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Dissertations / Theses on the topic 'Air flow in a stairwell model'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Zohrabian, Alfred Sorooshkani. "An experimental and theoretical study of buoyancy driven air-flow in a half-scale stairwell model." Thesis, Brunel University, 1989. http://bura.brunel.ac.uk/handle/2438/5349.

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The buoyancy-driven air flow and the associated energy transfer within a half-scale stairwell model have been investigated experimentally and theoretically. The experimental work comprised the larger part of the investigation. The stairwell model consisted of a lower and an upper compartment connected through the stairway. The recirculation of air was maintained by a continuous supply of heat in the lower compartment. Two different cases, referred to as closed and open non-sloping ceiling stairwells, were considered. In the former, the stairwell formed a closed system, and in the latter situat

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2

Ergin-Oezkan, Selma. "Measurements and numerical modelling of natural convection in a stairwell model." Thesis, Brunel University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316944.

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3

Paonessa, Michael E. (Michael Edward) 1979. "A model for predicting air flow during in-situ air sparging." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/85753.

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4

Nangunoori, Chetan Kumar, and Bhaskar Ravichandra Kumar Kumar. "Parametric Ram Air Channel Model for Flow Optimization." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80069.

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Ram air channel or NACA channel is used to direct the ambient air for various purposes in an aircraft, such as pressurizing the cabin or as a coolant to heat exchangers and even more other applications like a cooling of the coolant. It is designed; such that it supplies the required amount of ambient air for various operations as mentioned, even aero-dynamical features should be taken into consideration while designing. In past, the developed prototypes are to be designed first and then experimented to optimize the design which gives accurate predictions and makes easy to understand the phenom

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5

Menon, Anilkumar S. "Flow dynamics in a model of the large airways." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72009.

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Oscillatory velocity profiles and the pressure-flow relationship were measured in a 3:1 scale rigid model of the human central airways. A reciprocating pump provided flows with frequencies of 0.25, 1, 2 and 4 Hz and tidal volumes of 300, 500 and 1500 mL giving tracheal Womersley numbers up to 31 and peak tracheal Reynolds numbers up to 17000. A hot wire anemometer was used to measure velocities along two perpendicular diameters (one in the plane of the model and the other in the plane perpendicular to the model) at 10 stations distributed through the model. Velocities were also measured with a

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6

El, Moueddeb Khaled. "Principles of energy and momentum conservation to analyze and model air flow for perforated ventilation ducts." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=42024.

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A theoretical model was developed to predict the air distribution pattern and thus to design perforated ventilation ducts equipped with a fan. The analysis of the air distribution pattern of such systems requires accurate measurement procedures. Several experimental methods were tested and compared. Accordingly, the piezometric flush taps and thermo-anemometer were selected to measure respectively the duct air pressure and the outlet air flow.<br>Based on the equations of energy and momentum conservation, a model was formulated to predict the air flow performance of perforated ventilation duct

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7

Marzuoli, Aude Claire. "En-route air traffic optimization under nominal and perturbed conditions, on a 3D data-based network flow model." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43639.

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Air Traffic Management (ATM) aims at ensuring safe and efficient movement of aircraft in the airspace. The National Airspace System is currently undergoing a comprehensive overhaul known as NextGen. With the predicted growth of air transportation, providing traffic flow managers with the tools to support decision making is essential. These tools should aid in accommodating the air traffic throughput increase, while limiting controller workload and ensuring high safety levels. In the National Airspace System (NAS), the goal of en-route Traffic Flow Management (TFM) is to balance air traffic dem

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8

Mously, Khalid Ahmad. "Numerical modeling of PO-218 deposition in a physiologically realistic lung bifurcation model /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9842554.

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9

Lazim, Mohamad Alias. "Econometric forecasting models and model evaluation : a case study of air passenger traffic flow." Thesis, Lancaster University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296880.

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10

Pereira, J. C. "Laryngeal source excitation modelling." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380630.

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11

Chief, Karletta. "Soil Air Permeability and Saturated Hydraulic Conductivity: Development of Soil Corer Air Permeameter, Post-fire Soil Physical Changes, and 3D Air Flow Model in Anisotropic Soils." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195482.

