A NUMERICAL INVESTIGATION ON THE INTERNAL FLOW CHARACTERISTICS IN TURBINE NOZZLE BY VARIATION OF ITS FLOW AREA

목 면적 변화에 따른 터빈노즐 내부 유동 특성에 관한 수치적 조사

A numerical simulation was performed to investigate the internal flow characteristics in gas turbine nozzle by the variation of flow area of the nozzle. In general the area of turbine nozzle is chosen by the most substantial factor on performance improvement of turbine at the first stage. In the performances test through CFD analysis for three types of nozzle with conventional, enlarged and reduced area, reduced one with effective flow area (EFA) was the most efficient. That is the minimum effective value within EFA limit defined by the manual of technical order had a good performance. It is useful to avoid the low power problem in the test of performance after maintenance and overhaul of turbine engine.