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Combination of Active and Passive Techniques Applied on NACA0015 for Aerospace Applications Regarding Anti-Icing Issues
Abstract
NACA0015 with/without rectangular fin at different positions and lengths was numerically investigated in terms of antiicing performance. Circular and slot jets with different angles at a constant position (H/d=4) of piccolo tube was parametrically performed under turbulence flow condition. Piccolo tube position at Y-axis (-5≤L/d≤5) was changed. As a result, slot jet design (AR=4) with the angle of α=90º in NACA0015 inserted fin at Fpos/Dpic=4 & FL/Dpic=0.11 presented the maximum average Nusselt number according to the case of piccolo tube was positioned at L/d=0.
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In this study, the effect of impinging jet cooling on solar air heater with and without longitudinal fins has been numerically investigated. The absorber plate surface of the solar air heater is modeled as a constant heat flux condition. Numerical analyses have been conducted on turbulent flow conditions (10,000 ≤ Re ≤ 50,000). The jet flow velocity has been taken constant. The effect of fin height and mass flow rate of working fluid on the thermal efficiency of the solar air heater has been analyzed in detail. Variation of the convection heat transfer coefficient as a function of Reynolds number has also been determined for finned and unfinned conditions. Temperature and local Nusselt number distributions on the absorber plate have been defined as contour graphs. It is found that the Nusselt number and thermal efficiency enhance by adding impingement jets and increasing the Reynolds number. Also, it is obtained from numerical analyses that the convection heat transfer coefficient increases with increasing the fins height. Finally, it is revealed that using impinging jets and fins enhances the efficiency and convection heat transfer up to 23.35% and 15%, respectively.
This study focuses on an experimental and numerical heat transfer investigation of an impingement jet array with a concave target plate that resembles a turbine blade’s leading edge. The array consists of nine circular jets with a diameter of Djet and the target plate has a curvature radius of R = Djet . The target plate also features film cooling holes in a staggered configuration so that each jet is surrounded by three film cooling holes. A Reynolds number of 30, 000 is tested, while the separation distance H is altered between H/Djet = 2.7 and H/Djet = 4. In addition the jets are exposed to a crossflow (cf). The experimental heat transfer data are obtained by using the transient Thermochromic Liquid Crystal (TLC) method. In the Computational Fluid Dynamics (CFD) study 3D steady state
Reynolds-Averaged Navier-Stokes (RANS) simulations with the software package OpenFOAM and the kω −shear − stress − transport (SST) turbulence model are performed. The numerical results from OpenFOAM agree well with the experimental data and local flow phenomena are captured correctly. The crossflow decreases the
stagnation point heat transfer as well as the overall heat transfer but homogenizes the local heat transfer distribution. A smaller separation distance enhances the crossflow effects and generally increases the heat transfer level.
- H K Pazarlıoğlu
- A Ü Tepe
- K Arslan
H.K. Pazarlıoğlu, A.Ü. Tepe, K. Arslan.
European Journal of Science and Technology. 34
(2022)
19-27.
- Y Xing
- W Fan
- M Du
- F Zhong
Y. Xing, W. Fan, M. Du, F. Zhong.
J
Heat
Transfer.
144
(2022).
- H K Pazarlıoğlu
- A Ü Tepe
- M Tekir
- K Arslan
H.K. Pazarlıoğlu, A.Ü. Tepe, M. Tekir, K. Arslan.
Thermal Science and Engineering Progress. 36
(2022)
101483.