Dissertations / Theses on the topic 'Turbomachinery measurements'
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Gahagan, Shane G. "Pressure-sensitive paint measurements on a rotor disk surface at high speeds." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333428.
Full textThesis advisor, Raymond P. Shreeve. AD-A333 428. Includes bibliographical references (p. 49-50). Also available online.
Udrea, Doina Daciana. "High accuracy flow velocity measurements using particle image velocimetry : development and applications." Thesis, University of Warwick, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300743.
Full textMansour, Michel. "A 48kHz bandwidth, 1.8mm diameter entropy probe for aerothermal loss measurements in turbomachinery flows /." Zürich : ETH, 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18087.
Full textFlegel, Ashlie Brynn. "Aerodynamic Measurements of a Variable-Speed Power-Turbine Blade Section in a Transonic Turbine Cascade." Cleveland State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=csu1387437733.
Full textCelestina, Richard A. "Development of New Single and High-Density Heat Flux Gauges for Unsteady Heat Transfer Measurements in a Rotating Transonic Turbine." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1608551902273547.
Full textAppukuttan, Ajith. "Probe measurement errors in turbomachinery flows." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613303.
Full textJaffa, Nicholas Andrew. "Unsteady measurement techniques for turbomachinery flows." Thesis, University of Notre Dame, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3732212.
Full textAccurate unsteady measurements are required for studying the flows in high speed turbomachines, which rely on the interaction between rotating and stationary components. Using statistics of phase locked ensembles simplifies the problem, but accurate frequency response in the 10-100 kHz range significantly limits the applicable techniques. This research advances the state of the art for phase resolved measurement techniques using for high speed turbomachinery flows focusing on the following areas: development, validation, and uncertainty quantification. Four methods were developed and implemented: an unsteady total pressure probe, the multiple overheat hot-wire method, the slanted hot-wire method, and the phase peak yaw hot-wire method. These methods allow for the entire phase locked average flow field to be measured (temperature, pressure, and velocity components, swirl angle, etc.). No trusted reference measurement or representative canonical flow exists for comparison of the phase resolved quantities, making validation challenging. Five different validation exercises were performed to increase the confidence and explore the range of applicability. These exercises relied on checking for consistency with expected flow features, comparing independent measurements, and cross validation with CFD. The combined uncertainties for the measurements were quantified using uncertainty estimates from investigations into the elemental error sources. The frequency response uncertainty of constant temperature hot-wire system was investigated using a novel method of illuminating the wire with a laser pulse. The uncertainty analysis provided estimates for the uncertainty in the measurements as well as showing the sensitivity to various sources of error.
Quinn, Kevin J. "Pressure-sensitive paint measurement technique development for turbomachinery application." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA346041.
Full text"December 1997." Thesis advisor(s): Raymond P. Shreeve. Includes bibliographical references (p. 83-84). Also available online.
Navarra, Kelly R. "Development of the Pressure-Sensitive-Paint Technique for Advanced Turbomachinery Applications." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36840.
Full textMaster of Science
Pickering, Todd Michael. "Methods for Validation of a Turbomachinery Rotor Blade Tip Timing System." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/47496.
Full textMaster of Science
Crowther, Shamal Mena. "The development of a fast response measurement system for use in turbomachinery applications." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/51044/.
Full textBrouckaert, Jean-François M. "Development of fast response aerodynamic probes for time-resolved measurements in turbomachines." Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211406.
Full textLee, Wing Kai. "The application of 2D and 3D particle image velocimetry (PIV) for measurement in high speed flows." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343141.
Full textLomenzo, Richard Allan Jr. "Static Misalignment Effects is a Self-Tracking Laser Vibrometry System for Rotating Bladed Disks." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/29398.
Full textPh. D.
Gupta, Ajay K. "Development of a new shock capturing formula for pressure correction methods." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12172008-063732/.
Full textNewman, Timothy James. "Towards a silent fan : an investigation of low-speed fan aeroacoustics." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/251318.
Full textDeveaux, Benjamin. "Analyse et contrôle de l'écoulement de jeu d'une aube fixe isolée." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE009.
Full textThis study aims at providing a detailed description of the tip-leakage flow, in order to analyzeits sensitivity to design parameters and to control devices based on air injection from the casing. The setup iscomposed of a single blade, set orthogonal to a flat plate that plays the role of the casing wall. The analysis isbased on experiments conducted in a low-speed wind tunnel that are complemented by CFD calculations. Thetip-leakage flow is primarily driven by the gap height. The incoming boundary layer thickness and the bladeloading also have a notable effect on the lateral position of the tip-leakage vortex. The distribution of local entropycreation rate has been used to identify areas of losses in the flow. Moreover, the total pressure losses have beendecomposed in two terms identified as a vortex loss and a wake loss. This vortex loss drives the increase of totalpressure losses with the gap height. An empirical model has been developped to predict the evolution of thetip-leakage vortex circulation and of the total pressure losses with respect to the gap height. A steady injection ofair from the casing has been evaluated, using normal jets in the gap. With this control strategy, the tip-leakagevortex tends to be closer to the blade, which could lead to an extension of the range of stable operation for axialcompressors. In addition to that, the control device smoothes out the axial vorticity field in the tip-leakage vortex,which could be interesting to reduce rotor-stator interactions. However, this control strategy leads to higher totalpressure losses and is less effective with larger gaps
Guérin, Nicolas. "Analyse thermomécanique du contact aube-stator : approches numérique et expérimentale." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC043.
