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.
Results
Showing 1 to 20 of 95 for “"Pressure Rise"”.
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Investigation of a pressure rise in a shear stress gauge
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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The effects of tip clearance on axial compressor pressure rise
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Investigation on inlet and entry region characteristics on the discrete passage diffuser pressure rise performance
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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An investigation into the intramedullary pressure rise during femoral nailing: does the level and type of fracture determine peak pressures during the procedure?
… of fat embolism is a raised intramedullary pressure. Investigators have shown the direct correlation of intramedullary pressure with fat intravesation and embolism in both animal and human studies. Fat embolism syndrome is unpredictable and the true incidence is unknown. Mortality from fat …
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A Unified Framework for Characterization of Mode and Spike Routes to Rotating Stall
… behavior given an axisymmetric total-to-static pressure rise characteristic. A parametric study of the effect of the derivative of the total-to-static pressure rise with respect to flow coefficient has been carried out to (i) define the links between the computed behavior of circumferentially …
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Impeller-diffuser interaction in centrifugal compressors
… increased loss. The first two were beneficial to pressure rise while the third one was detrimental. The magnitudes of the effects were examined using different impeller-diffuser spacings and it was shown that there was an optimal radial gap size for maximum impeller pressure rise. The physical …
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A multi-zone model of the CFR engine : investigating cascading autoignition and octane rating
… knock manifests as an almost instantaneous pressure rise followed by knock ringing" pressure oscillations of similar magnitude. However, knock in the CFR engine is characterised, and measured by, a steep, but more gradual pressure rise, followed by ringing of much lesser magnitude. It has …
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Probabilistic analysis of meanline compressor rotor performance
… the tip leakage behaves like a wake in a pressure gradient and incorporating the effects of double leakage. The model is used to quantify performance variability of the rotor at design flow coefficient and near stall given typical variations in blade profile geometry, hub and casing …
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A computational study of the 3D flow and performance of a vaned radial diffuser
… the specified mass flow rate. The inlet static pressure was held constant over the height of the diffuser. The diffuser was broken down into its subcomponents to study the effects of each component on the overall performance of the diffuser. The diffuser inlet region, which comprises the …
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Model-Based Control of Gasoline Partially Premixed Combustion
… combustion-phasing controllability and its high pressure-rise rates related to premixed combustion, this puts higher demands on the engine control system. This thesis investigates model predictive control (MPC) of PPC with the use of in-cylinder pressure sensors. Online heat-release analysis is …
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Extension of the high load limit in the Homogeneous Charge Compression Ignition engine
… short burn duration can cause excessively high pressure rise rates which lead to unacceptable engine noise and potentially reduced engine life. To combat this high pressure rise rate the engine must be operating with significant diluent, either excess air or burned exhaust gas. However this high …
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Preparation, ignition and combustion of reactive metal-sulfur nanocomposites
… highest burning efficiency and highest rate of pressure rise. Materials with larger particle sizes appear to have longer ignition delays. Shorter burn times measured in the electrostatic discharge ignition test correlate with the greater rates of pressure rise obtained in the constant volume …
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Existence and Analysis of a Rotating Stall Inception Continuum & Development of Concept Questions in Fluid Dynamics
… stall inception on the compressor axisymmetric pressure rise characteristic and the characterization of mode and spike stall inception as two paths, located at the ends of a continuum of possible paths to stall. (ii) the effect of blade passage accelerations and asymmetry in the onset process, …
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Simulating the performance of the 24 ft. installed MinWaterCSP axial flow fan
… measurements of shaft power and static pressure rise, achieving RMSE values below 5% and coefficients of determination (R2) between 0.98 and 0.99, thereby confirming its reliability at small scale. Scaling analysis using fan affinity laws revealed deviations in static pressure rise …
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Freeze fracturing of elastic porous media
… processes that can potentially cause high pressures inside a cavity of a porous medium. The expansion of the water by 9% as it freezes causes flow away from the freezing front and through the porous medium, resulting in a water pressure rise inside the cavity. Flow of water towards freezing …
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Sidewall effects in compression corner shock-wave/boundary-layer interactions
… schlieren photography, oil-flow visualisation, Pressure Sensitive Paint, and Laser Doppler Velocimetry. The flows are all separated in the baseline case. The Mach 2.5 and 3.5 baseline cases both show quasi-2D separations for the majority of the tunnel span, while the Mach 1.5 baseline shows …
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Testing of a microrocket engine turbopump
… speed is 750,000 RPM, with a 23 atmospheres pump pressure rise, and an overall 30% turbomachinery efficiency. This thesis addresses the key points of the turbopump design, modelling, fabrication, and testing. A 3D CFD simulation of the pump was run and performance predicted. Cavitation risk was …
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Effects of upstream wake phasing on the performance of transonic compressors
… the upstream wake phase on the work input (i.e., rise in stagnation enthalpy across the blade row) of a transonic rotor is examined computationally and analytically. It is found that the compressor work depends on the path followed by the wake vortices as they travel through the rotor passage. …
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Performance and stalling behavior of an axial-flow compressor subjected to three circumferential inlet distortion levels
… for each inlet flow condition. Dynamic pressure transducers were employed to investigate rotating stall cell behavior during the inception of stall. Rotor blade response to distorted inflow was measured in the form of average blade pressure profiles by using a scanning valve. Results …
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Characterization of performance-limiting flow mechanisms in a centrifugal compressor stage
… operating conditions to the observed compressor pressure rise, efficiency, and operability characteristics. Despite large differences in their geometry, the two diffuser configurations exhibit similar pressure recovery characteristics due to differences in exit nonuniformity and flow angle which …
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