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 16 of 16 for “"profile loss"”.
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Flow losses in supersonic compressor cascades
Loss models used in compression system performance prediction codes are often developed from the study of two-dimensional cascades. The physical mechanisms that affect the flow in supersonic compressor cascades have been reviewed, including the changes in shock geometry that will occur with back …
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Loss mechanisms in a highly loaded transonic axial turbine stage
… turbine technology is assessed for its role in loss generation. Steady and unsteady two-dimensional and three-dimensional flow computations, complemented by simplistic control volume analyses as well as test data, provided results for establishing the quantitative level of loss from various …
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Cascade performance of a double arc compressor blade at low Reynolds number
… the blade surface, the flow deflection, and the profile loss are compared to the data obtained from the computer program for different angles of incidence. The comparison of experimental and theoretical results is in general agreement except for the losses and deflection angles at large positive …
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An experimental determination of the trailing-edge base pressure on blades in transonic turbine cascades
… plays an important role in determining the profile loss on blades with thick trailing edges, both the base pressure and the blade losses are presented for a range of transonic exit Mach numbers. The overall objective of this work is to provide experimental data for improving current …
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The effect of reaction on compressor performance
… either result in the maximum, or the minimum, profile loss. When the solidity is set by the shape factor of the suction-surface boundary layer at the blade trailing-edge, and conventional levels of design work coefficient (Ψ=0.44) and flow coefficient (Φ=0.60) are set, the profile loss becomes …
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Investigation of Aerodynamic Profile Losses for a Low-Reaction Steam Turbine Blade
… was the refinement of a proprietary empirical profile loss model. A review of the literature shows that experimental data on this type of blade is not openly available. The continued efficacy of empirical loss models to low-reaction steam turbine blades requires data from experiments such as …
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The Impact of Combustor Turbulence on Loss Mechanisms in the High Pressure Turbine
… the effect of combustor turbulence on the loss mechanisms which occur in a turbine blade row. The thesis has a number of important findings. The combustor turbulence is characterised and is shown to be isotropic in nature. It shows that, when no pressure gradient is present, combustor …
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Compressor leading edges
… it is shown that these spikes will increase the loss generated by a blade only when they become large enough to initiate boundary layer transition at the leading edge through a separation bubble; this process increases profile loss by about 30%. A criterion is presented, based on the spike …
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Development of "Core-Suction" Technique for Fabrication of Highly Doped Fibers for Optical Amplification and Characterization of Optical Fibers for Raman Amplification
… fibers were measured for refractive index profile, loss spectrum and spontaneous Raman spectra. Elemental analysis of the fiber samples was also performed using an electron microprobe. Erbium doped fiber amplifiers (EDFAs) were setup using 30 cm, 5cm and 1 cm lengths of fabricated erbium …
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The Effect of Heat Transfer on Turbine Performance
… future cooling systems, when added to a blade profile, could reduce profile loss by up to 9%. Furthermore, the generality of the new method allows all cooled components, however complex, to be systematically analysed for the first time. This is demonstrated using a computational approach. The …
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Assessment And In Vitro Repair Of Damaged Dna Templates From Forensic Stains
… sample precludes the ability to obtain a genetic profile for purposes of identification been examined. The primary aims of this work were first to ascertain the types of DNA damage encountered in forensically relevant stains, correlating the occurrence this damage with the partial or total loss of …
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The impact of moisture-induced aggregation of soy protein isolate and hydrolysate during storage on product and nutritional quality
… Change in color, % solubility, protein/peptide profile, loss of free amino groups, formation of fluorescent Maillard compounds, and denaturation were monitored using well-established methods of analysis. Reaction kinetics were used when possible to better understand the effects of storage …
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Three-dimensional Mechanisms in Compressor Flows
… by not considering the effect, on separation and loss, of the pressure gradient on the surface of the blade perpendicular to the meridional direction, here known as the transverse pressure gradient. The results of this thesis are contained within four chapters. The first two investigate the role …
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A Data-Centric Approach to Loss Mechanisms for Compressor Preliminary Design
… blades. It is shown using 2D data that a new profile loss model can be developed which halves the error in preliminary design correlations and generalises well to turbines as well as compressors. The reason for these improvements is shown to be the result of a more physically accurate …
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Distortion Tolerant Fan Design
… improved by modifying the fan rotor radial work profile and explain the mechanism that allows BLI fans to operate stably even when there are regions where the fan operates beyond the clean flow stability limit. Two test cases were used: a low speed rig fan and a representative transonic fan. The …
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Numerical lnvestigation of Disturbance Environments in Low Pressure Turbines
… in reducing the separated region and hence, the profile loss, which is further accentuated in the presence of free-stream turbulence. A blade fluctuating at higher reduced frequency is found to be more effective in shrinking the separation region. Blade vibration is found to increase the level of …