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Showing 1 to 20 of 32 for “"Subsonic Wind Tunnel"”.
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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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Development of a Force and Airspeed Data Acquisition System for the Embry-Riddle Aeronautical University 30x40 in. Subsonic Wind Tunnel
<p>The very first objective of performing most experiments is collecting numerical data. Values can be read from instruments or gauges by eye and recorded by hand. However, in certain experiments the amount of data collected may become so large that a human alone can not observe and record the data …
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Near-Stall Loss Measurements in a CD Compressor Cascade with Exploratory Leading Edge Flow Control
… using a five-hole conical pneumatic probe in a subsonic wind tunnel containing a modeled cascade of controlled diffusion (CD) stator blades. Following reference measurements at high incidence one blade was modified (slotted at the leading edge) in an attempt to (passively) reduce the size of the …
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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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Inlet model testing facility preparation, injector calibration and preliminary testing of two two-dimensional inlet models at high incidence angles to study internal flow separation
… its control system, and the Virginia Tech 6-foot subsonic wind tunnel. The geometry of the two inlet models is discussed and the inlet model instrumentation is described. The injector is calibrated in preparation for the inlet model tests and found to exhibit satisfactory performance. Inlet models …
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The effect of roughness element thermal conductivity on turbulent convection.
… were performed in the Baylor University Subsonic Wind Tunnel to investigate the effects of roughness element thermal conductivities on turbulent convection. Results indicate that the packing density of the elements and the enhancement on the floor of the roughness distribution compete …
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The design of small propellers operating at low Reynolds numbers and associated experimental evaluation.
… test stand for use in the Baylor University subsonic wind tunnel with accompanying data acquisition code. As a result of the 46 custom propellers designed and tested, an efficiency increase of 7% and noise signature decrease of 12 dB has been achieved when compared to stock propellers on UASs …
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Analysis of various forced oscillation techniques for obtaining dynamic stability derivatives
Existing subsonic wind tunnel methods for obtaining dynamic stability derivatives for aircrafts at high angle of attack are described. From the general equations of motion of an aircraft in space, the perturbation equations of motion are derived for applying to a wind tunnel aircraft model. Data …
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Design, construction and characterization of a wind tunnel
The wind tunnel is the most fundamental test equipment for aircraft testing and studying aerodynamics. Because of the complexity of the test-subject's geometry, it is difficult to study the aerodynamic pattern simply based on theoretical calculations. Most of the aerodynamics experiments still use …
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Quantification of the boundary layer ingestion benet for the D8-series aircraft using a pressure rake system
… at NASA Langley Research Center (LaRC) 14'x22' Subsonic Wind Tunnel to determine the aerodynamic boundary layer ingestion (BLI) benet for the D8 aircraft advanced transport concept. The experiments involved a back-to-back comparison between two D8 aircraft configurations: a podded propulsion …
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Analysis of the vortical flow around a 60 degree delta wing with vortex flap
Subsonic wind tunnel investigations were conducted on a 60° swept, flat plate, delta wing with a leading edge vortex flap. The pressure distributions were measured over a range of angles of attack starting from zero to 40° in 5° interval and flap deflection angles from zero to 45° with 5° …
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Optimization of Flow Quality In the Test Section of The 30-Inch x 40- Inch Subsonic Tunnel
… the flow quality inside the 30-inch x 40-inch subsonic wind tunnel. The tunnel is an open circuit with its inlet positioned adjacent to the side door of the lab; forcing the air to make a ninety degrees turn entering the tunnel. The flow suffered from two main deficiencies, high level of …
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Experimental investigation of multielement airfoils for large-scale wind turbines
… airfoils for application to megawatt-scale wind turbines are presented in this thesis. Two different airfoil configurations tested were designed for the inboard section of a 10 MW-scale wind turbine. The airfoil systems were designed as an airfoil system to replace a baseline airfoil that is …
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Design of Synthetic Jet Actuator for Flight Control of Small UAV
… was fabricated and tests were conducted in the subsonic wind tunnel at the free stream velocities of 5 and 10 m / s. From these experiments, lift curves for two different cases (with and without the actuator) were compared.</p> <p>Two models of actuators, one with circular orifice and the other …
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Dorsal wing-flip timing in tethered flying locusts
… unilaterally with high-frequency sounds in a subsonic wind tunnel. These sequences were used to compute left and right forewing stroke kinematics in 3D. Our results show: 1) that locusts either rapidly pronate both forewings prior to the stroke reversal during an attempted turn (22 of 47 …
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The flow about a slender propellor-driven body in a temperature stratified fluid
… was conducted in the Virginia Tech 6’ X 6’ subsonic wind tunnel at free-stream Re<sub>D</sub> = 2.04 X 10⁵. The temperature variation provides a means of tracing the wake development in the near-body region. The principal effect of the propellor is to induce a more or less rigid rotation …
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A wind tunnel investigation of a wing-tip trailing vortex
A 3 'x2' subsonic wind tunnel has been constructed and calibrated. The flow in the wind tunnel accelerates 6.1 % along the test section due to boundary layer growth. The potential core flow at both the entrance and exit locations is strongly uniform. The mean velocity varies .4% across the entrance …
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Wind tunnel testing of a nacelle bypass concept for a quiet supersonic aircraft
… inch diameter axisymmetric test section of a subsonic wind tunnel at the University of Illinois at Urbana Champaign. By rotating the test section, pressure measurements were obtained over a range of circumferential angles and radial positions. The pressure measurements were used to create …
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