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Showing 1 to 20 of 20 for “"Stereoscopic Particle Image Velocimetry"”.
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Stereoscopic Particle Image Velocimetry Measurements of Swirl Distortion on a Full-Scale Turbofan Engine Inlet
… method, and measured in a sub scale tunnel using stereoscopic particle image velocimetry (SPIV) as a precursor for swirl distortion generation and characterization in an operating turbofan research engine. Diagnostic development efforts for the distortion measurements within the research engine …
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An experimental study of turbulent vortex rings using particle image velocimetry
… numbers is studied using two-dimensional and Stereoscopic Particle Image Velocimetry. In the late 1980s’ a similarity theory of turbulent vortex rings was proposed and tested primarily using a twochannel tracking Laser Doppler Velocimeter. However, due to the limitations of the experimental …
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Roughness Effects on Super Structures in Turbulent Boundary Layer Flows
… turbulent boundary layers, using wall-parallel stereoscopic Particle Image Velocimetry (PIV) at a Reynolds number of 1.3 × 106m−1. The data was collected at a distance of = 2.8 from the wall under adverse = 0.98, small = −0.04, and favorable = −0.60 pressure conditions. It was observed that …
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The turbulent structure of the jet in cross-flow
… multi-scale and statistically independent Stereoscopic Particle Image Velocimetry measurements to reveal the mean and instantaneous three-dimensional (3D) structures. All of the measurements were performed in the Counter-rotating Vortex Pair (CVP) plane for a high velocity ratio and jet …
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Mean Flow Characteristics and Turbulent Structures of Turbulent Boundary Layers in Varying Pressure Gradients and Reynolds Numbers
… measurements, and time-resolved, wall-normal, stereoscopic particle image velocimetry (TR-PIV) measurements were made. The TR-PIV data was acquired at a chord-based Reynolds number of 1.2 million, 2 million, and 3.5 million, at a sampling rate of 1 kHz, in two different camera configurations. …
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Rotor Wakes; Formations, Interactions, and Design
… Advanced flow diagnostics tools, such as stereoscopic particle image velocimetry (stereo-PIV) to quantify the wake flow in the near-field and far-field, as well as surface pressure taps, and force balance measurements to capture aerodynamic loading. A rotor-test stand was used to monitor …
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Analysis of Wingtip Vortex Structure Generated by Bio-Inspired Winglets
… the tip vortex were previously carried out using stereoscopic particle image velocimetry (sPIV). The bio-inspired winglet was tested on a rectangular NACA 0012 wing section at a 5-degree angle of attack and at a chord Reynolds number of 900,000. Velocity field measurements were recorded at 0.7 and …
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Understanding Unsteady Corner Separation Within Wing-Body Junction Flows
… = 4.5 × 10<sup>5</sup>. Time-dependent stereoscopic particle image velocimetry (TD-sPIV) was performed over a single plane. The measurement plane was offset by 13.89 mm from the trailing edge on the suction side of wing and inclined at an angle of 23.03°to the free-stream flow. This …
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A Study of Ship Airwakes Using Dual Plane Stereoscopic PIV
… using a novel time-dependent, dual plane, stereoscopic particle image velocimetry approach. Two flow planes over the flight deck, one parallel and one perpendicular to the free-stream were simultaneously measured. Measurements were carried out over four such pairs of streamwise-spanwise …
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Understanding the Structure of Wing Tip Vortices of Bio-Inspired Winglets
… feathers were tested in a low-speed wind tunnel. Particle image velocimetry (PIV), was used to study the flow field at two planes aft of the wing as the wing tip vortices developed downstream. These were time-dependent, stereoscopic particle image velocimetry (sPIV) measurements carried out at two …
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Experimental Investigation of an Actively Controlled Three-Dimensional Turret Wake
… diameter based Reynolds number of 550,000 using stereoscopic particle image velocimetry and dynamic pressure measurements both with and without active flow control. Pressure measurements were simultaneously sampled with the PIV measurements and taken on the surrounding boundary layer plate and at …
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Flow Field and Soot Formation Characteristics in Swirl-stabilized Non-premixed Turbulent Flames
… Soot volume fraction, fv, and primary soot particle size, dp, were measured using auto-compensating laser-induced incandescence, and planar three-component velocity fields were measured using stereoscopic particle image velocimetry. Measurements of planar laser-induced fluorescence of OH and …
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Fluid Dynamics of Inlet Swirl Distortions for Turbofan Engine Research
… and in a full-scale turbofan research engine. Stereoscopic particle image velocimetry (PIV) was used to collect three-component velocity fields at discrete planes downstream of the generation of the distortions with two main objectives in mind: identifying the physics behind the axial …
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Suppression of thermoacoustic instabilities in a swirl combustor through microjet air injection
… are interrogated using high-speed imaging and stereoscopic particle image velocimetry. The bulk of this work was conducted for lean propane/air flames, slightly above the lean blowoff limit. Two modes of instability were examined: the 1/4 wave mode at 40 Hz, and the 3/4 wave mode at 105 Hz. …
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Compressibility effects on large-scale structures and entrainment in turbulent planar mixing layers
… plane that are acquired via stereoscopic particle image velocimetry. Large ensembles (> 3000) of instantaneous measurements are obtained to confirm fully-developed, self-similar conditions of the mean velocity and each component of the Reynolds stress tensor. …
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The Influence of Trailing Edge Shape and Kinematics on Bio-inspired Pitching Panels
… using results obtained from multiple planes of stereoscopic particle image velocimetry. The time-averaged and time-varying performance characteristics of all the bio-inspired panels are examined through time-resolved force and torque measurements. Experiments were designed to serve as …
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Three-dimensional turbulence mechanisms in a supersonic separated/reattaching longitudinal cylinder wake
… optical measurement techniques, including stereoscopic particle image velocimetry (SPIV), which measures all three components of velocity along a large planar region, and tomographic PIV (TPIV), which measures all three components of velocity throughout a volumetric region. Large ensembles …
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An Experimental Investigation of Underbody and Near Wake Aerodynamics of Heavy Goods Vehicles
… working section. Measurements are taken using Stereoscopic Particle Image Velocimetry (SPIV), which allows three-component velocity vectors to be measured in 3D space, and a force balance. Significant differences are found between the mean flowfields of either model. Although the simple …
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Advanced experimental modelling of hydrodynamic and aerodynamic wakes in floating offshore wind turbines using particle image velocimetry
… measurement techniques, such as underwater stereoscopic particle image velocimetry (SPIV). While underwater SPIV has shown significant promise in marine engineering wave basin studies, its application in FOWT campaigns remains largely unexplored. This interdisciplinary PhD research aims to …
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Empirical mode decomposition applied to planar and volumetric velocity field measurements of a supersonic separated flow
… supersonic base flow which were obtained using particle image velocimetry. The resulting two-dimensional intrinsic mode functions reveal the various length scales associated with different regions of the flowfield. Coherent streamwise-oriented structures of different scales were detected …