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 29 for “"Loss Coefficients"”.
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Determining appropriate loss coefficients for use in the nozzle-model of a stage-by-stage turbine model
… as it relates to the turbine specific loss coefficients, into the turbine stage component to allow for the development of turbine models capable of predicting turbine performance for various structural changes, anomalies and operating conditions. The development of turbine loss …
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Equitable Loss Allocation in Distribution Systems
This thesis discusses how losses can be equitably allocated to photovoltaic inverters in a residential system. One possible strategy discussed here is to optimize the active-power injections to equitably allocate losses to these inverters in distribution networks based on their kVA ratings. To …
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Experimental investigation of reversed flow in a compressor cascade
… cascade. Comparison of corrected total pressure loss curves suggested that blade rows of a compressor subjected to reversed flow may be treated as nearly equal loss producers. A comparison was made between total pressure loss coefficients from this investigation and experimental compressor …
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Computational Fluid Flow Analysis of the Enhanced-Once through Steam generator Auxiliary feedwater system
… plate. To perform the fluid analysis, the losses in the bypass leakage flow and broached hole leakage flow were first quantified and then used to model a 1/8th sector of the EOTSG. Using user defined functions (UDF), the loss coefficients of the leakage flows were implemented on the 1/8th …
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Computer aided mathematical modelling of turbulent flow for orifice metering
… of interest such as discharge and pressure loss coefficients. The model vas tested for convergence and general adequacy on an orifice of diameter ratio β= .7 in a 4 inch pipe line and at a Reynolds number of 105. Quantitative tests were then conducted on thin orifice plates in the range .3 β …
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Hydraulic model study of a manhole junction
… were developed by statistical evaluation of loss coefficients. The best of the three equations was chosen on the basis of its ability to predict flow depths and its consistency with hydraulic concepts. A procedure was then developed for using this equation to obtain a value of the required …
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A study of air flow in a network of pipes used in aspirated smoke detectors
… friction factors does not predict pressure loss and transport time results to an acceptable accuracy for this thesis. Computational Fluid Dynamics simulations were carried out at various magnitudes of disturbances similar to the effects in VESDA pipe network. The data from the CFD were …
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Experimental studies in a supersonic through-flow fan blade cascade
… From these measurements, the integrated loss coefficients are presented as a function of incidence angle along with analysis indicating the source of losses in the STFF cascade. The results are compared with calculations made using a two-dimensional, cell-centered, finite-volume, …
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The Effect of Freestream Turbulence on Separation at Low Reynolds Numbers in a Compressor Cascade
… evaluated through mass-averaged total pressure loss coefficients. The results of the study showed that the best efficiency (lowest pressure loss coefficient) was determined by separation characteristics for any angle of attack. While adding turbulence generally delayed separation, in some cases, …
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Experimental Analysis of the Interaction of Water Waves With Flexible Structures
… analysis procedure for determining reflection coefficients based on wavelet theory was developed and compared to a conventional method. The reliability of using wavelet analysis to separate a partial standing wave into incident and reflected wave components was verified with a numerical …
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Three-dimensional modelling of heat transfer from slab floors
… lack of three-dimensional foundation heat loss data. In this study, a detailed three-dimensional finite difference model of a slab floor was used to generate 93 annual simulations in parametric groups focusing on effects of size and shape, soil properties, boundary conditions, climate, …
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A row-by-row axial turbine process model based on a one-dimensional thermofluid network approach
… closure relations were obtained from the various loss coefficients for turbine stators, rotors and leakage flows which were characterised using correlations available in the literature. Several of the commonly applied loss calculation methods were investigated. A test case of a real turbine …
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Validation Studies of Single-Phase Natural Circulation Response of the Fluoride salt-cooled High-temperature Reactor (FHR)
… fairly well for the startup, heater step, and loss of heat sink transients involved in an FHR. In general, the code overestimated the flow rate and underestimated the temperatures. Inaccurate modeling of the loss coefficients and parasitic heat loss could be the largest contributing factors …
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Pressure losses at bends and junctions
… CFD simulations could yield accurate pressure loss data for input into a one-dimensional engine simulation code. The experiments were carried out on a steady flow rig, and three bends with varying degrees of curvature, a T-junction, and a Y-junction were tested. The experiments covered Reynolds …
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Fabrication of Hollow Optical Waveguides on Planar Substrates
… of a raised pedestal on the silicon substrate. Loss measurements on hollow ARROW waveguides fabricated in this manner gave loss coefficients of 0.26 cm-1 for liquid-core waveguides and 2.6 cm-1 for air-core waveguides. Fluorescence measurements in liquid-core ARROW waveguides have achieved …
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Modeling transient flow in intermittent water supply System
… which is validated by comparing computed loss coefficients with measured data reported in the literature. The research also validates predictions of mixed flow conditions (open-channel and pressured pipe flow conditions) with results from laboratory model tests. The proposed formulation …
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Advanced materials, process, and designs for silicon photonic integration
… thesis is dedicated to the development of low loss, high performance, high index contrast optical waveguides and couplers via materials, processes engineering, development, and device designs. We primarily focus on SOI single crystalline silicon (c-Si or SOI), PECVD amorphous silicon (a-Si:H, …
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Modeling of shell forming by line heating
… input, heat source velocity, spot size, heat loss coefficients, etc. are performed, and nondimensional parameters which control the bending angle are derived. Finally, an algorithm for surface development for heating path planning is developed. This algorithm minimizes the strains from the …
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