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Showing 1 to 20 of 267 for “"subsonic"”.
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Application of panel methods for subsonic aerodynamics
Several panel methods are developed to model subsonic aerodynamics. The vorticity panel method for two-dimensional problems is capable of handling general unsteady, potential, lifting flows. The lifting surface is modelled with a vortex sheet and the wakes by discrete vortices. As an imitation of …
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Large eddy simulation of subsonic mixing layers
… to study the large-scale structures in a low subsonic mixing layer and their breakdown to small scales. For 3-D simulations, different finite-difference and pseudo-spectral schemes are tested. The (2, 4) MacCormack Scheme developed by Gottlieb and Turkel (1976) shows the best overall …
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Flow analysis and control in a subsonic inlet
S-duct inlets are commonly used on subsonic cruise missiles, as they offer a good compromise between compactness, low observability and aerodynamic performance. Though currently used S-ducts exhibit good performance in terms of distortion and pressure recovery at the AIP, the situation can degrade …
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Heat transfer effects on a subsonic delta wing
With the advent of the "Space Shuttle" concept, it has become necessary to study the effects of heat transfer on the aerodynamic and boundary layer characteristics of a heated delta wing. Thus, a symmetrical 60° delta wing was tested up to twice freestream temperature in the Virginia Tech 6' x 6' …
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A numerical model of unsteady, subsonic aeroelastic behavior
A method for predicting unsteady, subsonic aeroelastic responses has been developed. The technique accounts for aerodynamic nonlinearities associated with angles of attack, vortex-dominated flow, static deformations, and unsteady behavior. The angle of attack is limited only by the occurrence of …
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Application of the Hydraulic Analogy to Internal Subsonic Flow
… of the hydraulic analogy when applied to subsonic internal flows such as exist in pure fluid elements. The study included a literature survey, an analytical investigation of the hydraulic analogy, and an experimental test program to measure the degree of correlation between an air and …
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Feasibility Study of an Axially-Stacked, Subsonic Propeller System
With the aerospace industry pushing for an increased production and application of unmanned aerial vehicles (UAVs), humans will increasingly become exposed to noise pollution emanating from above. Fortunately, electric motors have and will continue to gain an ever-prominent role in the power plant …
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Design, construction and evaluation of a subsonic wind tunnel.
Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. Thesis. 1970. M.S.
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Effect of an aeroelastic film on confined subsonic cavity resonance
EFFECT OF AN AEROELASTIC FILM ON CONFINED SUBSONIC CAVITY RESONANCE by Melissa Carter B.S., Mechanical Engineering, University of New Mexico, 2001 M.S., Mechanical Engineering, University of New Mexico, 2011 ABSTRACT Two shallow three-dimensional cavities were used to study the effect on cavity …
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Study of High-speed Subsonic Jets using Proper Orthogonal Decomposition
<p>The primary objective of this thesis is to advance Proper Orthogonal Decomposition (POD) methods to quantify similarities and differences between the turbulent structures in the mixing layer of transonic jets issued through baseline axisymmetric conical nozzle and ones with chevrons. The …
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Two-dimensional subsonic compressible flow about an arbitrary Joukowsky airfoil
… may be concluded that the method of calculating subsonic compressible flows proposed by Gelbart is valid and practical for arbitrary airfoil shapes for which a convenient mapping function exists, It was found that the method can be carried out with comparative ease as compared to numerical …
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IMPACT OF NEW CHEVRON CONFIGURATIONS ON MIXING ENHANCEMENT IN SUBSONIC JETS
… the takeoff environment of a contemporary subsonic aircraft. The fan nozzle total pressure is set to 1.8 atm while the core nozzle total pressure is 1.65 atm. The total temperature inside the fan nozzle is set to 333.3 K while the core nozzle has a total temperature of 833.3 K. The …
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A Numerical Study of Unsteady Two-Dimensional Subsonic Compressible Base Flow
In subsonic flow, the wake behind a two-dimensional body with a blunt trailing edge is dominated by a regular array of alternately shed vortices. This separated flow produces a low pressure on the base of the body, resulting in a drag component known as the base drag, which can constitute a major …
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Modeling flue pipes--subsonic flow, lattice Boltzmann, and parallel distributed computers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Performance optimization of a subsonic Diffuser-Collector subsystem using interchangeable geometries
A subsonic wind tunnel facility was designed and built to test and optimize various diffuser-collector box geometries at the one-twelfth scale. The facility was designed to run continuously at an inlet Mach number of 0.42 and an inlet hydraulic diameter Reynolds number of 340,000. Different …
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Investigation of subsonic boundary layer effects on supersonic-type airfoil sections
… that the testing of supersonic airfoils at subsonic speeds to obtain pressure distributions will result in considerable error if the models are tested at very low Reynolds Numbers. The thickness of the boundary layer is critical at low Reynolds Numbers and causes a decrease in the …
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Integrated aerodynamic-structural design of a subsonic, forward- swept transport wing
… the integrated design optimization of a subsonic, forward-swept transport wing. A modular sensitivity approach for calculating the cross-sensitivity derivatives is employed. These derivatives are then used to guide the optimization process. The optimization process employed is an …
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