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This master thesis describes the assessment of secondary flows model for a viscous throughflow solver in the scope of two test cases. They are the classic axial compressor stage CME2 and a multi-stage axial low-pressure compressor with highly loaded blades developed by Safran Aero Boosters.

The review of the literature for secondary flow models has shown that geometrical and flow parameters are of great importance in the formulation of these correlations.

By the comparison with three-dimensional RANS simulations, the assessment of the reliability of different types of correlations for design and off-design conditions, various boundary layer thicknesses and blade geometries has shown that the distributions for the total pressure loss coefficient and deviation angle from Roberts are providing the most promising results.

However, the implementation of Roberts’ correlations in theirs current forms in the throughflow model has not shown a substantial improvement in terms of the prediction of performance maps for the two test cases.

Even tough secondary flows physics are still hardly predictable, such models can be completed by additional terms and coefficients for improving preliminary design applications. Some suggestions are discussed at the end of this thesis.

computational fluid dynamics --- meridional plane --- 3D blades --- axial compressor --- Adamczyk's cascade --- deviation angle --- profile loss --- RANS --- throughflow model --- secondary flows --- Ingénierie, informatique & technologie > Ingénierie aérospatiale

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This Special Issue book contains selected papers from works presented at the 9th EASN (European Aeronautics Science Network) International Conference on Innovation in Aviation & Space, which was held in Athens, Greece from the 3rd until the 6th of September, 2019. About 450 participants contributed to a high-level scientific gathering, providing some of the latest research results on the topic, as well as some of the latest relevant technological advancements. Eight interesting articles, which cover a wide range of topics including characterization, analysis and design, as well as numerical simulation, are contained in this Special Issue.

Technology: general issues --- History of engineering & technology --- electric propulsion --- aircraft --- CENTRELINE --- DC link voltage level --- analytical model --- design space exploration --- gas-turbine performance --- turboshaft --- axial compressor --- blade --- FEM --- CFD --- erosion --- wear --- stall margin --- compressor surge --- brownout --- aircraft thermal management --- hybrid electric propulsion --- surface heat exchanger --- superhydrophobic --- coating --- anti-icing --- spray-coat --- aeronautical --- gas turbine engine --- performance model --- gas path analysis --- robust estimation --- identification --- regularization --- fuzzy set --- membership function --- CubeSat --- CFRP --- structural integration --- functional integration --- structural battery --- embedded battery --- carbon fibre thermoplastic composite --- PEEK matrix --- woven --- aging --- mechanical testing --- static and fatigue --- STOL aircraft --- propeller --- Pareto sets --- propeller optimization --- n/a

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This Special Issue book contains selected papers from works presented at the 9th EASN (European Aeronautics Science Network) International Conference on Innovation in Aviation & Space, which was held in Athens, Greece from the 3rd until the 6th of September, 2019. About 450 participants contributed to a high-level scientific gathering, providing some of the latest research results on the topic, as well as some of the latest relevant technological advancements. Eight interesting articles, which cover a wide range of topics including characterization, analysis and design, as well as numerical simulation, are contained in this Special Issue.

Technology: general issues --- History of engineering & technology --- electric propulsion --- aircraft --- CENTRELINE --- DC link voltage level --- analytical model --- design space exploration --- gas-turbine performance --- turboshaft --- axial compressor --- blade --- FEM --- CFD --- erosion --- wear --- stall margin --- compressor surge --- brownout --- aircraft thermal management --- hybrid electric propulsion --- surface heat exchanger --- superhydrophobic --- coating --- anti-icing --- spray-coat --- aeronautical --- gas turbine engine --- performance model --- gas path analysis --- robust estimation --- identification --- regularization --- fuzzy set --- membership function --- CubeSat --- CFRP --- structural integration --- functional integration --- structural battery --- embedded battery --- carbon fibre thermoplastic composite --- PEEK matrix --- woven --- aging --- mechanical testing --- static and fatigue --- STOL aircraft --- propeller --- Pareto sets --- propeller optimization --- electric propulsion --- aircraft --- CENTRELINE --- DC link voltage level --- analytical model --- design space exploration --- gas-turbine performance --- turboshaft --- axial compressor --- blade --- FEM --- CFD --- erosion --- wear --- stall margin --- compressor surge --- brownout --- aircraft thermal management --- hybrid electric propulsion --- surface heat exchanger --- superhydrophobic --- coating --- anti-icing --- spray-coat --- aeronautical --- gas turbine engine --- performance model --- gas path analysis --- robust estimation --- identification --- regularization --- fuzzy set --- membership function --- CubeSat --- CFRP --- structural integration --- functional integration --- structural battery --- embedded battery --- carbon fibre thermoplastic composite --- PEEK matrix --- woven --- aging --- mechanical testing --- static and fatigue --- STOL aircraft --- propeller --- Pareto sets --- propeller optimization

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This Special Issue book contains selected papers from works presented at the 10th EASN (European Aeronautics Science Network) International Conference on Innovation in Aviation & Space, which was held from the 2nd until the 4th of September, 2020. About 350 remote participants contributed to a high-level scientific gathering providing some of the latest research results on the topic, as well as some of the latest relevant technological advancements. Eleven interesting articles, which cover a wide range of topics including characterization, analysis and design, as well as numerical simulation, are contained in this Special Issue.

