Effect of Various Coolant Mass Flow Rates on Sealing Effectiveness of Turbine Blade Rim Seal at First Stage Gas Turbine Experimental Facility

Seok Min Choi, Seungyeong Choi and Hyung Hee Cho
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Seok Min Choi: Department of Plant Technology Energy Systems Research Division, Korea Institute of Machinery & Materials, Daejeon 34103, Korea
Seungyeong Choi: Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea
Hyung Hee Cho: Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea

Energies, 2020, vol. 13, issue 16, 1-16

Abstract: The appropriate coolant mass flow of turbine blade rim seal has become an important issue as turbine blades are exposed to increasingly higher thermal load owing to increased turbine inlet temperature. If the coolant is deficient, hot gas ingresses to the rim seal, or if sufficient, the efficiency of turbine decreases. Therefore, we analyzed sealing effectiveness of rim seal derive appropriate coolant mass flow rate at various conditions. The experimental facility was modified from one designed for an aero-engine gas turbine. Rotational Reynolds number varied from 3 × 10 5 to 5 × 10 5 based on rotational speed. Pressure was measured at various locations in the shroud, endwall, and rim seal. CO 2 concentration was measured at various rim seal locations to analyze sealing effectiveness. Measured results showed that 1.35% coolant mass flow rate of rim seal exhibited a little ingress effect, whereas lower coolant mass flow rates exhibited higher ingress effect. A predicted correlation for sealing effectiveness of rim seal was derived at various rotational Reynolds number and coolant mass flow rate. The correlation will be useful for turbine cooling design, helping to predict sealing effectiveness of rim seals during preliminary design processes for new gas turbines.

Keywords: gas turbine; blade; rim seal; sealing effectiveness (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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