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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Free Stream Turbulence"”.
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Effects of Free Stream Turbulence on Compressor Cascade Performance
The effects of grid generated free-stream turbulence on compressor cascade performance was measured experimentally in the Virginia Tech blow-down wind tunnel. The parameter of key interest was the behavior of the measured total pressure loss coefficient with and without generated free-stream …
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Effects Of Large-Scale Free Stream Turbulence On A Turbulent Boundary Layer
… in which there are systematic variations of free stream turbulence above a flat plate boundary layer are presented. Upstream of the plate, an active grid generates free stream turbulence varying in intensity from 0.25% to 10.5%. The momentum thickness Reynolds number of the boundary layer …
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An Experimental Study of Turbulent Boundary Layers Subjected to High Free-stream Turbulence Effects
… at zero pressure gradient subjected to high free-stream turbulent intensities of up to 7.9% in preparations for high free-stream turbulence studies on three-dimensional boundary layers, which will be done in the future in the Aerospace and Ocean Engineering Boundary Layer Wind Tunnel at …
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The Effects of Free Stream Turbulence on the Flow Field through a Compressor Cascade
… made to reveal the effects of grid generated turbulence on this flow. The data set is unique in that not only does it give a comparison of elevated free stream turbulence effects, but also documents the developing flow through the blade row of a compressor cascade with tip leakage. …
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A frequency domain analysis of surface heat transfer/free-stream turbulence interactions in a transonic turbine cascade
… time-resolved surface heat flux to the turbulent free-stream flow over a turbine blade is investigated. Measurements are made in a transonic linear cascade with a modem high pressure turbine blade profile. Time-resolved direct heat transfer measurements are made with Heat Flux Microsensor (HFM) …
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Turbulent wakes in turbulent streams
… have been used to study the effects<br/>of free-stream turbulence on axisymmetric wakes. In both cases the wake was introduced to<br/>various turbulent streams having various levels of turbulence intensity and length scales. It<br/>was found that the presence of the free-stream turbulence …
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An interferometric study of unsteady passing shock flow in a turbine cascade
… allowing the required 100 ns shutter times to “freeze” the passing shock. High frequency Kulite pressure transducers and miniature hot wire probes were used to capture the required known density field for the quantitative evaluation of the flowfield. Variations in the density field data as the …
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Numerical lnvestigation of Disturbance Environments in Low Pressure Turbines
… are investigated. In particular, the effects of free-stream turbulence (FST), unsteady wakes, roughness and blade oscillations on the separation-induced transition on the suction surface of a low pressure turbine blade are analyzed. Two configurations are considered: (i) a flat plate subjected to …
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Multi-Fidelity Study of Complex Multi-Scale Flows Concerning Stagnation Probes
… design are suggested that either reduce downstream pressure loss between 10 to 35% or maximise the temperature recovery for a range of inflow conditions. Although an isolated probe can by itself present a range of flow features, the complexity was increased to simulate a real-world condition …
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Analysis and Improvement of Aerodynamic Performance of Straight Bladed Vertical Axis Wind Turbines
… to collectively investigate the role of external turbulence on the SB-VAWTs operation. The external free-stream turbulence is known as one of the most important factors influencing VAWTs since this type of turbines is mainly considered for urban applications where the wind turbulence is of great …
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Large Eddy Simulations of complex turbulent flows
… concepts. LES is an intermediate approach to turbulence simulation in which the onus of modeling of “universal” small scales is appropriately transferred to the resolution of “problem-dependent” large scales or eddies. IBM combines the efficiency inherent in using a fixed Cartesian grid to …
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Prediction of transitional boundary layer properties for CFD software in engineering flows
… Shaw (1980) correlation, a meaningful average of free stream turbulence intensity in the flow was required. It was found that a reasonable estimate could be found by integrating the free stream intensity value from the inlet and taking the average.<br/><br/>A new method was developed to overcome …
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Performance of Self-excited Energy Harvesters with Tip Bodies of Non-circular Cross Section Shapes
… voltage output of the harvesters at different free stream velocities. The presence of the aeroelastic galloping instability was detected by the behavior of the transversal tip displacement of the harvester as well as the coupling of the motion and shedding frequency from the bluff body. The …
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The effect of free stream disturbances and control surface deflections on the performance of the Wortmann airfoil at low Reynolds numbers
… of selected acoustic disturbance and increased free-stream turbulence. The wind-tunnel test-section environment is, therefore, capable of considerably altering wing performance in this regime.
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Large Eddy Simulation of Shear-Free Interaction of Homogeneous Turbulence with a Flat-Plate Cascade
Studying the effects of free stream turbulence on noise, vibration, and heat transfer on structures is very important in engineering applications. The problem of the interaction of large scale turbulence with a flat-plate cascade is a model of important problems in propulsion systems. Addressing …
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Computational study of hub corner stall in an axial compressor rotor
… Flow Program. A one equation, q-L, transitional turbulence model was used with MEFP for closure of the transport equations. The calculation was used to study the physics and flow mechanisms affecting hub corner stall. Preprocessing and post processing programs were written to aid this study, a …
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Experimental Study of the Heat Transfer on a Squealer Tip Transonic Turbine Blade with Purge Flow
… under transonic conditions and high inlet free stream turbulence intensity. The blade design was provided by Solar Turbines Inc., and consists of a double squealer around the pressure and suction sides, two purge flow blowing holes located downstream of the leading edge and mid-chord, four …
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The numerical simulation of turbulent boundary layers and film cooling
… transfer, turbulent boundary layers subjected to free stream turbulence, and supersonic adiabatic turbulent boundary layers. Good agreement between the present results and benchmark results in the literature was achieved;With the new numerical method and boundary condition technique it is possible …
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High Fidelity Simulation of Loss Mechanisms in Compressors
… vortex and compressor cascade subjected to freestream turbulence. The results show that both resolving local entropy generation rate and capturing the inception and growth of instabilities are critical to accuracy of loss prediction. In particular, the interaction of free-stream turbulence …
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Experimental and Numerical Investigations of the Effects of Incident Turbulence on the Flow Over a Surface-Mounted Prism
The issue of the effects of free stream turbulence on the flow field over a surface-mounted prism is examined through experimental and numerical investigations. In the experimental studies, particle image velocimetry measurements are conducted in the ESM water tunnel at Reynolds number of $9,600$ …
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