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Air permeability (ka) is a viable alternative to water- and texture-based methods to rapidly map saturated hydraulic conductivity (Ksat). The ability to measure this important hydraulic property without the use of more cumbersome and time-consuming methods may provide a practical approach to generate more complete data to describe hydrologic conditions. This study presents the development of an air permeameter which is suitable for desert soils. The Soil Corer Air Permeameter (SCAP) is compatible with a standard soil corer and employs digital components to measure flowrates under low-pressur

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12

Tough, M. C. "A heat transfer model of forced convection, cross flow heat exchangers used in space heating." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259171.

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13

El, Moueddeb Khaled. "Principles of energy and momentum conservation to analyze and model air flow for perforated ventilation ducts." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ29929.pdf.

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14

Teng, Penghua. "CFD MODELLING OF TWO-PHASE FLOWS AT SPILLWAY AERATORS." Licentiate thesis, KTH, Vattendragsteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202392.

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Due to the high-speed flow in a chute spillway, cavitation damages often occur. This undesired phenomenon threatens the safety of the structure. For the purpose of eliminating the damages, an aerator is often installed in the spillway. To understand its characteristics, physical model tests are a popular method. To complement the model tests, computation fluid dynamics (CFD) simulations are used to study aerator flows. To represent the two-phase flows, multiphase models should be employed. This thesis examines two of them, namely, the Volume-Of-Fluid model (VOF) and Two-Fluid model. Based on t

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15

Tian, Zhaofeng, and rmit tian@gmail com. "Numerical Modelling of Turbulent Gas-Particle Flow and Its Applications." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080528.150211.

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The aim of this thesis is three-fold: i) to investigate the performance of both the Eulerian-Lagrangian model and the Eulerian-Eulerian model to simulate the turbulent gas-particle flow; ii) to investigate the indoor airflows and contaminant particle flows using the Eulerian-Lagrangian model; iii) to develop and validate particle-wall collision models and a wall roughness model for the Eulerian-Lagrangian model and to utilize these models to investigate the effects of wall roughness on the particle flows. Firstly, the Eulerian-Lagrangian model in the software package FLUENT (FLUENT Inc.)

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16

Vos, Adele. "Unsteady flow conditions at dam bottom outlet works due to air entrainment during gate closure : Berg River dam model." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71850.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: A trial closure of the emergency gate of the Berg River Dam was undertaken by the Trans- Caledon Tunnel Authority (TCTA) on 12 June 2008. The air vent downstream of the emergency gate was designed to introduce air to mitigate the negative pressures that were expected in the conduit during emergency gate operations. The emergency gate has to close when the radial gate at the downstream end of the outlet conduit fails. Contrary to the theoretical design, the measured air vent velocities in the field indicated that, while the

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17

Demay, Charles. "Modélisation et simulation d'écoulements transitoires diphasiques eau-air dans les circuits hydrauliques." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAM100/document.

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Ce travail est consacré à la modélisation mathématique et numérique des écoulements eau-air en conduite qui interviennent notamment dans les centrales de production d’électricité ou les réseaux d’eaux usées. On s’intéresse particulièrement aux écoulements mixtes caractérisés par la présence de régimes stratifiés pilotés par des ondes gravitaires lentes, de régimes en charge ou secs (conduite remplie d’eau ou d’air) pilotés par des ondes acoustiques rapides, et de poches d’air piégées. Une modélisation précise de ces écoulements est nécessaire afin de garantir le bon fonctionnement du circuit h

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18

Liu, Ting. "Air-pocket transport in conjunction with bottom-outlet conduits for dams." Licentiate thesis, KTH, Vattendragsteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-52727.

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Undesired air entrainment in bottom outlet conduits of dams may cause pressure transients, leading to conduit vibrations, blowback, discharge pulsation and even cavitation, and jeopardize the operational safety. Due to design limitations or construction costs, it is impossible to create an air free environment in a pressurized pipe. Therefore, it is essential to understand the air transport in enclosed pipes in order to provide guidance in bottom outlet design and operation. The commonly used criterion of the air-pocket movement in pipe flow is the water flow velocity for starting moving an ai

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19

Chlup, Jaroslav. "Model proudění chladicího média v synchronním stroji." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218581.

