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Showing 1 to 20 of 76 for “"wind tunnel tests"”.
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Design of 3D swept wing hybrid models for icing wind tunnel tests
… during icing conditions through a set of flight tests, consistent with the standards set forth by the Federal Aviation Administration. This is often expensive and challenging to find the appropriate icing test conditions. Thus, both computational methods and icing wind tunnel experiments are …
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Use of hybrid airfoil design in icing wind tunnel tests of large scale swept wings
… commercial aircraft relative to existing icing wind tunnels and lack of robust scaling methods also makes ice accretion wind tunnel testing difficult. Hybrid or truncated airfoil models use full-scale leading edges with redesigned aft sections to provide test articles with much reduced model …
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Design and testing of a concentrator wind turbine
Wind energy, being an indirect form of solar energy would initially seem a very promising form of energy. Unfortunately, it suffers from the problem of dilution. Wind turbine designers naturally try to compensate for this by increasing the size of the rotor to capture more of the kinetic energy of …
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An experimental investigation of the use of air jet vortex generators to control shock induced boundary layer separation
… vane type generators. Recent low speed wind tunnel tests carried out at City University indicated that the strength of the vortex could be increased considerably by using rectangular jet exits rather than round ones as used by Wallis. On this basis an investigation into air jet vortex …
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Analysis of fountain effect for tiltrotor configuration using computational fluid simulation and experimental method
… model in both hover flight condition and crosswind condition replicated in the wind tunnel. To record data, a subsonic wind tunnel was utilized to test the wing/rotor configuration in different conditions of freestream velocity of V_∞=10, 15, and 20 m/s, the blade pitch angle of θ=5°, 10°, and …
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Estimation of cavity pressures in air-permeable, multi-layer systems using a lumped-leakage approach
… conventional buildings, the proper estimation of wind-induced pressures on the external façade, the roof surface, or the net pressures across elements like a canopy or parapet, which are exposed to wind on both sides, can be easily done using conventional wind tunnel tests. But in the case of …
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A study of the wind environment in a city center
The nature and effects of windy conditions in a city are first discussed, recording meteorological data are introduced, and existing criteria for the acceptability of a wind environment with regard to pedestrian comfort are described. General features of wind-tunnel techniques are reviewed. A study …
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Modeling and validation of a subscale aerobatic aircraft configuration in spin
… wing, and validation of that model through wind tunnel tests. Significantly, these results are combined to form a new code, SpinSim, which assists with the six-degree-of-freedom (6DOF) simulation of the aerodynamics and flight dynamics of an aircraft. This code places particular emphasis on …
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Computational wind engineering using finite element package ADINA
… tall and long span structures is governed by the wind forces. Inadequate research in the field of wind dynamics has forced engineers to rely on design codes or wind tunnel tests for sufficient data. The present work uses a computational wind dynamics method to compare the coefficient of pressure …
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Evaluation of propulsor aerodynamic performance for powered aircraft wind tunnel experiments
… mechanical ow power for a 1:11-scale, powered wind tunnel model of an advanced civil aircraft utilizing boundary layer ingestion (BLI); mechanical ow power is a surrogate for aircraft fuel burn. Back-to-back experiments of BLI and non-BLI aircraft configurations to assess the BLI benet directly …
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An analysis of curved flow wind tunnel testing
… of the flows involved in the curved flow wind tunnel and in curved flight. Equations for the forces and moments for each of these flows are presented and then used to develop equations for the corrections to the forces and moments obtained in curved flow wind tunnel tests. An example of …
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Optimized Engine Out Procedures to Extend the Range of Jet Transport Airplanes
… of the airplane can be improved significantly. Wind tunnel tests of both a Boeing 747 and a 767 model were performed to determine experimentally the increase in range that can be achieved by the zero slip position. By comparing the drag force coefficient obtained at the sideslip position that …
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Development of the Pressure-Sensitive-Paint Technique for Advanced Turbomachinery Applications
… technique is now commonly used in stationary wind-tunnel tests; this thesis presents the extension of the technique to advanced turbomachinery applications. New pressure- and temperature-sensitive paints (TSPs) have been developed for application to a state-of-the-art transonic compressor …
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Characterizing the performance of footballs
… kicked. Currently, testing of footballs includes wind tunnel tests and expensive and bulky camera systems. Plausibility is established by proving that translational velocity can be measured with light, portable setups. This was accomplished by using commercial grade cameras in conjunction with …
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An experimental investigation of oblique wing static aeroelastic phenomena
A series of wind tunnel tests were conducted to determine the aerodynamic forces and moments produced by several clamped oblique wings. The wing sweep and aileron deflection angles were varied throughout a wide range of dynamic pressures. The wing structure was also stiffened. Strains were measured …
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Investigation of Data Quality for Wind Tunnel Internal Balance Testing
… quality, consistency, and testing efficiency in wind tunnel tests using internal balances is accomplished through the use of new testing methods, analysis of data output, and standardized documentation of test procedures at the Texas A&M Low Speed Wind Tunnel. The wind tunnel is capable of …
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Supersonic flow field visualization studies of the MÅ = 6 price waverider planform
Supersonic tests of the conical flow derived MÅ Ê» = 6 (design) Price waverider planform were conducted using the Naval Postgraduate School wind tunnel. These tests are part of a continuing effort to study the characteristics of waverider configured vehicles. Two sting-mounted, flat-plate …
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The effects of forebody strakes on asymmetric vortices on a vertically launched missile
Wind tunnel tests were conducted on a vertically launched surface-to- air missile model to investigate the effects of forebody stakes on the side forces and yawing moments induced by nose-generated asymmetric vortices at high angles of attack. The effects of body configuration and a turbulent …
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Optimization of a Vortex Generator Configuration for a 1/4-Scale Piper Cherokee Wing
<p>Several sets of wind tunnel tests were performed to determine an optimum vortex generator configuration for a 1/4-scale model of the Piper Cherokee wing. Several variables were incorporated into this experiment in an effort to determine their influence on vortex generator performance enhancement …
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The role of the aerodynamic modifications of the shapes of tall buildings
… it is more susceptible to vibration caused by wind because of its asymmetric distribution of mass and stiffness, increased flexibility and insufficient inherent damping. This wind-induced motion, in particular crosswind response, endangers the dynamic response of tall structures, the …
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