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Stator-Rotor gap을 통한 냉각유동이 터빈 유동손실에 미치는 영향에 대한 CFD 연구
장주혜(Juhye Jang),주원구(Wongu-Joo) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
To improve the efficiency, turbine inlet temperature has been raised and the temperature exceeds melting points of materials constituting turbine. To protect disk cavities from hot gases, purge flows are injected into mainstream through rim seals. The interaction between purge flows and mainstream induces aerodynamic losses and decrease of efficiency, so proper rim seal geometry is essential. Using CFD numerical analysis, this paper aims to understand the effect of cooling flow on the endwall flow and turbine loss with alteration of distances between rim seal plates and mass flow rate of cooling air. The result of numerical analysis showed that there was a difference in the degree of reverse flow of the interface according to alteration of rim seal geometries. It is found that the rim seal geometry with narrow upper gap and wide lower gap showed the smallest aerodynamic loss.