Global ETD Search
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 42 for “"Shadowgraph"”.
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Shadowgraph and Zoltan's food
<p>The two collections of poems in this work, Shadowgraph and Zoltan's Food, demonstrate the role inheritance plays in the lives of those underrepresented in the annals of American and world history. Shadowgraph is comprised of autobiographical lyric poems that revolve around the author's struggles …
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Photographic materials for interferometer, schlieren, and shadowgraph apparatus
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1953
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Laser shadowgraph study of early flame propagation in swirling flows near the lean misfire limit.
… for an equivalence ratio of 0.645 using the shadowgraph technique. The circular and the elliptical models are used as flame contours to calculate the flame speed and the convection velocity. The circular model indicates that the flame speed decreases as the swirl flow decays and as the spark …
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Supersonic flow field visualization studies of the MÅ = 6 price waverider planform
… (side-view) and vertical (top-view) mounted shadowgraph pictures and pressure sensitive paint images were taken at pitch angles of â ¿ = 0Šʺ, 2Šʺ and 4Šʺ. The Mach 4 shadowgraph and pressure sensitive paint results correlate well with previous CFD results using the three-dimensional …
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Development of experimental techniques and studies of spatial structure in turbulent thermal convection
Particle-image velocimetry (PIV), shadowgraph, and thermochroic liquid crystal techniques are applied to the study of spatial structure of turbulent thermal convection in wide horizontal water layers. A large-aspect-ratio test section for the study of turbulent Rayleigh convection in water has been …
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Experimental investigations of the effects of surfactants on droplet production by bubbles rising to a free surface.
… the free surface are obtained with diffuse light shadowgraph images. A laser-light high-speed cinematic shadowgraph system is employed to record and measure the diameters and motions of the droplets. The movies are processed on a custom-built MATLAB code which measures droplets as small as 100 …
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Measurements of Scalar Convection Velocity in Heated and Unheated High-Speed Jets
… on the same nozzle at heated conditions. Shadowgraph imaging is used as a qualitative tool to locate shock cells within the jet plume. TR-DGV data from near the lipline (r = 0.5D) is axially aligned with the shadowgraph images to demonstrate that the shock structure within the potential …
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An experimental investigation of the effects of base bleed in axisymmetric supersonic flow
… static pressure measurements, schlieren and shadowgraph photography, and two-component laser Doppler velocimetry (LDV). The comprehensive LDV mean velocity and turbulence measurements obtained during this study provide valuable insight into the physics of the base bleed mechanism and …
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Unsteady shock wave effects on transonic turbine cascade performance
… both qualitative and quantitative information. Shadowgraph photos of the unsteady shock wave propagation through the cascade indicate presence of a vortical region and its movement from the blade surface into the passage flow. A previously unseen distortion of the trailing edge shock wave is …
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UNSTEADY PRESSURE MEASUREMENTS IN A SUPERSONIC INLET DURING UNSTART SIMULATIONS
… record unsteady pressure measurements and a shadowgraph while actuating the louver system. Once repeatability was proven, computational fluid dynamics (CFD) simulations based on the experiment were developed in ANSYS CFX, and computational solutions were developed. The experimental …
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Preliminary experiment and analysis of supersonic inlet buzz
… based on internal pressure measurement and shadowgraph pictures during stable operations revealed the substantial influence of the separated flow inside the model. Possible increase in subsonic Mach number at the inlet entrance with decreasing exit throttle area, which could promote an …
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Experimental study of supersonic slot injection into a supersonic stream
… ρ̅ were also generated. Spark Schlieren and Nano-Shadowgraph pictures were taken of the flowfield. The results showed excellent repeatability and documented the development of the injected flow to beyond the region where the outer shear layer and wall boundary layer had merged. The effect of a …
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Evaluation Of Nozzle Geometry On High Pressure Gasoline Direct Injection Spray Atomization
… of the simulation results with near-field shadowgraph and Mie scatter imaging as well as phase-contrast x-ray imaging is provided. When near-field experimental imaging validated the simulation results further investigation of the fundamental flow mechanism internal to the injector was …
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Gas dynamic and acoustic interactions with supersonic free shear layers
… (300,000 frames/sec) Mie-scattering and shadowgraph techniques were employed to track the evolution of these structures in the mixing layer. A covariance algorithm was developed to obtain quantitative information about the size, shape, orientation and convection speed of these structures …
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Experimental studies in a supersonic through-flow fan blade cascade
… wave patterns were recorded using spark shadowgraph photography and steady-state instrumentation was used to measure blade surface pressure distributions and downstream total and static pressure distributions. A two-dimensional LDV system was used to map the downstream flowfield. From …
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Compressible turbulence in a high-speed high Reynolds number mixing layer
… visualization was accomplished by nanosecond Shadowgraph photography. The overall flow structure was documented with the Shadowgraph and conventional mean flow probes (Pitot pressure, cone-static pressure, and thermocouple probes). The turbulent structure of the flow field was also clearly …
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Effects of Mach Number and Flow Incidence on Aerodynamic Losses of Steam Turbine Blades
… pressures. Flow visualization techniques such as shadowgraph photography and color oil flow visualization were performed to complement the measured data. When the exit Mach number for both nozzles increased from 0.9 to 1.1, the total pressure loss coefficient increased by a factor of 7 as compared …
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Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water
… this work, Particle Image Velocimetry (PIV) and shadowgraph flow visualization experiments have been conducted on submerged round gas jets of varying speeds and nozzle diameters with the goal of improving our understanding of the entrainment process in a two-phase (gas-liquid) jet. The total …
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Experimental Investigation of the Effects of a Passing Shock on Compressor Stator Flow
… on the stator flow field were investigated using shadowgraph photography and Digital Particle Image Velocimetry (DPIV). Measurements were taken for three different shock strengths. In every case studied, a vortex formed near the stator trailing edge as the shock impacted the blade. The size of …
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Experimental study of internal gravity waves over a slope
… by these high-frequency waves well upslope. Shadowgraph observations show that, if the wave characteristics are coincident, or nearly so, with the bottom slope, the upslope propagation of the low-frequency waves causes a line of regularly spaced vortices to form along the slope. Subsequent …
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