Technology: general issues --- History of engineering & technology --- boarding --- simulation --- cabin --- aircraft --- passenger --- movement --- Covid-19 --- turbofan --- unmanned aerial vehicles --- cruise missile --- aerial target --- axial compressor --- blade --- titanium alloy --- aluminium alloy --- titanium aluminide --- safety factor --- thermal management --- hybrid-electric aircraft --- ram air-based cooling --- compact heat exchangers --- meredith effect --- aircraft air quality --- adaptive ECS --- subject testing --- boundary layer ingestion --- propulsive fuselage --- wake-filling --- turbo-electric --- proof-of-concept --- wind tunnel --- fan rig --- multi-disciplinary aircraft design --- collaborative research --- microturbine --- sustainable aviation fuel --- ATJ --- HEFA --- emissions --- alternative fuel --- biocomponent --- combustion --- fuel blend --- drop-in fuel --- synthesized kerosene --- cargo fire protection --- fire suppression --- testing --- iron bird --- hydraulic system --- flight simulator --- force control --- PID control --- unmanned aircraft --- thrust determination --- flight testing --- e-Genius-Mod --- free-flight wind tunnel --- hybrid-electric propulsion --- regional air travel --- alternate airports --- top-level aircraft requirements --- figures of merit --- aircraft design --- aircraft structure --- strut-braced wing --- parametric modeling --- decomposition principles --- strength analysis --- finite element method (FEM) --- doublet lattice method --- four-level approach --- boarding --- simulation --- cabin --- aircraft --- passenger --- movement --- Covid-19 --- turbofan --- unmanned aerial vehicles --- cruise missile --- aerial target --- axial compressor --- blade --- titanium alloy --- aluminium alloy --- titanium aluminide --- safety factor --- thermal management --- hybrid-electric aircraft --- ram air-based cooling --- compact heat exchangers --- meredith effect --- aircraft air quality --- adaptive ECS --- subject testing --- boundary layer ingestion --- propulsive fuselage --- wake-filling --- turbo-electric --- proof-of-concept --- wind tunnel --- fan rig --- multi-disciplinary aircraft design --- collaborative research --- microturbine --- sustainable aviation fuel --- ATJ --- HEFA --- emissions --- alternative fuel --- biocomponent --- combustion --- fuel blend --- drop-in fuel --- synthesized kerosene --- cargo fire protection --- fire suppression --- testing --- iron bird --- hydraulic system --- flight simulator --- force control --- PID control --- unmanned aircraft --- thrust determination --- flight testing --- e-Genius-Mod --- free-flight wind tunnel --- hybrid-electric propulsion --- regional air travel --- alternate airports --- top-level aircraft requirements --- figures of merit --- aircraft design --- aircraft structure --- strut-braced wing --- parametric modeling --- decomposition principles --- strength analysis --- finite element method (FEM) --- doublet lattice method --- four-level approach

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The demand for computational fluid dynamics (CFD)-based numerical techniques is increasing rapidly with the development of the computing power system. These advanced CFD techniques are applicable to various issues in the industrial engineering fields and especially contribute to the design of fluid machinery and fluid devices, which have very complicated unsteady flow phenomena and physics. In other words, to aid the rapid development of CFD techniques, the performances of fluid machinery and fluid devices with complicated unsteady flows have been enhanced significantly. In addition, many persistently troublesome problems of fluid machinery and fluid devices such as flow instability, rotor–stator interaction, surging, cavitation, vibration, and noise are solved clearly using advanced CFD techniques.This Special Issue on “CFD-Based Research and Applications for Fluid Machinery and Fluid Devices” aims to present recent novel research trends based on advanced CFD techniques for fluid machinery and fluid devices. The following topics, among others, are included in this issue:- CFD techniques and applications in fluid machinery and fluid devices;- Unsteady and transient phenomena in fluid machinery and fluid devices;- Pumps, fans, compressors, hydraulic turbines, pump turbines, valves, etc.

