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Showing 1 to 10 of 10 for “"unsteady surface pressure"”.
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An Experimental Investigation of Unsteady Surface Pressure on Single and Multiple Airfoils
This dissertation presents measurements of unsteady surface pressure on airfoils encountering flow disturbances. Analysis of measurements made on an airfoil immersed in turbulence and comparisons with inviscid theory are presented with the goal of determining the effect of angle of attack on an …
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Real Airfoil Effects on Leading Edge Noise
… to determine the effects of airfoil shape on the unsteady loading spectrum on the different airfoils to attempt to explain the far-field noise. Measurements of the unsteady surface pressure on a single airfoil were made for a number of angles of attack to determine the effects of wind tunnel …
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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
Detailed surface 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 …
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Steady and Unsteady Heat Transfer in a Film Cooled Transonic Turbine Cascade
The unsteady interaction of shock waves emerging from the trailing edge of modern turbine nozzle guide vanes and impinging on downstream rotor blades is modeled in a linear cascade. The Reynolds number based on blade chord and exit conditions (5*10^6) and the exit Mach number (1.2) are …
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Open-loop and closed-loop trailing-edge separation control on a natural laminar flow airfoil
Active Unsteady Flow Control experiments were performed on a Natural Laminar Flow, NLF 0414 airfoil at Re = 1.0 × 10(6) in a 3-ft × 4-ft low-speed, low-turbulence wind tunnel. The NLF 0414 was designed with a region of favorable pressure gradient extending almost 70% of the chord on the upper …
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Analytic Solutions for Flows Through Cascades
… flow and proceed by investigating the effects of unsteady perturbations. This coupled approach provides analysis from both aerodynamic and aeroacoustic perspectives which is essential for achieving practical noise reductions. In order to find analytic solutions, sophisticated complex analysis is …
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Effects of multiple incident shock waves on the flow in a transonic turbine cascade
… aerodynamic designers are currently focusing on unsteady passage flow to increase turbine performance. In particular, for high pressure turbine stages the effects of wakes and shocks shed from an upstream blade row on the downstream blade row need to be understood. Also, experimental data is …
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Unsteady flow physics of airfoil dynamic stall
… a canonical dynamic stall process. A series of unsteady surface pressure measurements, with a high sampling frequency, were acquired in order to investigate the time-dependent behavior of the flow in the immediate vicinity of the airfoil. These surface pressure measurements were used to identify …
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Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field
… was found that there may be differences in the unsteady surface pressure over serrated edges in one-sided flows as compared to two-sided flows, like on that of an airfoil, most notably in relation to the magnitude of the unsteady pressure on the serrations. In the wall jet and in agreement with …
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Large Eddy Simulation of Shear-Free Interaction of Homogeneous Turbulence with a Flat-Plate Cascade
… spacing. Having such a large number of solid surfaces in the simulation requires very large computational grid points to resolve the boundary layers on the plates, and that is not possible with the current computing resources. In this thesis we develop a computational technique to predict the …