Aerodynamics of smart flap under ground effect

Djavareshkian, Mohammad Hassan; Esmaeli, Ali; Parsani, A.

doi:10.1016/j.ast.2011.01.005

Cited by 32 publications

(25 citation statements)

References 32 publications

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“…The steady assumption is based on the other works, in this range of AOA, considering the problem steady state. 4,5,7,8,10,12,16 QUICK scheme has been adopted for discretizing momentum equations, second-order scheme for pressure interpolation, and second-order upwind for turbulent viscosity. SIMPLE algorithm has been utilized for the pressure–velocity coupling.…”

Section: Numerical Methods and Validationmentioning

confidence: 99%

Aerodynamic and static stability characteristics of airfoils in extreme ground effect

Nirooei

2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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The purpose of this paper is to analyze the aerodynamic and stability characteristics of airfoils in extreme ground effect, where gradients of variables are intense. Camber line of NACA4412 is modified to become S-shaped, named M4412, which turns the passage shape between the ground and the lower surface of NACA4412 from convergent to convergent–divergent. Reynolds-averaged Navier–Stokes equations with Spalart–Allmaras turbulence model have been solved by applying the finite volume approach. Lift of M4412 is less than that of NACA4412. Divergent effect normally creates a negative lift zone. Reducing the height when angle of attack is lower than a specific angle strengthens the divergent effect; however, above this angle, weakens it. A stable airfoil has a negative moment coefficient derivative with the angle of attack and a negative lift coefficient derivative with height, where both airfoils satisfy them also, the height center should be upstream from the pitch center (height stability). NACA4412 is quite height unstable, whereas the neutral curve, where the pitch and the height centers are co-located, divides the height stability plane (height vs. AOA) of M4412 into the unstable and stable regions. While reducing the height influences the height stability of NACA4412 adversely, it affects that of M4412 favorably. Raising the angle of attack varies the height stability level of the both airfoils negatively.

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Section: Numerical Methods and Validationmentioning

confidence: 99%

Aerodynamic and static stability characteristics of airfoils in extreme ground effect

Nirooei

2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…The diameters of both straight and elbow pipes are 50 mm, the length of straight pipe is 400 mm, and the curved pitch and helix angle of elbow pipes is 100 mm, and 540°. Given that the flow field in the pipe is steady and isothermal, the fluid control equation and RNG k − turbulence model equations were used in the simulation process [4,11]. After setting the corresponding boundary conditions mentioned above to physical models, the trajectory and number of particulates in the inlet and outlet of the pipe are simulated to obtain the moving process of particulates in pipelines and to compare the collection efficiency by straight and elbow pipes.…”

Section: Simulation Analysis Of Particulates In Straight and Elbow Pipesmentioning

confidence: 99%

Study on diesel engine exhaust particle separation based on gas–solid two-phase flow theory

et al. 2020

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Particulate matter in diesel exhaust is one of the primary sources of environmental pollution. This paper mainly studies the purification treatment of particulate matter in exhaust gas. It also studies the stress conditions and moving process of particulates in straight and elbow pipes respectively and explores their capture efficiency on the basis of that the gassolid two-phase flow composed of particulates and gas is a basic fluid state. This paper mainly analyzes the influence of straight and elbow pipe on the moving process of particulates. It also discusses the impact of the structure parameters of the elbow on the exhaust pressure of inlet and outlet of pipes to provide basis for its designing. In addition, experiment is carried out to verify the capture efficiency of particulates by elbow pipes under different working conditions of diesel engines. The experiment results show that the capture efficiency is improved and separation of particulates is more effective.

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“…In transportation research, aerodynamic forces and moments analysis (essentially the drag component) are of major interest in several applications, including aircraft aerodynamics (Djavareshkian et al, 2011;Rozhdestvensky and Ryzhov, 2003;Viswanath, 2002), ferrohydrodynamics (Baker, 2010;Raghunathan et al, 2002), marine engineering (Day and Cooper, 2011), and particularly in automotive industries (Watkins and Vino, 2008;Cheng et al, 2011;Abdul Ghani et al, 2001). The aerodynamic torsor of a vehicle is among the most important parameters in new car development.…”

Section: Introductionmentioning

confidence: 99%

Some innovative concepts for car drag reduction: A parametric analysis of aerodynamic forces on a simplified body

Khaled

Hage

Harambat

et al. 2012

Journal of Wind Engineering and Industrial Aerodynamics

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Aerodynamics of smart flap under ground effect

Cited by 32 publications

References 32 publications

Aerodynamic and static stability characteristics of airfoils in extreme ground effect

Aerodynamic and static stability characteristics of airfoils in extreme ground effect

Study on diesel engine exhaust particle separation based on gas–solid two-phase flow theory

Some innovative concepts for car drag reduction: A parametric analysis of aerodynamic forces on a simplified body

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