistent result, and the total efficiency in the turbine decreases by 1.6% for every 1% increase in gap clearance.
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