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Showing 1 to 20 of 139 for “"NACA"”.
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Missed opportunities: NACA and jet propulsion
This study examines NACA's organization in the light of Alfred D. Chandler's <i>Strategy and Structure</i>. It analyzes the agency's administration. NACA's strategy of maximizing existing technology and its committee's structure were the key elements in its failure to develop jet propulsion in the …
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Dynamic stall of a NACA 0012 airfoil in laminar flow
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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An experimental low Reynolds number comparison of a Wortmann FX67-K170 airfoil, a NACA 0012 airfoil, and a NACA 64-210 airfoil in simulated heavy rain
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1987
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Experimental Investigation of Transonic Shock Oscillations on NACA 0018 at Incidence
A NACA 0018 airfoil model with a 3-inch chord was mounted into the trisonic wind tunnel at the National Center for Physical Acoustics at the University of Mississippi. Tunnel runs were conducted with the angle of incidence increasing from 0 degrees to 6 degrees at 1 degree increments, while the …
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An Investigative Study of Gurney Flaps on a NACA 0036 Airfoil
… the effect of Gurney flaps on a 2D, 2-ft chord NACA 0036 airfoil in the Cal Poly 3’x4’ low speed wind tunnel at 25 m/s. It also covered the numerical simulation of the experiment in computational fluid dynamics (CFD). During the study, problems with the wind tunnel data were seen. After a …
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Post-stall hysteresis and flow field unsteadiness on an NACA 0012 airfoil
… associated with static stall hysteresis on an NACA 0012 airfoil at Rec = 1.0 × 10^6. Unsteady pressure measurements were acquired to evaluate the performance of the airfoil, and a hysteresis loop was identified in the vicinity of the airfoil Cl,max. Two fundamentally different flow regimes were …
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Reynolds number effects on the unsteady aerodynamic behavior of an NACA 0012 airfoil
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1986
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Computational Analysis of Turbulent Flow Around NACA 4412 Airfoil with Open Source CFD Software
… will be used to simulate the flow around a NACA 4412 airfoil. The NACA 4412 airfoil was chosen because it is a flow of interest that when ran at its critical angle of attack a separation bubble forms at the trailing edge of the airfoil. This separation bubble is a common occurrence in …
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Aerodynamic Performance Enhancement of a NACA 66–206 Airfoil Using Supersonic Channel Airfoil Design
… The effect of applying these techniques to a NACA 66-206 airfoil is presented. The design domain entails channel heights of 8-16.6% thickness-to-chord and speeds from Mach 1.5-3.0. Numerical simulations show an increase in the lift-to-drag ratio for airfoils at Mach 2.5 at a 35,000-ft altitude …
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Convection from ice roughness surfaces using scaled Reynolds numbers for larger NACA 0012 airfoils.
… flow similar to that experienced by a 21-in. NACA 0012 airfoil. The current study characterizes the convective heat transfer using the same roughness surfaces but exposed to flow scaled to that of a larger NACA 0012 airfoil by increasing wind tunnel velocity and thus scaling the Reynolds …
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Role of glutamate in lead-induced toxicity: protection by N-acetylcysteine amide (NACA), a novel thiol antioxidant
"Despite several efforts to reduce lead levels in the environment, lead exposure continues to be a major public health problem, in the US today. Toxic effect of lead are mainly manifested in central nervous system (CNS) because brain acts as a reservoir for lead deposition. Lead-induced cell damage …
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Mean Loading and Turbulence Scale Effects on the Surface Pressure Fluctuations Occurring on a NACA 0015 Airfoil Immersed in Grid Generated Turbulence
… pressure measurements have been made on a NACA 0015 immersed in two grid generated homogenous flows at Re = 1.17 x 10⁶ for a = 0°, 4°, 8°, 12°, 16°, and 20°. The goal of this measurement was to reveal and highlight mean loading and turbulence scale effects on surface pressure fluctuations …
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The maculoprotective effect of a thiol antioxidant in retinal degeneration models
… we hypothesized that N-acetylcysteine amide (NACA), a thiol antioxidant, would protect retinal pigment epithelium and impede the progression of retinal degeneration. The goal of this work was to evaluate the efficacy of NACA in preventing retinal pigment epithelial cell and photoreceptor death …
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Oxidative stress mechanisms within the developing porcine oocyte and the effects of antioxidant supplementation
… (NAC), and N-acetyl-cysteine-amide (NACA) supplemented to the maturation medium on intracellular GSH concentrations, nuclear maturation, fertilization success and embryo development. Antioxidants GSH, NAC and NACA (1.0 mM) were supplemented to the media during oocyte maturation. …
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A study of the beneficial role of thiol antioxidant supplementation in various forms of glutathione deficiency
… of a thiol antioxidant, N-Acetylcysteine amide (NACA), to protect cells from the harmful effects of glutathione depletion in two different models of oxidative stress. The first model represented oxidative stress processes in age-related macular degeneration. This part of the study focused on the …
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Rotor eólico Darrieus: um estudo experimental
… rotor with straight an.d troposkien blades using NACA 0012 and NACA 0015 profiles was realized. A reduzed scale model (height = diameter = 500 mm) with "Prony" brake dynamometer was tested in a wind tunnel with a 1 m2 test section and maximum wind velocity of 8,0 m/s. The experimental results were …
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Validation and Verification of the Wray-Agarwal Turbulence and Algebraic Transition Models for 2D External Airfoil Flows
… turbulence models. Flow past several symmetric NACA airfoils, namely NACA 0012, NACA 0015 and NACA 0018 are standard test cases for validating and evaluating turbulence models’ accuracy since the experimental data is available for these airfoils. Available wind tunnel data allows for testing …
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Aerodynamics of Runback Ice Accretions
… performance penalties. In general, the NACA 23012 experienced greater aerodynamic performance penalties due to the runback simulations than did the NACA 3415. Low-fidelity simulations of the cold hold case agreed quite well with their medium fidelity counterparts. In the descent case, …
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Das Risiko von Verletzungen und Überlastungsschäden beim Eisklettern
… quantified and injuries rated according to the NACA score. To enable comparison to other sports, injury risk was calculated per 1000 hours of participation in a given sport. The 88 ice climbers recorded 23361 ice climbing hours over a three-year period. Our calculations from this data found 4.1 …
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Effects of Supercooled Large -Droplet Icing on Airfoil Aerodynamics
… on the NLF 0414 were quite different from the NACA 23012m. There was little variation of lift when the simulated ice-shape location was varied from 2% to 20% chord. The large losses in lift occurred when the ice shape was located downstream of 30% chord, and the separation bubble formed over …
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