Heat/mass transfer over the plane tip equipped with a full coverage winglet in a turbine cascade: Part 1 – Winglet bottom surface data

Heat/mass transfer over the plane tip equipped with a full coverage winglet in a turbine cascade: Part 2 – Tip surface data

“…By employing an overhang on only the early suction surface, significant efficiency improvement can be obtained without increasing the overall heat transfer. In the companion paper of this study (part 1), Kang and Lee [1] that with increasing h/s, heat/mass transfer rate averaged on the winglet bottom surface decreases consistently in almost linear proportion to h/s, and it is much lower than that averaged on the baseline blade tip surface with no winglet.…”

“…Details of the test rig are reported by Kang and Lee [1]. The turbine cascade has six large-scale blades of s/c = 1.47.…”

“…1. The FC winglet tested in this study is the same as that employed by Kang and Lee [1]. Each FC winglet is flush mounted to the tip surface as shown in Fig.…”

“…3 shows the naphthalene coated tip surface. The present instrumentation system is the same as that used by Kang and Lee [1]. The depth gauge used for the measurement of sublimation depth is an AC-AC ultra-precision LVDT (linear variable differential transformer) (Sensortec, Model S5-AY112HK).…”

“…Previous studies on turbine tip heat transfer for a plane (flat) tip, a cavity squealer tip, and various partial squealer tips were reviewed in detail by Kang and Lee [1]. Aerodynamic investigations for turbine blade tips equipped with various kinds of winglets were carried out by Patel [2], Booth et al [3], Dey and Camci [4], Harvey and Ramsden [5], Harvey et al [6,7], Schabowski and Hodson [8], Schabowski et al [9], Lee et al [10], Zhou et al [11], Lee et al [12], Schabowski and Hodson [13] and Schabowski et al [14].…”