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Dissertations / Theses on the topic 'Jet flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 September 2023

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1

Miller, Adam Cole. "Flow control via synthetic jet actuation." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1409.

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An experimental investigation was undertaken to determine the ability of Synthetic Jet Actuators to control the aerodynamic properties of a wing. The Synthetic Jet Actuator (SJA) was placed at two separate positions on a wing comprised of a NACA0015 airfoil. The first of the jet positions is located at 12% of the chord, hereby referred to as the leading edge Synthetic Jet Actuator. The second exit position is located at 99% chord of an airfoil and hereby is referred to as the trailing edge Synthetic Jet Actuator. The two locations produced different benefits as the angle of attack of the wing

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2

Tyagi, Ashok K. "Jet to jet impingement in a confined space." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30117.pdf.

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3

Sanders, John E. "Jet dispersion in channels." Thesis, University of East London, 1998. http://roar.uel.ac.uk/1254/.

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This is an experimental and theoretical investigation of the dispersion of a round water jet discharging at various angles into a rectangular channel. A fundamental study of the jet is not only essential for a better understanding of the flow conditions produced by confined water jets but for a scientific approach to the design of hydraulic structures and to determine an efficient form of stilling basin for high velocity discharge from pipe outlets. The Laser Doppler Anemometry (LDA) technique was adapted for measurement of mean velocities and turbulence characteristics,, without any interfere

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4

Ashforth-Frost, Shirley. "Flow visualisation of semi-confined jet impingement." Thesis, Nottingham Trent University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385846.

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5

Luo, Xinfu. "Plasma based jet actuators for flow control." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348870/.

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A set of plasma based jet actuators were designed for flow control applications. The characteristics of these actuators and their flow control applications were studied experimentally in a low speed wind tunnel. A dielectric barrier discharge (DBD) based jet actuator is designed, which is made of a covered cavity with two spanwise aligned parallel slots. Two-component particle image velocimetry (PIV) measurements were conducted to determine the effect of actuator in quiescent air and on a canonical zero pressure gradient turbulent boundary layer. It was found that the designed plasma jet actua

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6

Wells, Adam Joseph. "Experimental investigation of an airfoil with co-flow jet flow control." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011656.

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7

Santhanakrishnan, Arvind. "CHARACTERIZATION AND FLOW PHYSICS OF PLASMA SYNTHETIC JET ACTUATORS." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_diss/545.

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Plasma synthetic jet actuators are investigated experimentally, in which the geometrical design of single dielectric barrier discharge (SDBD) plasma actuators is modified to produce zero-mass flux jets similar to those created by mechanical devices. The SDBD plasma actuator consists of two rectangular electrodes oriented asymmetrically and separated by a layer of dielectric material. Under an input of high voltage, high frequency AC or pulsed DC, a region of plasma is created in the interfacial air gap on account of electrical breakdown of the ambient air. A coupling between the electric field

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8

Smith, Matthew James. "The Analysis and Prediction of Jet Flow and Jet Noise about Airframe Surfaces." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23897.

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Aircraft noise mitigation has been an ongoing challenge for the aeronautics research community. In response to this challenge, aircraft concepts have been developed in which the propulsion system is integrated with the airframe to shield the noise from the observer. These concepts exhibit situations where the jet exhaust interacts with an airframe surface. Jet flows interacting with nearby surfaces exhibit a complex behavior in which acoustic and aerodynamic characteristics are altered. The physical understanding and accurate modeling of these characteristics are essential to designing future

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9

Garcia, Robert Gordon. "CFD simulation of flow fields associated with high speed jet impingement on deflectors." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/31675.

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Computational Fluid Dynamics is used to analyze the formation of under-expanded jets and to investigate the three-dimensional flow field associated with the impingement of free jets onto stationary deflectors. This investigation was performed to develop a verified modeling ability for such problems. Predictions were compared with the experimental results obtained by Donaldson and Snedeker [1]. Computational models for free and impinging jets were created according to the data provided in Ref. 1. Numerical results for each of the experiments performed in this benchmark report are presented.

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10

Konduri, Indu Mohan. "Flow characteristics of jet fans in mines : experimental and numerical modeling /." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-152159/.

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11

Sun, Yanxia 1976. "Hot-wire sensing of a micro-jet flow." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/89335.

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12

Alamry, Khalid Ahmad Abet. "Flow induced polymer degradation during ink-jet printing." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/flow-induced-polymer-degradation-during-inkjetprinting(88d2394a-d6be-4291-ba64-9544932e5279).html.

