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 36 for “"Flow Angle"”.
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Mount Interference and Flow Angle Impacts on Unshielded Total Temperature Probes
… the total temperature of a high-speed fluid flow is a challenging task that is required in many research areas and industry applications. The difficulty in total temperature measurement generally stems from attempting to minimize measurement error or accurately predict error so it can be …
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Experimental and analytical assessment of cavity modes in a gas turbine wheelspace
… turbine engine operating conditions with purge flow. The experimental results and observations are complemented by computational assessments of cavity modes associated with flow in canonical cavity configurations. The cavity modes identified include Shallow Cavity modes and Helmholtz resonance. …
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Estimation of Air Flow Angles Derived from an Inertial Navigation System
… as a primary method for measuring aircraft air flow angles in flight testing. The traditional methods used to measure air flow angles consist of sensors external to the aircraft, such as an air data boom or an angle of attack probe. The advantage of using INS to measure air flow angles would be …
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Effects of rotor tip blade loading variation on compressor stage performance
… yields a relatively less-mixed-out tip leakage flow at the rotor exit and a reduction in overall tip leakage mass flow hence a lower loss generation; however, the attendant changes in tip flow angle distribution are such that there is an overall increase in the flow angle mismatch between tip …
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Corrections to inter-blade-row flow measurements in axial compressors
For industrial multistage axial compressors, flow measurements in axial gaps between the blade rows are limited by mechanical constraints and the high uncertainty of the gathered data. The main factors affecting measurement uncertainties are the confined space between the blade rows, large relative …
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Characterization of performance-limiting flow mechanisms in a centrifugal compressor stage
… computations, complemented by reduced order flow modeling. The fundamental performance-limiting flow mechanisms in the diffuser are identified and used to physically relate important geometry features and operating conditions to the observed compressor pressure rise, efficiency, and …
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Experimental and Numerical Investigations of Optimized High-Turning Supercritical Compressor Blades
Cascade testing and flow analysis of three high-turning supercritical compressor blades were conducted. The blades were designed at an inlet Mach number (M1) of 0.87 and inlet flow angle of 48.4 deg, with high camber angles of about 55 deg. The baseline blade was a conventional Controlled Diffusion …
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Investigation of stall inception in centrifugal compressors using isolated diffuser simulations
… of centrifugal compressors, where these flows are not present, suggesting an alternative mechanism may be at play. Unsteady Reynold's Averaged Navier-Stokes simulations are performed for an isolated vaned radial diffusers from a highly loaded centrifugal compressor. Key to their success …
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Manufacturing Variability in High Pressure Turbine Rotor Blades
… (RANS) CFD. From this study, an exit flow angle-based blade reorientation procedures and a functional sentencing methodology were proposed. For a statistically non-representative sample, these changes to the manufacturing process reduces the spread in stage capacity from ~±0.5% to …
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Hotwire measurements of the turbulent flow into a cascade of controlled-diffusion compressor blades
… of .25, a Reynolds number of 711000 and an inlet flow angle of 48 degrees. Turbulence profiles obtained in the pitch-wise direction were found to be in good agreement with previous LDV measurements. These data indicated a localized increase in turbulence around the leading edge due to the …
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A New Method for Generating Swirl Inlet Distortion for Jet Engine Research
… stream, jet engines are very sensitive to inlet flow nonuniformities. This makes the study of the effects of inlet nonuniformities essential to improving jet engine performance. Swirl distortion is the presence of flow angle nonuniformity in the inlet stream of a jet engine. Although several …
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An Investigation into the impact of the spanwise flow field at rotor inlet on the performance of mixed flow turbines
… method to achieve this is the use of mixed flow turbines. However, compared to conventional radial flow turbines, mixed flow turbines experience increased flow separation from the hub side of the blade suction surface. This has a detrimental impact on turbine efficiency. The separation is …
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Flutter of laminated plates in supersonic flow
… is that given by linear piston theory with flow at arbitrary cross-flow angles. Flutter solutions were obtained for typical symmetric, angle-ply, and general laminated composite plates, and a limited parametric study was conducted. The parameters studied include the number, orientation, and …
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Steady and Unsteady Maneuvering Forces and Moments on Slender Bodies
… been measured on slender bodies in both static angle conditions as well as rapid time-dependent large amplitude maneuvers with the Dynamic Pitch Plunge Roll (DyPPiR) apparatus. <br /> <br /> Lateral and transversal forces as well as all three moments have been measured at static angles of attack …
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Experimental and numerical investigation of second-generation, controlled-diffusion, compressor blades in cascade.
… compressor-stator blades at an off-design inlet-flow angle of 39%5c Investigation of the blades took place in a low-speed cascade wind tunnel using various experimental procedures. The objective of the wind tunnel study was to characterize the flow field in and around the blades at the off-design …
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Depth map recovery from videos
… belong to the same object share similar optical flow angles, and have smooth optical flow angle gradients, that can be exploited to recover object boundaries, thereby isolating moving objects from the static part of the scene. \\ It recovers the relative depth of the static part of the scene by …
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Probabilistic analysis of meanline compressor rotor performance
… performance variability of the rotor at design flow coefficient and near stall given typical variations in blade profile geometry, hub and casing diameters, and tip clearances. Monte Carlo simulation performed at both operating conditions shows that the coefficient of variation of pressure rise, …
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Numerical Loss Prediction of high Pressure Steam Turbine airfoils
… mid radius and tip profile) as a function of angle of incidence and exit Mach numbers, is numerically computed at 0.3 axial chords downstream of the trailing edge. It was found that the average loss coefficient was low, owing to the fact that the flow over the airfoils was well behaved. The …
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LDV measurements in a Navy CPS fan
… rotor cycle and (2) averaged at each rotation angle. Upstream bimodal probability densities of the axial velocity component were found in the cycle-averaged data. Bimodal distributions indicate instabilities in the stagnation or separation lines or vortex shedding. The phase-averaged data show …
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Turbine inlet non-uniformities and unsteady mechanisms
… identified are a localized reduction in flow-through time for wake fluid near the pressure surface, compared to the freestream, and an unsteady pressure field (Op/&t) in the rotor reference frame that increases work extraction in the freestream relative to wake fluid. For the second model …
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