Full textThe constant need for efficiency and lightweightness of aeroengines demands OEM continued efforts to open design domain. In particular, operations clearances between static and rotating parts of modern engines become narrower, leading to better efficiencies. However, lighter components generally have lower stiffnesses, causing a growth in dynamic phenomena participation in the engines life-cycle. Mutli-physics coupling effects are aggravated in the same manner, whether they are of thermomechanical or aeroelastic nature. In this context, it is therefore crucial to improve design tools so as to predict more accurately the operational conditions of the engine components, with a general objective to cut down development and operational costs, while ensuring engine reliability and passenger safety. This thesis closely follows previous work on blade–casing contacts, all aimed at modelling more accurately the underlying more and more complex phenomena and structures. The main objective of this work has been to introduce a model for the thermal phenomena occurring during contacts at the interface between rotating and static parts, based on industrial geometries of components, which are set in a test rig. Due to the sophistication of the parts, the addition of these phenomena in the model had to be performed while paying attention to high simulation constraints. In other words, a trade-off had to be found between speed and precision of the computations. Finally a correlation phase was to be performed between simulations and experimental trials was to be performed to assess the relevance of the proposed numerical tools. During this thesis, a modification and a new instrumentation of the CASTOR test rig were performed. Multiple contact trials were carried out, during which vibratory and thermal behavior of the components were measured. In parallel to these experimental operations, multiple numerical developments were tackled. Among them, a model reduction methodology of thermoelastic models of turbo-engine centrifugal compressors was developed. Also, multiple time-stepping procedures, originally dedicated to solve contact problems in a purely mechanical context, we extended to perform thermomechanical computations. Several complications were removed taking advantage of advanced methods stemming from the non-smooth dynamics community. Eventually, simulations were performed with diverse setups to both show the capabilities of the numerical tool as well as confront numerical results and experimental observations
Courtiade, Nicolas. "Experimental analysis of the unsteady flow and instabilities in a high-speed multistage compressor." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00838695.
Full textVincent, Julien. "Étude expérimentale des interactions aube-abradable à très grandes vitesses : influence du matériau et de sa microstructure." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0334.
Full textThe turbofan efficiency can be improved by minimizing the blade-casing gap, thus reducing the aerodynamic loss. The reduced gap conduces to contact risk between the high-speed rotating blades and the engine case. Sacrificial materials, called abradable materials, are deposited on the casing to limit the damage caused by these contacts. These interactions involve a lot of damage mechanisms, which can be adverse or beneficial to the proper performance of the abradable seal and to the reliability of the engine. The aim of this thesis is to understand, predict and quantify the different damages and the interaction forces associated for abradable materials obtained with different process parameters. A triaxial dynamometer was developed to reproduce the local high-speed interactions (50 – 300 m/s) between the blade tip and the abradable material during transitional phases. The interaction forces measurement during short-lived contacts (300 µs – 1 ms) requires a large bandwidth. A correction method based on experimental modal analysis was implemented to extend the natural bandwidth of the device and attenuate the crosstalk between the different measurement channels. The damage mechanisms of abradable materials were studied by post-mortem analysis and correlated to the interaction forces and velocity
O'Dowd, Devin Owen. "Aero-thermal performance of transonic high-pressure turbine blade tips." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:e7b8e7d0-4973-4757-b4df-415723e7562f.
Full textGwashavanhu, Benjamin. "Evaluation of optical techniques applied to online turbomachinery blade vibration measurements." Diss., 2015. http://hdl.handle.net/2263/50912.
Full textDissertation (MEng)--University of Pretoria, 2015.
tm2015
Mechanical and Aeronautical Engineering
MEng
Unrestricted
Chen, Jian Yu, and 陳建宇. "Study of the Tip Clearance and Dynamical Measurements for Turbomachinery Using Non-contact Probes." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/94253174346165328725.
Full text國立中興大學
機械工程學系
91
Abstract This study sets up a non-contact measurement system with light probes for revealing vibration characteristics of rotor blades by using blade tip clearance. The two-parameter method in conjunction with measurements on a small fan is studied. The study finds an analytical relationship for the two-parameter method based on the linear vibration equation. This analytical result describes the relation between axis ratio of the blade dynamic ellipse and phase difference of the probes. The speed of fan is in the range from 800 to 2500 rpm for the measurements of the tip clearance for dynamic analysis of the blade vibrations. Experiments include the one-probe method and two-probe method. The one-probe method measures vibration of an arbitrary blade with one probe located at a fixed position on the casing. Its purpose is to identify the resonant frequency and resonant amplitude of blade vibration. The two-probe method employs two probes located with an appropriate spacing on the casing. Blade displacements measured by two probes under different rotor speed are found. The application of two-parameter method is discussed by comparing with the results of experiment and simulation. Finally, the blade vibration involving rotor speed drifting is studied by simulation. In this simulation, the amplitude and the frequency of disturbance on rotor speed for blade vibration are discussed. Key words: non-contact measurement, light probes, blade tip clearance, blade dynamic mode.
Oberholster, Abraham Johannes. "The application of Eulerian laser Doppler vibrometry to the on-line condition monitoring of axial-flow turbomachinery blades." Thesis, 2010. http://hdl.handle.net/2263/25794.
Full textThesis (PhD)--University of Pretoria, 2010.
Mechanical and Aeronautical Engineering
unrestricted
Chirathadam, Thomas A. "Measurements of Drag Torque and Lift Off Speed and Identification of Stiffness and Damping in a Metal Mesh Foil Bearing." Thesis, 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7350.
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