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This project deals with simulation´s possibilities of air flow in electric machines. A finite element method is the final element technique. Aim of this project is conversion universal formula for calculation friction dissipation factor. For its location is necessary to create 27 simulations according to the 2. plan order. Usage programme MATLAB for processing results obtain requisite algorithm for calculation friction dissipation factor.

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20

Lundström, Robin. "Machine Learning for Air Flow Characterization : An application of Theory-Guided Data Science for Air Fow characterization in an Industrial Foundry." Thesis, Karlstads universitet, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-72782.

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In industrial environments, operators are exposed to polluted air which after constant exposure can cause irreversible lethal diseases such as lung cancer. The current air monitoring techniques are carried out sparely in either a single day annually or at few measurement positions for a few days.In this thesis a theory-guided data science (TGDS) model is presented. This hybrid model combines a steady state Computational Fluid Dynamics (CFD) model with a machine learning model. Both the CFD model and the machine learning algorithm was developed in Matlab. The CFD model serves as a basis for the

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21

Murki, Sai Rohith, and Yaswanth Puttagunta. "CFD Simulation of an Activated Carbon Filter." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13839.

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In various industries, specialized filters with activated carbon are used for adsorbing mercury from air-flows. MRT has eight such Activated CarbonFilters (ACFs) in one of their devices. The main purpose of research is tostudy the flow in the ACF filter and suggest a mathematical model for the complete system through which an improved design can be found.Simulation of a single ACF illustrates how the current system’s air flow does not cover the whole filter leaving part of the carbon bed unused forthe adsorption. This is validated by experimental data. A theoretical studybased on a mathematica

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22

Boháček, Jan. "EFFECT OF FLOW PARAMETERS OF WATER AND AIR ATOMIZED SPRAYS ON COOLING INTENSITY OF HOT SURFACES." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-233959.

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Práce komplexně popisuje vodní a vodovzdušné chlazení pomocí metod CFD (Computational Fluid Dynamics) konkrétně s využitím software ANSYS FLUENT. Skládá se ze dvou hlavních částí, z nichž první se zabývá numerickým popisem jediné vodní kapky a druhá popisem směsí kapek představující paprsek válcové a ploché trysky. Je založena převážně na vícefázových modelech proudění a vlastních uživatelsky definovaných funkcí (User Defined Functions, UDF) představujících stěžejní část práce. Uvedené výpočtové modely jsou ve většině případů verifikovány pomocí experimentálních dat nebo jiných numerických mod

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23

Luňák, Pavel. "Numerický model zavzdušňovacího ventilu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318132.

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This diploma thesis deals the formation of water hammer in pipes and the suppress the nega-tive effects especially for the use of protective devices (surge tank, air chamber, air valve and other). The special attention is paid to the use of the air valve, for which it was developed mathematical model. The solution is based on the use of numerical methods Lax-Wendroff with boundary conditions for the air valve.The numerical results are confronted with the ex-periment in conclusion.

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24

Chibwe, Deside Kudzai. "Flow behavior, mixing and mass transfer in a Peirce-Smith converter using physical model and computational fluid dynamics." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6798.

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25

Scussiato, Talita. "Estudo do fluxo de ar em solos usando a técnica de injeção de ar em modelos físicos bidimensionais." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3145/tde-11062013-105342/.

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O método de injeção de ar é utilizado para a descontaminação de solos e lençóis freáticos contaminados com Compostos Orgânicos Voláteis (VOCs). O ar injetado no solo na zona saturada, ao subir para a zona não saturada, volatiliza os contaminantes. A eficiência da remediação por esse método está diretamente ligada à região de solo em que ocorre o fluxo de ar. Essa região é denominada de zona de influência e é afetada por vários fatores tais como: tipo e estrutura do solo, permeabilidade e pressão de injeção. No presente trabalho foram realizados estudos de fluxo de ar em solos saturados em um m

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26

Powell, James Eckhardt. "Building a Multivariable Linear Regression Model of On-road Traffic for Creation of High Resolution Emission Inventories." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3415.

