.... Heat transfer was simulated by solving the passive scalar transport equation with Prandtl number Pr = 0.7. The roughness topographies under investigation here are based on an X-ray computed tomography scan of an additively manufactured internal cooling passage, which had an irregular, multiscale...

... into the lower section of the annulus led to a relatively high heat flux, coupled with a blockage effect on the natural draft in the upper section of the annulus inhibiting the convective heat transfer from this section. There appears to be a relationship between the porosity of the annulus and the peak top...

...Samuel Altland; Xiang I. A. Yang; Karen A. Thole; Robert Kunz; Stephen McClain Design for cooling effectiveness in turbine blades relies on accurate models for dynamic losses and heat transfer of internal cooling passages. Metal additive manufacturing (AM) has expanded the design space...

... and convective heat transfer. Using the definition in Fig. 3 , a standard triangle language (STL) was generated from the design intent computer-aided design (CAD) file for each desired surface inside a single cooling channel. Using an in-house code, a normal vector (facing away from the solid AM part...

... distributions are the same in the three cases, the effective slope (ES) is very different, and the impact of this parameter on turbulence and heat transfer is analyzed at different Reynolds numbers. Table 6 Roughness function values evolution Re Re Re Re Δ U + 5000 8000 17,000...

... DR = density ratio, ρ c / ρ ∞ Re = Reynolds number (Re* = δ · u τ / ν ∞ ) Tu = freestream turbulence intensity, u rms / U ∞ heat transfer shaped hole adiabatic effectiveness and film cooling References [1] Bunker , R. S. , 2005...

... for publication in the J ournal of T urbomachinery . 15 07 2021 07 09 2021 08 09 2021 27 05 2022 heat transfer effusion cooling combustion fluid dynamics and heat transfer phenomena in compressor and turbine components of gas turbine engines heat transfer and film cooling...

... presents Reynolds-averaged Navier–Stokes (RANS) conjugate heat transfer simulations that identify trends in cooling design performance as well as experimental measurements of overall effectiveness using a flat-plate matched-Biot number model with a simulated TBC layer of 0.42D thickness, where D...

... with a significant heat sink effect by forced convection within the holes. Therefore, high performances of the cooling system are achieved and a lower consumption of coolant air compared with other cooling technologies occurs. computational fluid dynamics (CFD) fluid dynamics and heat transfer phenomena...

...Lorenzo Mazzei; Riccardo Da Soghe; Cosimo Bianchini It is well known from the literature that surface roughness significantly affects friction and heat transfer. This is even more evident for additive manufactured (AM) components, which are taking an increasingly important role in the gas turbine...

...Ce Liang; Yu Rao; Jianian Chen; Peng Zhang Experiments and numerical simulations under stationary and rotating conditions have been conducted to investigate turbulent flow and heat transfer characteristics of innovative guiding pin fin arrays in a wedge-shaped channel, which models the internal...

... experimental data, the numerical accuracy of VLES method was validated. With the VLES method, the unsteady heat transfer coefficient distributions on the squealer tip and total pressure loss in the blade passage were computed. The influences of coherent vortex structures on aero-thermal performance...

... system level. First-of-its-kind experimental results of spatially resolved tip heat transfer coefficient distribution at high relative casing Mach number are reported. The disk rotor rig design demonstrated in this paper can also be useful for other tip leakage flow studies. Figure 11 presents...

... and unique surface roughness. Previous work in scaled passages analyzed pressure losses and friction factors associated with the rough surfaces, as well as investigated the velocity profiles and turbulent flow characteristics within the passage. In this study, the heat transfer characteristics of scaled...

...@hit.edu.cn 1 Corresponding author. Email: leiluo@hit.edu.cn Email: hitdw9211@outlook.com Email: Wang_stao@126.com Contributed by the Heat Transfer Division of ASME for publication in the J ournal of T urbomachinery . 01 03 2021 25 09 2021 27 09 2021 05 11 2021...

..., contributing to thickening of tip boundary layer and the plummet of skin friction on tip surface, which is responsible for the sharp decline of tip Nusselt number and therefore, formation of low heat transfer stripe downstream cooling injection. Email: haiteng.ma@sjtu.edu.cn Email: 020020910172...

... , “ On the Distribution of Intermittency in the Transition Region of a Boundary Layer ,” J. Aero. Sci. , 24 ( 9 ), pp. 711 – 712 . [6] Albiez , H. , Gramespacher , C. , Stripf , M. , and Bauer , H.-J. , 2020 , “ High Resolution Measurements of Heat Transfer, Near-Wall Intermittency, and Reynolds...

...Daniel D. Fahy; Peter Ireland As a civil gas turbine cools down, asymmetric natural convective heat transfer causes the bottom sector of the rotor to cool faster than the top; this circumferential thermal gradient can potentially cause the shaft to deflect – a phenomenon called thermal or “rotor...

... the aerodynamic flow topology and the effect of various cooling injection schemes on the heat transfer patterns. This manuscript presents the results of an extensive numerical effort, optimizing the aerothermal performance of both uncooled and cooled turbine tip designs, adopting fully arbitrary squealer rim...

... . 10.1115/1.2927991 [4] Farthing , P. , Long , C. , Owen , J. , and Pincombe , J. , 1992 , “ Rotating Cavity With Axial Throughflow of Cooling Air: Heat Transfer ,” ASME J. Turbomach. , 114 ( 1 ), pp. 229 – 236 . 10.1115/1.2927990 [5] Bohn , D. E. , Deutsch , G. N...