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Showing 1 to 20 of 46 for “"near wake"”.
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The Near Wake of a European Starling
The wake of a freely flying European starling (Sturnus vulgaris) was measured using high speed, time-resolved, particle image velocimetry, simultaneously with high speed cameras which imaged the bird. These measurements have been used to generate vector maps in the near wake that can be associated …
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The influence of buoyancy upon near wake pollutant dispersal
… pollution. One common flow feature is the wake, which is of particular interest since it is a region where pollutant is likely to accumulate and become trapped. Understanding the mechanisms of pollutant trapping within wakes, and how pollutant buoyancy might change this, is crucial to …
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Continuous curved near wake analysis for a lifting surface
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Experimental investigation of turbulent flow in the near wake of a propeller
An experimental investigation of the near wake of a five bladed 15.50 inch (393.75 mm) diameter DTNSRDC 4767A marine propeller was conducted in the VPI Stability tunnel at an advance ratio of 0.95 in a uniform free stream at 20 ft/s (6.1 m/s). Several types of data were obtained. First, the …
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An Experimental Investigation of Underbody and Near Wake Aerodynamics of Heavy Goods Vehicles
… underbody flow influences the topology of the near wake, which is also responsible for substantial drag generation. However, the underlying mechanisms of these interactions, and thus the role of the underbody flow in the development of the wake flow features, are not well understood. This …
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Visualization of twin oscillating foils in the near wake of a model destroyer
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2000.
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Controlling the Near-wake of a Circular Cylinder with a Single, Large-scale Tripwire
Control of the flow past a circular cylinder using a single tripwire on its surface has been studied experimentally as a function of the wire angular location for different wire-to-cylinder diameter ratios (0.029
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An experimental investigation of the two-stream, supersonic, near wake flowfield behind a finite-thickness base
… mechanisms and interactions ongoing in this near-wake region, an experimental investigation was conducted to obtain mean and turbulence data in a wind tunnel. The test section produced a Mach 2.56 upper stream and a Mach 2.05 lower stream which both undergo geometric separation past a …
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Time-resolved stagnation temperature and pressure measurements in the vortex street behind a cylinder
… nonuniform in such a similar manner that the near-wake patterns of instantaneous total pressure exhibit almost exact facsimiles of these of total temperature. Here, the time-accurate measurements of the fluctuating total temperature and pressure are presented by placing an aspirating probe in …
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An experimental investigation of the effects of base bleed in axisymmetric supersonic flow
… the base drag. The effects of base bleed on the near-wake flowfield of a cylindrical afterbody in a Mach 2.5 flow have been investigated in the present study. This experimental study is aimed at better understanding the complex fluid dynamic interactions occurring in the near-wake due to base …
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Computational and experimental study of trailing vortices
… ratio lifting surfaces. Vortex formation in the near-wake was measured in a wind tunnel with yaw-head and hot-wire probes at three different Reynolds numbers, the highest of which was greater than most previous studies. These near-wake measurements provided initial conditions for the far-field …
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Vortex shedding from a vibrating cable with attached spherical bodies in a linear shear flow
… was undertaken to examine the behavior in the near wake of a flexible, helically wound, high aspect ratio (L/d = 107) marine cable in a linear shear flow (steepness parameter β = 0.0053) at centerline Reynolds numbers between 2.0 x 10³ ≤ Re<sub>c</sub> ≤ 4.2 x 10⁴. Particular attention was paid …
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Dynamics and stability of flow past a circular cylinder in ground effect
… turbulent flow past a circular cylinder placed near and parallel to a moving ground. The study consists of four main parts: (i) wind tunnel experiment, (ii) numerical simulation, (iii) linear stability analysis, and (iv) proper orthogonal decomposition (POD) analysis. The main focus of the study …
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Control of supersonic axisymmetric base flows using passive splitter plates and pulsed plasma actuators
… evaluating the effects of flow control on the near-wake downstream of a blunt-based axisymmetric body in supersonic flow has been conducted. To better understand and control the physical phenomena that govern these massively separated high-speed flows, this research examined both passive and …
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The effect of dynamic operation and incoming flow on the wake of a utility-scale wind turbine
Wind turbine wakes, the regions of slower and more turbulent air behind turbines, lead to power losses up to 40% and increased structural loading on downwind turbines within a wind farm. To mitigate these detrimental effects, improved understanding of wake behavior is required. However, modeling …
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Effect of diameter ratios on the flow-sound interaction of the straight circular finned cylinders
… temporal evolution of the vortex shedding in the wake becomes more periodic when the diameter ratio of the finned cylinders (Df =Dr) increases. Moreover, the strength of the vortices increases significantly in the wake. The increase in the flow entrainment in between the fins leads to a pronounced …
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Phase front analysis of laminar vortex streets
… wavelet centres along the preceding vortexin the near wake. Vortices are located at places where the phase in each cycle is 0 or n. The phase is defined from a Kirchhoff-type phase-amplitude integral which is derived from the Biot-Savart law. Model predictions agree with reported experimental …
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Experimental and numerical investigations of the off-design flow physics in a supersonic through-flow fan cascade
The turbulent character of the supersonic wake of a linear cascade of fan airfoils has been studied experimentally using a two-component Laser Doppler Anemometer. The cascade was tested in the Virginia Polytechnic Institute and State University intermittent wind tunnel facility, where the …
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An investigation into the effects of complex topography on particle dry deposition
… windward face, decrease on the leeward face and near wake, and increase in the further wake, before returning to the flat case value. The computational results were applied to a real landscape with the use of a customised geographical information system. Good general agreement was seen when …
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Numerical Investigation of the Wake of a Rectangular Wing
Wakes of lifting bodies contain vortex sheets that roll up into strong streamwise vortices. The long time behavior of such vortices depends on the turbulence in the wake and the stability characteristics of the vortices themselves. In the near wake of a rectangular wing the flow field consists of a …
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