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Emissions inventories are an important tool, often built by governments, and used to manage emissions. To build an inventory of urban CO2 emissions and other fossil fuel combustion products in the urban atmosphere, an inventory of on-road traffic is required. In particular, a high resolution inventory is necessary to capture the local characteristics of transport emissions. These emissions vary widely due to the local nature of the fleet, fuel, and roads. Here we show a new model of ADT for the Portland, OR metropolitan region. The backbone is traffic counter recordings made by the Portland Bu

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27

Khan, Muhammad Alam Z. "Transient engine model for calibration using two-stage regression approach." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8456.

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Engine mapping is the process of empirically modelling engine behaviour as a function of adjustable engine parameters, predicting the output of the engine. The aim is to calibrate the electronic engine controller to meet decreasing emission requirements and increasing fuel economy demands. Modern engines have an increasing number of control parameters that are having a dramatic impact on time and e ort required to obtain optimal engine calibrations. These are further complicated due to transient engine operating mode. A new model-based transient calibration method has been built on the applica

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28

Cachard, François. "Etude théorique et expérimentale des instabilités des systèmes de pompage par air-lift." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0107.

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29

Deng, Tian. "LES combined with statistical models of spray formation closely to air-blast atomizer." Thesis, Ecully, Ecole centrale de Lyon, 2011. http://www.theses.fr/2011ECDL0037/document.

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Cette thèse présente une extension de l'approche stochastique de l'atomisation primaire de type air assisté près d'un injecteur. Cette approche avait déjà été introduite dans les publications de Gorokhovski et al. Dans le cadre de la simulation des grandes échelles, la zone d'atomisation primaire est simulée comme un corps immergé avec une structure stochastique. Ce dernier est défini par la simulation stochastique de la position et de la courbure de l'interface entre le liquide et le gaz. La simulation de la position de l'interface est basée sur l'hypothèse de symétrie d'échelle pour la fragm

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30

Janáčková, Lada. "Vizualizace a optická měření vnitřního a vnějšího dvoufázového proudění u tlakových vířivých trysek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378277.

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Tato práce se zabývá studií Simplex a SR verze původní trysky používané ve spalovací komoře malého proudového motoru. Pro lepší porozumění procesu rozprašování byl vyroben transparentní model obou trysek v měřítku 10:1. Tvorba spreje u tlakové vířivé trysky je komplexní proces dvoufázového proudění. Vnitřní a vnější proudění bylo zkoumáno pomocí Laserového Dopplerovského Anemometru a vysokorychlostní kamery při vstupních tlacích p = 0.5, 1.0 a 1.5 MPa s použitím kerosinu a p-Cymenu. Z hlediska vnitřního proudění byla provedena charakteristika vzdušného jádra a zkoumán vliv různých SFR hodnot n

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31

Guilbaud, Claude. "Étude des inversions thermiques : application aux écoulements atmospghériques dans des vallées encaissées." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10068.

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Le code Submeso est développé dans le but de comprendre et d'analyser les phénomènes d'inversion thermique dans les vallées encaissées. Les grandes échelles de l'écoulement (LES) sont obtenues par la résolution des équations tridimensionnelles du mouvement écrites sous leur forme compressible et non-hydrostatique en coordonnées dites gal-chen. Un modèle sous-maillé basé sur une équation de transport de l'énergie cinétique turbulente permet de transférer la production d'énergie turbulente générée au sol vers les couches supérieures de l'atmosphère. Les échanges entre le sol et l'atmosphère sont

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32

Joerger, Guillaume. "Multiscale modeling and event tracking wireless technologies to improve efficiency and safety of the surgical flow in an OR suite." Thesis, La Rochelle, 2017. http://www.theses.fr/2017LAROS009/document.

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Améliorer la gestion et l’organisation des blocs opératoires est une tâche critique dans les hôpitaux modernes, principalement à cause de la diversité et l’urgence des activités impliquées. Contrairement à l’aviation civile, qui a su optimiser organisation et sécurité, le management de bloc opératoire est plus délicat. Le travail ici présenté abouti au développement et à l’installation de nouvelles technologies assistées par ordinateur résolvant les problèmes quotidiens des blocs opératoires. La plupart des systèmes existants modélisent le flux chirurgical et sont utilisés seulement pour plani

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33

Ferragh, Omar. "Etude du transfert de chaleur et de masse dans un écoulement d'air entre deux plaques parallèles en présence d'un ruissellement d'eau : Application aux réfrigérants industriels." Valenciennes, 1995. https://ged.uphf.fr/nuxeo/site/esupversions/4aad8950-0f32-46d7-9276-1f08fd498651.

