Numerical study of the effect of suction at a compressible and high Reynolds number flow to control the flow separation over Naca 2415 airfoil

Fatahian, Esmaeel; Nichkoohi, Ali Lohrasbi; Fatahian, Hossein

doi:10.1504/pcfd.2019.099598

Cited by 16 publications

(18 citation statements)

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“…The Reynolds number was considered from 6300 to 12,640 for different coil diameters at a water inlet velocity of 0.5 m/s so the flow was assumed to be turbulent. The numerical analysis was carried out using ANSYS Fluent 18.2 based on the CFD codes which are used to describe the complex behaviors of the heat and mass transfer [24][25][26] and also are implemented in various problems [27][28][29]. The upwind second-order method was applied for the discretization of continuity, momentum, and energy equations.…”

Section: Grid Generation and Numerical Methodsmentioning

confidence: 99%

A parametric study of the heat exchanger copper coils used in an indirect evaporative cooling system

2019

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Due to the lower energy consumption in the evaporative cooling, it is the subject of numerous studies. Evaporative cooling considers a green cooling system which does not require any chemical reaction and does not depend on the hazardous material. The present study mainly focused on parametric analysis of an indirect evaporative cooling system using the computational fluid dynamics method. The numerical simulation of an indirect evaporative cooling system was carried out using ANSYS Fluent 18.2. The effects of the water inlet velocity, air inlet velocity, coil diameters (d c ) and the number of the heat exchanger copper coils were numerically investigated. The flow was considered as threedimensional, turbulent, and incompressible. The results indicated that the increment of the coil diameter and water inlet velocity had a positive effect on the performance of the indirect evaporative cooling system. The maximum water outlet temperature was obtained at 285.05 K for the water inlet velocity of 0.5 m/s. Moreover, the saturation efficiency is decreased by increasing air inlet velocity. On the other hand, saturation efficiency was increased at all air inlet velocities by increasing the coil diameter.

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Section: Grid Generation and Numerical Methodsmentioning

confidence: 99%

A parametric study of the heat exchanger copper coils used in an indirect evaporative cooling system

2019

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“…The compressible Navier-Stokes equations are selected as governing equations of the flow field. These governing equations can be expressed as follows for steady and twodimensional flow [13]:…”

Section: Governing Equations and Numerical Methodsmentioning

confidence: 99%

“…All present simulations are carried out with the densitybased finite volume solver of the commercial software ANSYS Fluent 16 due to the fluid compressibility assumption. In addition, SIMPLE coupled algorithm [13,18,19] is adopted for pressure-velocity coupling and upwind second order method is used for discretizing the governing equations.…”

Section: Governing Equations and Numerical Methodsmentioning

confidence: 99%

CFD analysis of the aerodynamic characteristics of biconvex airfoil at compressible and high Mach numbers flow

Hosseini

2019

SN Appl. Sci.

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In the present study, numerical investigation of the turbulent flow over a biconvex airfoil at compressible and high Mach numbers flow is done using computational fluid dynamics (CFD). The flow is considered as turbulent, two-dimensional, steady and compressible. For this purpose, three Reynolds number of 2.4 × 10 7 , 2.9 × 10 7 and 3.3 × 10 7 are considered. The simulations are implemented using the commercial software Ansys Fluent 16. The results are obtained with Reynoldsaveraged Navier-Stokes (RANS), and for simulating the flow turbulence, SST k-ω turbulence model is carried out. The results show that the lift coefficient (C L) and drag coefficient (C D) increase by the increment of the angle of attack (α). The lift-to-drag ratio (C L /C D) is improved by increasing the Mach number (Ma) and cause to delay the boundary layer separation. Increasing the Mach number affects the stall angle which causes to increase it from α = 22° to α = 30° from Ma = 1 to Ma = 1.4.

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“…Passive control devices are those which are not energy consumptive such as trailing-edge flaps [14][15][16] and leadingedge slats [17,18]. In contrast, active control devices are energy consumptives such as a small energy input by suction and blowing jets [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effects of the hinge position and suction on flow separation and aerodynamic performance of the NACA 0012 airfoil

Fatahian

Nichkoohi

Salarian

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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In the present study, the effect of hinge position (H) has been numerically investigated to find the appropriate position for improving the aerodynamic performance of the NACA 0012 flapped airfoil. In addition, perpendicular and tangential suctions have been applied to control the flow separation and enhance the aerodynamic performance over the NACA 0012 flapped airfoil at each different hinge positions. The simulations were carried out at a Reynolds number of 5 × 10 5 (Ma = 0.021) based on two-dimensional incompressible unsteady Reynolds-averaged Navier-Stokes calculations to determine the adequate hinge position. The turbulence was modeled using the shear stress transport k-ω turbulence model. The effect of perpendicular suction (θ jet = − 90°) and tangential suction (θ jet = − 30°) was computationally studied over NACA 0012 flapped airfoil for five different hinge positions (H = 0.7c, 0.75c, 0.8c, 0.85c and 0.9c) and a flap deflection (δ f) of 15°. Based on the results, the hinge position significantly affects the aerodynamic performance of the airfoil. The lift coefficient increased clearly as the hinge position moved to the trailing edge of the airfoil. Using perpendicular suction caused to increase the lift coefficient and decrease the drag coefficient. Consequently, the maximum value of the lift-to-drag ratio (C L /C D) for perpendicular and tangential suctions was achieved about 35.8% and 25.1% higher than that of the case without suction at an angle of attack of 12° and H = 0.9c. Also, the effect of perpendicular suction was more considerable compared to the tangential suction. This caused a reduction in the size of the recirculation zone from 0.5 to 0.09 of the airfoil chord length and also transferred it from 1.13 to 1.18 of the airfoil chord length.

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Numerical study of the effect of suction at a compressible and high Reynolds number flow to control the flow separation over Naca 2415 airfoil

Cited by 16 publications

References 0 publications

A parametric study of the heat exchanger copper coils used in an indirect evaporative cooling system

A parametric study of the heat exchanger copper coils used in an indirect evaporative cooling system

CFD analysis of the aerodynamic characteristics of biconvex airfoil at compressible and high Mach numbers flow

Effects of the hinge position and suction on flow separation and aerodynamic performance of the NACA 0012 airfoil

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