TY - JOUR
T1 - Local heat and mass transfer in a rotor-stator system with hub inflow
T2 - Thermal boundary layer and superposition effect
AU - Choi, Seungyeong
AU - Choi, Paul
AU - Sohn, Ho Seong
AU - Rhee, Dong Ho
AU - Cho, Hyung Hee
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/5
Y1 - 2023/5
N2 - Improving the cooling performance of a gas turbine rotor-stator system can have a significant impact on the efficiency of a gas turbine engine. In this study, we investigated the local heat and mass transfer (HMT) of a rotor-stator system with hub inflow considering the thermal boundary layer and superposition effect. A rotor-stator system test facility capable of analyzing HMT characteristics was constructed. Measurements of local HMT coefficients were carried out using the naphthalene sublimation method. First, the development of local HMT was investigated using discontinuous boundary condition experiments. Quantitative evaluation of the high HMT in the windward area revealed the thermal entrance regions. Then, to assess individual and combined effects, the local HMT characteristics were analyzed under three conditions: hub inflow-only, rotating-only, and a combination of hub inflow and rotating flows. Hub inflow dominated in regions below local rotational Reynolds number (Rer) of 1.25 × 105, and the enhancement region appeared above Rer of 2.0 × 105. Our study described for the first time the boundaries of HMT in a rotor-stator system based on the dominant influence of superposed flow. We expect our results to aid the development of cooling designs for rotor-stator systems in gas turbine engines.
AB - Improving the cooling performance of a gas turbine rotor-stator system can have a significant impact on the efficiency of a gas turbine engine. In this study, we investigated the local heat and mass transfer (HMT) of a rotor-stator system with hub inflow considering the thermal boundary layer and superposition effect. A rotor-stator system test facility capable of analyzing HMT characteristics was constructed. Measurements of local HMT coefficients were carried out using the naphthalene sublimation method. First, the development of local HMT was investigated using discontinuous boundary condition experiments. Quantitative evaluation of the high HMT in the windward area revealed the thermal entrance regions. Then, to assess individual and combined effects, the local HMT characteristics were analyzed under three conditions: hub inflow-only, rotating-only, and a combination of hub inflow and rotating flows. Hub inflow dominated in regions below local rotational Reynolds number (Rer) of 1.25 × 105, and the enhancement region appeared above Rer of 2.0 × 105. Our study described for the first time the boundaries of HMT in a rotor-stator system based on the dominant influence of superposed flow. We expect our results to aid the development of cooling designs for rotor-stator systems in gas turbine engines.
KW - Gas turbine
KW - Heat and mass transfer
KW - Naphthalene sublimation method
KW - Rotor-stator system
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U2 - 10.1016/j.icheatmasstransfer.2023.106799
DO - 10.1016/j.icheatmasstransfer.2023.106799
M3 - Article
AN - SCOPUS:85152946624
SN - 0735-1933
VL - 144
JO - International Communications in Heat and Mass Transfer
JF - International Communications in Heat and Mass Transfer
M1 - 106799
ER -