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L'étude consiste a analyser les échanges thermiques et massiques découlant d'une évaporation par convection forcée, entre deux plaques parallèles en présence d'un ruissellement d'eau. L'étude est entreprise sous ses deux aspects: théorique et expérimental. La modélisation est basée sur les théories des couches limites dynamique et thermique couplées avec les concepts de transport de masse, au sein du fluide en écoulement, pour un régime de couches limites laminaires. Le couplage des deux problèmes thermique et massique est réalisé par l'intermédiaire des conditions à l'interface eau-air. Suite

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34

Zein, Waël. "Etude d'un capteur absorbant l'energie solaire par le fluide caloporteur : application au chauffage des piscines de plein-air." Poitiers, 1986. http://www.theses.fr/1986POIT2289.

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Modelisation des transferts radiatifs pour les differents composants du capteur. Resolution numerique des equations permettant d'obtenir les lois d'evolution des performances du capteur en fonction de ces caracteristiques geometriques, des conditions radiatives et meteorologiques d'un site. Verification experimentale a l'aide d'un simulateur de rayonnement. Application envisagee, au chauffage d'une piscine en plein-air. Optimisation des conditions de fonctionnement et analyse economique du systeme de chauffage

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Turlat, Christine. "Etude sur maquette de la convection naturelle dans l'habitat par interferometrie holographique : determination des regimes d'ecoulements parietaux." Toulouse 3, 1987. http://www.theses.fr/1987TOU30018.

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Etude du transfert de chaleur et des regimes d'ecoulement d'un local avec une paroi chauffee, une paroi opposee froide, et les quatres autres paroi isothermes. Resultats d'une maquette a l'echelle 1/4

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36

Hayati, Abolfazl. "Natural Ventilation and Air Infiltration in Large Single‑Zone Buildings : Measurements and Modelling with Reference to Historical Churches." Doctoral thesis, Högskolan i Gävle, Energisystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24612.

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Natural ventilation is the dominating ventilation process in ancient buildings like churches, and also in most domestic buildings in Sweden and in the rest of the world. These buildings are naturally ventilated via air infiltration and airing. Air infiltration is the airflow through adventitious leakages in the building envelope, while airing is the intentional air exchange through large openings like windows and doors. Airing can in turn be performed either as single-sided (one opening) or as cross flow ventilation (two or more openings located on different walls). The total air exchange affe

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37

Sattari, Amir. "Investigations of Flow Patterns in Ventilated Rooms Using Particle Image Velocimetry : Applications in a Scaled Room with Rapidly Varying Inflow and over a Wall-Mounted Radiator." Doctoral thesis, KTH, Installations- och energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167804.

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This thesis introduces and describes a new experimental setup for examining the effects of pulsating inflow to a ventilated enclosure. The study aimed to test the hypothesis that a pulsating inflow has potential to improve ventilation quality by reducing the stagnation zones through enhanced mixing. The experimental setup, which was a small-scale, two-dimensional (2D), water-filled room model, was successfully designed and manufactured to be able to capture two-dimensional velocity vectors of the entire field using Particle Image Velocimetry (PIV). Using in-house software, it was possible to c

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38

Delvadia, Renishkumar. "In vitro methods to predict aerosol drug deposition in normal adults." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/314.

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This research was aimed at the development and validation of new in vitro methods capable of predicting in vivo drug deposition from dry powder inhalers, DPIs, in lung-normal human adults. Three physical models of the mouth, throat and upper airways, MT-TB, were designed and validated using the anatomical literature. Small, medium and large versions were constructed to cover approximately 95% of the variation seen in normal adult humans of both genders. The models were housed in an artificial thorax and used for in vitro testing of drug deposition from Budelin Novolizer DPIs using a breath

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39

Gai, Guodong. "Modeling of water sprays effects on premixed hydrogen-air explosion, turbulence and shock waves Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray Numerical study on laminar flame velocity of hydrogen-air combustion under water spray effects Modeling of particle cloud dispersion in compressible gas flows with shock waves A new formulation of a spray dispersion model for particle/droplet-laden flows subjected to shock waves Particles-induced turbulence: a critical review of physical concepts, numerical modelings and experimental investigation A new methodology for modeling turbulence induced 1 by a particle-laden flow using a mechanistic model." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR14.

