نتایج جستجو برای: naca
تعداد نتایج: 757 فیلتر نتایج به سال:
Pada kelas Airframe, Piston Engine, Gas Turbine Engine. materi pembelajaran ditemukan beberapa permasalahan dalam pemahaman tentang performa aerodinamika penerbangan, yaitu Koefisien Lift dan Drag pada sayap menggunakan winglet. Winglet dapat memberikan peningkatan dengan moderate cost tanpa violating discated spam limit pengembangan metode untuk desain analisi winglet telah menjadi focus dari ...
in this paper, lift and drag coefficients were numerically investigated using numeca software in a set of 4-digit naca airfoils. two metamodels based on the evolved group method of data handling (gmdh) type neural networks were then obtained for modeling both lift coefficient (cl) and drag coefficient (cd) with respect to the geometrical design parameters. after using such obtained polynomial n...
The equations for the NACA 4-digit and 4-digitmodified sections are in algebraic form and easily incorporated into various geometrical procedures that define a vehicle and any necessary flow field grid. The 6-series and 6A-series airfoils are more complex because they are developed by conformal mapping procedures. Even though there are computer programs available (refs 1-3) that can produce a l...
The present study investigates the impact of rotor solidity and blade profile on self-starting characteristics performance H-Darrieus wind rotors (H-rotors) through subsonic tunnel experiments. Three symmetrical (NACA 0018) three unsymmetrical (NREL S823) H-rotors were analyzed to determine coefficient static torque (Cts) power (Cp) across solidities (σ = 0.25, 0.3, 0.35) two free stream speeds...
A full Navier-Stokes solver has been used t o model transonic flow over three airfoil sections. The method uses a two-dimensional, implicit, conservative finite difference scheme for solving the compressible Navier-Stokes equations. Results are presented as prescribed for the Viscous Transonic Airfoil Workshop to held at the AIAA 25th Aerospace Sciences Meeting. "Jones" airfoils have been inves...
The objective of this paper is to study the effect of an unsteady moving heat source on the aerodynamic performance of an NACA 0012 airfoil section, with particular focus on the lift and drag coefficients. The compressible Navier–Stokes equations are solved using a finite volume method as well as Spalart-Allmaras Model for turbulence simulation. The heat source periodically moves over the lower...
Abstract―This paper illustrates the theory behind computational fluid dynamics (CFD) of flow though a gas turbine engine low pressure compressor. The goal of study is to develop a tool to perform shape optimization of low speed airfoils. Mathematical model and computational tool are developed using programming software. Analytical solution is developed to create airfoil geometry. The NACA 4 dig...
The formation of the tip-vortex from a rectangular NACA 2415 wing-tip at a chord Reynolds number of 10000 has been simulated. The simulations employ a parallelized compressible large-eddy simulation (LES) solver that has been developed to simulate wing and rotor tip-flows. The solver employs an immersed-boundary technique in conjunction with a curvilinear structured grid and the dynamic model i...
A novel spectral-element approach for the eikonal equation is presented based on the work of Tucker et al. This approach is readily implemented in standard finiteelement flow solvers developed for the Navier-Stokes equations. Results are presented for distance function (level set) for three planar configurations: circular cylinder, NACA 0012 airfoil, and T106 airfoil. Results demonstrate that t...
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