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 “"throughflow"”.
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Comprehensive throughflow method for steam turbine development
… model is implemented within a well-established throughflow framework, examining the impact of wake chopping on generated droplet size spectra and thermodynamic relaxation losses. A comprehensive sensitivity study of the predicted droplet spectra to modelling parameters and inlet temperatures …
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The centennial and millennial variability of the IndoPacific Warm Pool and the Indonesian Throughflow
… connection between ocean basins, the Indonesian Throughflow allows the direct transmission of heat and salinity between the Pacific and Indian Oceans. The Mg/Ca and δ18O of calcite of Globigerinoides ruber (G. ruber) were used to estimate the sea surface temperature (SST) and δ18O of water, an …
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The centennial and millennial variability of the IndoPacific warm pool and the Indonesian Throughflow
… connection between ocean basins, the Indonesian Throughflow allows the direct transmission of heat and salinity between the Pacific and Indian Oceans. Despite its potential importance, the role of the Indonesian Throughflow in global ocean circulation and regional climate is still not clear due …
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A Computer Program for the Coupled Implementation of Meanline and Throughflow Methods to Simplify the Aerodynamic Design of Multistage Axial Compressors
… tool, named C-STAAC, combines the Meanline and Throughflow analysis capabilities of two independent compressor design codes to form one standalone system. The program greatly improves the efficiency of the Preliminary-to-Throughflow stages of compressor design by providing fully coupled …
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Investigation et modélisation des tensions circonférentielles en simulation méridienne
… of multistage turbomachines. That explains why throughflow simulation is still widely used at industrial scale. The main limitation of throughflow is however the need for empirical models to reproduce blade-flow interactions and major 3D flow features. As an alternative, Adamczyk (1984) proposed …
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Investigation of a Highly Loaded, High Pressure Ratio Axial Turbine Stage for Industrial Applications
… which included parametric studies, throughflow solutions, and 2D airfoil shapes. The design procedure was defined and used for the conceptual design calculations; several parametric studies were conducted to assess the impact of various critical design parameters such as degree of …
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Body Force Modeling for Engine Inlet Fan System
<p>This thesis summarizes a novel steady-state 3D throughflow method to analyze aircraft nacelle/fan systems. The method adopts the body force concept using source terms to model the effects of fan blades. The method is designed to capture interaction effects between bypass fan and nacelle at …
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Sviluppo di strumenti per l'ottimizzazione del progetto aerodinamico di turbomacchine assiali
La tesi propone un modello throughflow inverso da impiegare durante la fase assialsimmetrica del processo di progetto di una turbomacchina. Il modello risolve con tecnica time marching le equazioni meridiane di Eulero, nelle quali un campo di forza volumica normale alle superfici medie delle pale …
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Oceanic fluxes of mass, heat, and freshwater : a global estimate and perspective
… by estimates of Ekman, boundary current and throughflow transports. A solution is found which is consistent with both the model physics and the global data set, despite a twenty five year time span and a lack of seasonal consistency among the data. The overall pattern of the global …
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Aerodynamic Performance of a Flow Controlled Compressor Stator Using an Imbedded Ejector Pump
… represented as a percentage of the passage throughflow was also documented. Significant reductions in the total pressure loss coefficient were accomplished with flow control at low cascade angles. A maximum reduction of 65% in the baseline (no flow control) loss coefficient was achieved by …
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Decadal to centennial-scale climate interactions across the Indo-Pacific region
… 2, we explore the dynamics that drive Indonesian Throughflow surface transport variability using a series of forced global high-resolution ocean simulations. We show that surface wind changes associated with Pacific decadal variability drive changes in the western boundary currents that modulate …
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Decadal to centennial-scale climate interactions across the Indo-Pacific region
… 2, we explore the dynamics that drive Indonesian Throughflow surface transport variability using a series of forced global high-resolution ocean simulations. We show that surface wind changes associated with Pacific decadal variability drive changes in the western boundary currents that modulate …
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An Improved Streamline Curvature Approach for Off-Design Analysis of Transonic Compression Systems
A streamline curvature (SLC) throughflow numerical model was assessed and modified to better approximate the flow fields of highly transonic fans typical of military fighter applications. Specifically, improvements in total pressure loss modeling were implemented to ensure accurate and reliable …
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Topics on conceptual design of the D8 aircraft : fuel burn uncertainty estimate and BLI propulsor loss modeling
… conceptual design analysis, i.e. nonaxisymmetric throughflow analysis. Two contributions to such an analysis based on a body force framework are presented in this thesis: a description of blade profile losses in incompressible flow, and a roadmap for the development of corrections that capture the …
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Oceanic transports of heat and salt from a global model and data
… ACC of approximately 0.88Sv/year. The Indonesian throughflow transport of 1 l±2Sv is within the expected range. There is also a decreasing twelve year trend in the strength of the ITF of 0.065Sv/year. The ITF is stronger in boreal summer than boreal winter by approximately 4Sv. A strong annual …
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Aerodynamic design of an aspirated counter-rotating compressor
… analysis program coupled with an axisymmetric throughflow code and a quasi-three- dimensional cascade code for blade design. The design of each stage focused on maximizing pressure ratio within diffusion factor and relative inlet Mach number (i.e. shock loss) constraints. The exit angle of the …
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Incorporation of High-Fidelity Flow Field Information into Preliminary Design of Multi-Stage Axial Compressors
… flow field. The approach can supersede current throughflow methods, increasing the fidelity of preliminary design. The primary impact of the methodology is a new capability for power gas turbine compressors to rapidly assess off-design matching at different spanwise locations along the blade …
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An improved blade passage model for estimating off-design axial compressor performance
… are capable of computing the three-dimensional throughflow with separation and reversed flow. These results pave the way for future unsteady calculations to assess compressor stability and for multistage compressor simulations at off-design conditions.
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A Hybrid Vortex Solution for Radial Equilibrium in Axial Compressors
… are generated after 1D design, meanline design, throughflow design and blade design.</p> <p>One of the key factors to evaluate compressor operation is off-design performance, which can be represented by the compressor map. Compressor maps are also generated and compared for each blade to show the …
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Experimental investigation of an aspirated fan stage
… designed to produce a pressure ratio of 1.6 at a throughflow adiabatic efficiency of 89% at a rotor tip speed of 750 ft/s. Aspiration equal to 0.5% of the inlet flow was applied to the blade surface of both the rotor and stator. Aspiration was also used on the endwall boundary layers. Detailed …
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