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Cette thèse de doctorat est dédiée au développement de modèles physiques pour l’étude des systèmes d’aspersion de gouttelettes d’eau en milieu réactif d’hydrogène-air pré-mélangée dans les centrales nucléaires. Des modèles d’ordre réduit sont développés pour décrire l’évaporation des gouttelettes d’eau dans la flamme, la dispersion des nuages de particules après le passage des ondes de choc et l’évolution de l’échelle caractéristiques de turbulence avec la présence d’un jet d’eau. Une nouvelle méthodologie est proposée pour évaluer les effets de l’évaporation par l’aspersion sur la propagation

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Rubensdörffer, Frank G. "Numerical and Experimental Investigations of Design Parameters Defining Gas Turbine Nozzle Guide Vane Endwall Heat Transfer." Doctoral thesis, KTH, Energiteknik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3884.

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The primary requirements for a modern industrial gas turbine consist of a continuous trend of an increasing efficiency combined with very low emissions in a robust, cost-effective manner. To fulfil these tasks a high turbine inlet temperature together with advanced dry low NOX combustion chambers are employed. These dry low NOX combustion chambers generate a rather flat temperature profile compared to previous generation gas turbines, which have a rather parabolic temperature profile before the nozzle guide vane. This means that the nozzle guide vane endwall heat load for modern gas turbines i

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Lafaye, de Micheaux Téo. "Modélisation des écoulements d’air et des transferts de chaleur dans un camion frigorifique : Etude des performances d’un dispositif de rideau d’air innovant pour le maintien de la chaîne du froid et la réduction des pertes à l’ouverture des portes." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI057.

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La préservation de la chaîne du froid est un paramètre particulièrement important dans le cadre de la distribution urbaine, où les fréquentes ouvertures de portes induisent une charge thermique d’infiltration. Afin de réduire les transferts de masse et de chaleur et de protéger l’ouverture, des rideaux d’air ont récemment été installés au niveau de l’ouverture des camions frigorifiques. L’objet de la présente étude est d’étudier ce type confinement. Deux modèles CFD ont été développés pour simuler les champs de températures et de vitesses dans un camion réfrigéré clos. Ils ont permis de montre

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Costini, Pierre. "Applicabilité de la réduction de modèles à la conception aérothermique collaborative des systèmes d'air secondaire des turbomachines." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0109.

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Une méthode non intrusive de construction d’un modèle de remplacement de l’écoulement dans une cavité de système d’air secondaire de turboréacteur est recherchée. Le modèle réduit doit pouvoir être intégré dans un modèle de l’ensemble du moteur et couplé à la thermique de la structure pour simuler son comportement thermique sur une mission complète sous aile. Pour cela, il doit prendre un grand nombre de paramètres en entrée, retourner autant de sorties et être utilisable sur des intervalles de variations étendus de ces paramètres. Plusieurs approches sont envisagées et implémentées, puis appl

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Thibaud, Laurent. "Contribution à l'étude de la convection naturelle à l'intérieur d'un cylindre vertical poreux soumis à une densité de flux thermique parietal constante : application aux silos à grains." Poitiers, 1988. http://www.theses.fr/1988POIT2299.

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"Flow Field in a Single-Stage Model Air Turbine With Seal Rings and Pre-Swirled Purge Flow." Master's thesis, 2010. http://hdl.handle.net/2286/R.I.8682.

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abstract: Modern gas turbines operate at high mainstream gas temperatures and pressures, which requires high durability materials. A method of preventing these hot gases from leaking into the turbine cavities is essential for improved reliability and cost reduction. Utilizing bleed-off air from the compressor to cool internal components has been a common solution, but at the cost of decreasing turbine performance. The present work thoroughly describes the complex flow field between the mainstream gas and a single rotor-stator disk cavity, and mechanisms of mainstream gas ingestion. A combined

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Chih-HsiangTsao and 曹智翔. "Time-Based Separation for Air Traffic Control Using Danger Value Distribution Flow Model." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/83295180065843389035.