Technology: general issues --- centrifugal fan --- noise characteristics --- power consumption --- negative pressure --- sound pressure --- mechanical seal --- dynamic characteristics --- extrusion fault --- numerical simulation --- sealing performance --- fluent --- inducer --- step casing --- varying pitch --- cavitating flow and instabilities --- partial similarity principle --- flow similarity --- stability improvement --- multi-condition optimization --- cavitation performance --- artificial neural networks (ANN) --- net positive suction head (NPSH) --- double suction --- cascade --- aerodynamic --- parameterization --- plane cascade design --- incidence angle --- PSO-MVFSA --- optimization --- two-vane pump --- Computational Fluid Dynamics (CFD) --- Reynolds-averaged Navier-Stokes (RANS) --- machine learning --- energy recovery --- pump as turbine --- vortex --- hydraulic losses --- pressure fluctuation --- transient characteristics --- centrifugal pump --- startup period --- solar air heater --- ribs --- Nusselt number --- friction factor --- Reynolds-averaged Navier-Stokes equations --- thrust coefficient --- power coefficient --- figure of merit --- frozen rotor --- UAV --- octorotor SUAV --- aerodynamic performance --- rotor spacing --- hover --- CFD --- vortices distribution --- shape optimization --- Francis turbine --- fixed flow passage --- flow uniformity --- blade outlet angle --- Sirocco fan --- URANS --- volute tongue radius --- internal flow --- noise --- film cooling --- large eddy simulation --- triple holes --- blowing ratio --- adiabatic film-cooling effectiveness --- proper orthogonal decomposition --- axial compressor --- tip clearance --- flow field --- clearance --- flow function --- gas turbine --- leakage --- pressure ratio --- stepped labyrinth seal --- axial-flow pump --- root clearance radius --- computational fluid dynamics --- entropy production --- energy dissipation --- vortex pump --- lateral cavity --- open-design --- spiral flow --- reactor coolant pump (RCP) --- waviness --- leakage rate --- liquid film --- axial fan --- reversible --- jet --- design --- thrust --- energy characteristics --- mixing --- pitched blade turbine --- impeller --- inverse design method --- matching optimization --- diffuser --- small hydropower --- tubular turbine --- fish farm --- performance test --- design factors --- optimum model --- the mixed free-surface-pressurized flow --- characteristic implicit method --- relative roughness --- vent holes --- optimization control --- microchannel heat sink --- wavy microchannel --- groove --- heat transfer performance --- laminar flow --- multi-objective optimization --- LHS --- full factorial methods --- pump-turbine --- dynamic stress --- start-up process --- vortex generator (VG) --- computational fluid dynamics (CFD) --- cell-set model --- RANS --- LES --- multistage centrifugal pump --- double-suction impeller --- twin-volute --- inducer-type guide vane --- trailing edge flap (TEF) --- trailing edge flap with Micro-Tab --- deflection angle of the flap (αF) --- centrifugal fan --- noise characteristics --- power consumption --- negative pressure --- sound pressure --- mechanical seal --- dynamic characteristics --- extrusion fault --- numerical simulation --- sealing performance --- fluent --- inducer --- step casing --- varying pitch --- cavitating flow and instabilities --- partial similarity principle --- flow similarity --- stability improvement --- multi-condition optimization --- cavitation performance --- artificial neural networks (ANN) --- net positive suction head (NPSH) --- double suction --- cascade --- aerodynamic --- parameterization --- plane cascade design --- incidence angle --- PSO-MVFSA --- optimization --- two-vane pump --- Computational Fluid Dynamics (CFD) --- Reynolds-averaged Navier-Stokes (RANS) --- machine learning --- energy recovery --- pump as turbine --- vortex --- hydraulic losses --- pressure fluctuation --- transient characteristics --- centrifugal pump --- startup period --- solar air heater --- ribs --- Nusselt number --- friction factor --- Reynolds-averaged Navier-Stokes equations --- thrust coefficient --- power coefficient --- figure of merit --- frozen rotor --- UAV --- octorotor SUAV --- aerodynamic performance --- rotor spacing --- hover --- CFD --- vortices distribution --- shape optimization --- Francis turbine --- fixed flow passage --- flow uniformity --- blade outlet angle --- Sirocco fan --- URANS --- volute tongue radius --- internal flow --- noise --- film cooling --- large eddy simulation --- triple holes --- blowing ratio --- adiabatic film-cooling effectiveness --- proper orthogonal decomposition --- axial compressor --- tip clearance --- flow field --- clearance --- flow function --- gas turbine --- leakage --- pressure ratio --- stepped labyrinth seal --- axial-flow pump --- root clearance radius --- computational fluid dynamics --- entropy production --- energy dissipation --- vortex pump --- lateral cavity --- open-design --- spiral flow --- reactor coolant pump (RCP) --- waviness --- leakage rate --- liquid film --- axial fan --- reversible --- jet --- design --- thrust --- energy characteristics --- mixing --- pitched blade turbine --- impeller --- inverse design method --- matching optimization --- diffuser --- small hydropower --- tubular turbine --- fish farm --- performance test --- design factors --- optimum model --- the mixed free-surface-pressurized flow --- characteristic implicit method --- relative roughness --- vent holes --- optimization control --- microchannel heat sink --- wavy microchannel --- groove --- heat transfer performance --- laminar flow --- multi-objective optimization --- LHS --- full factorial methods --- pump-turbine --- dynamic stress --- start-up process --- vortex generator (VG) --- computational fluid dynamics (CFD) --- cell-set model --- RANS --- LES --- multistage centrifugal pump --- double-suction impeller --- twin-volute --- inducer-type guide vane --- trailing edge flap (TEF) --- trailing edge flap with Micro-Tab --- deflection angle of the flap (αF)