Tip gap height effects on flow structure and heat/mass transfer over plane tip of a high-turning turbine rotor blade

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

“…In the case of h/s = 1.36%, contours of Sh TS on the baseline plane tip surface with no winglet measured by Lee et al [26] in Fig. 7 are compared directly with the present result in the same area shown in Fig.…”

“…9, as a function of h/s. Sherwood number averaged on the winglet bottom surface [1], Sh WBS , and Sherwood number averaged on the baseline plane tip surface with no winglet [26], Sh NOW , are also plotted in Fig. 9 for comparison.…”

Tip leakage aerodynamics over the cavity squealer tip equipped with full coverage winglets in a turbine cascade

“…The leading-edge flow separation/reattachment forms a pair of pressure-side and suction-side tip gap vortices (Fig. 6) due to the leading-edge curvature (Lee et al, 2009). The presence of the wide dark area bounded by the two dashed lines on the casing wall in Fig.…”

“…A lot of previous researches such as Bindon (1989), Yamamoto (1989), Azad et al (2000a), Bunker et al (2000), and Lee et al (2009) investigated tip leakage aerodynamics and/or heat transfer over the plane tips. Bindon (1989) measured the detailed development of tip clearance loss from the leading to trailing edge and identified the contributions made by mixing, internal gap shear flow, and endwall/secondary flow.…”

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

“…Rhee and Cho [5,6] reported heat/mass transfer distributions on the near-tip surfaces and shroud for a plane tip in a rotating low-speed annular turbine facility for h/c = 2.5%. Lee et al [7] investigated tip gap height effects on the flow structure and heat/-mass transfer over the tip surface of a turbine blade for power generation. Zhang et al [8] investigated transonic turbine blade tip heat transfer with different tip gaps.…”