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碩士<br>國立成功大學<br>民航研究所<br>98<br>This paper proposes a time-based flow model using the modified LWR highway model. This model treats each aircraft as a continuum in the flow. Instead of using density distribution, a distribution of air collision probability, the danger value distribution (DVD), is used to represent each aircraft. The closer the distance to the aircraft, the higher the danger value is. Since an aircraft passes through wider space under faster speed in a fixed time period, the faster the aircraft the wider the danger value distribution will be. This concept is the same as the prot

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Tostão, Ana Luísa Oliveira. "Single channel model for flow and heat transfer in high temperature solar volumetric air receiver." Master's thesis, 2015. http://hdl.handle.net/10451/18024.

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Tese de mestrado integrado em Engenharia da Energia e do Ambiente, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2015<br>Numa primeira abordagem, esta tese apresenta um estado da arte sobre as Centrais de Concentração Solar em geral, e posteriormente é feita uma descrição sobre a tecnologia de receptor solar de ar focando-se nas principais características, parâmetros e desenvolvimentos. Esta tese apresenta também um modelo para um receptor solar de ar de alta temperatura modelado no software de simulação, COMSOL Multiphysics ® usando Carbeto de Silício e ar como os

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Su, Shang-Ming, and 蘇上銘. "The Development of System Dynamics Model for Dioxin Flow and the Co-benefits of Air Pollutants Reduction." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/3c8y5n.

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碩士<br>國立臺北科技大學<br>環境工程與管理研究所<br>101<br>This study used system dynamics software STELLA to develop a system dynamics model for dioxin flow, to estimate past and future trend dioxin level in each environment media. More than 95% of human exposure is through food intakes, so we simulated the dioxin level in each kind of foods and estimated the dioxin concentration in body blood, to calculate life time average daily dose (LADD) for human exposure. In addition , we also compared STELLA and RAIDAR model with measurement value and the error percentage between each other was approximately 63.92% and 4

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"Experimental Study of Main Gas Ingestion and Purge Gas Egress Flow in Model Gas Turbine Stages." Master's thesis, 2010. http://hdl.handle.net/2286/R.I.8727.

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abstract: Efficient performance of gas turbines depends, among several parameters, on the mainstream gas entry temperature. At the same time, transport of this high temperature gas into the rotor-stator cavities of turbine stages affects the durability of rotor disks. This transport is usually countered by installing seals on the rotor and stator disk rims and by pressurizing the cavities by injecting air (purge gas) bled from the compressor discharge. The configuration of the rim seals influences the magnitude of main gas ingestion as well as the interaction of the purge gas with the main gas

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Nichols, Andrew, Simon J. Tait, Kirill V. Horoshenkov, and Simon J. Shepherd. "A model of the free surface dynamics of shallow turbulent flows." 2016. http://hdl.handle.net/10454/8942.

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Yes<br>Understanding the dynamic free surface of geophysical flows has the potential to enable direct inference of the flow properties based on measurements of the free surface. An important step is to understand the inherent response of free surfaces in depth-limited flows. Here a model is presented to demonstrate that free surface oscillatory spatial correlation patterns result from individual surface features oscillating vertically as they advect over space and time. Comparison with laboratory observations shows that these oscillating surface features can be unambiguously explained by simpl

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Shih, Yi-Hsuan, and 施怡瑄. "The Development of System Dynamics Model for Mercury Flow and the Simulation of the Co-benefits of Air Pollutants Reduction on the Energy Sector in Taiwan." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/tvtmcp.

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碩士<br>國立臺北科技大學<br>環境工程與管理研究所<br>99<br>Although there have been studies about mercury levels in environmental media—atmosphere, freshwater, rainwater, soil, and sediment et al.—an integrating model for health risk assessment and a cost-benefit analysis for the mercury reduction policy were still pending. The objective of this study was to develop a system dynamics model for mercury flow and human mercury exposure in Taiwan’s exclusive economic zone. The average methylmercury intake rate of Taiwanese adults was estimated to be 12.72 μg/day, which would cause an increment of 2.16 ppm on adult Tai

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