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The effect of hydrogen bonding interactions on the drop generation of both acid and hydroxyl-containing polymer solutions is reported showing that polymer chain relaxation can be influenced through the use of appropriate polymer co-solvent interactions for polymers having weight average molecular weight (Mw) < 100 kDa. Reported for the first time is evidence of flow-induced polymer degradation during inkjet printing for both poly(methylmethacrylate) and polystyrene in good solvent. Polymers having Mw either less than 100 kDa or greater than approximately 1,000 kDa show no evidence of molecular

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13

Burr, Janice E. "Jet mixing : the role of numerical flow visualization /." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12162009-020204/.

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14

Crittenden, Thomas M. "Fluid actuators for high speed flow control." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7742.

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In order to extend fluid-based flow control techniques that have been demonstrated at low subsonic speeds to high speed flows, it is necessary to develop actuators having sufficient momentum to control and manipulate high speed flows. Two fluidic actuation approaches are developed where the control jet may reach supersonic velocities and their performance is characterized. The first actuator is a compressible synthetic (zero net mass flux) jet. This is an extension of previous work on synthetic jets with an increase in driver power yielding substantial pressurization of the cavity such that th

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15

Tabrizi, Seyed Pariviz Alavi. "Jet impingement onto a circular cylinder." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263841.

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16

Vasanthakumaran, R. "Jet dissipation in deep wells." Thesis, University of East London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261606.

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17

Catlett, Matthew Ryan. "Flow Induced Noise from Turbulent Flow over Steps and Gaps." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32926.

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The existence of small surface discontinuities on a flow surface generate significant pressure fluctuations which can manifest as radiated far field sound and affect the fluctuating near wall pressure field exerted on the flow surface. A significant amount of research has been performed on various step and gap flows; however few have dealt with step heights that are small relative to the incoming boundary layer. Fewer still have been concerned with measuring the effect on the fluctuating wall pressure field or the radiated far field sound from these small surface discontinuities. This stud

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18

Hayes-McCoy, Declan. "Direct computations of a synthetic jet actuator." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6454.

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Synthetic jet actuators have previously been defined as having potential use in both internal and external aerodynamic applications. The formation of a jet flow perpendicular to the surface of an aerofoil or in a duct of diffuser has a range of potential flow control benefits. These benefits can include both laminar to turbulent transition control, which is associated with a drag reduction in aerodynamic applications. The formation and development of zero-net-mass-flux synthetic jets are investigated using highly accurate numerical methods associated with the methodology of Direct Numerical Si

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19

Agrawal, Anmol. "Hingeless flow control over an airfoil via distributed actuation." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4919.

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An experimental investigation was undertaken to test the effectiveness of a novel design for controlling the aerodynamics of an airfoil. A synthetic jet actuator (SJA) was placed inside a NACA 0015 airfoil with its jet at 12.5% of the chord length, hereby referred to as the leading edge actuator. Four centrifugal fans across the span were mounted at 70% of the chord and the jet formed by them was located at 99% of the chord, hereby referred to as the trailing edge actuator. The effects of these actuators on the aerodynamic properties were studied, separately and then in conjunction, with varyi

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20

McDufford, Michael D. "Identification of noise sources in a heated jet flow." Connect to resource, 2006. http://hdl.handle.net/1811/6440.

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Thesis (Honors)--Ohio State University, 2006.<br>Title from first page of PDF file. Document formatted into pages: contains vi, 38 p.; also includes graphics. Includes bibliographical references (p. 37-38). Available online via Ohio State University's Knowledge Bank.

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21

Lanitis, Nicolas. "The turbulent structure of the jet in cross-flow." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/246593.

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In this thesis the structure of the jet in cross flow in the far field was investigated experimentally using time-resolved, multi-scale and statistically independent Stereoscopic Particle Image Velocimetry measurements to reveal the mean and instantaneous three-dimensional (3D) structures. All of the measurements were performed in the Counter-rotating Vortex Pair (CVP) plane for a high velocity ratio and jet Reynolds number. Statistical measurements at various downstream locations and velocity ratios are presented. Probability density functions of the streamwise vorticity field showed that eac

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22

Mohajer, Behzad. "Flow characteristics of single and double liquid jet impingement." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/60142.

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In the past few decades, the increasing demands for superior cooling systems in various industries have shifted the focus onto impinging liquid jets as an efficient, powerful cooling technique. Although much has been done on the thermal aspects of jet impingement, the available knowledge still lacks an in-depth understanding of the fluid dynamics involved in the phenomena that dictate the associated transport mechanisms. The present thesis has been planned to study the fluid dynamics of the interaction between a liquid, free-surface impinging jet with a solid surface, and also with a neighbori

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23

Ball, Stephen. "Near wall flow characteristics in jet impingement heat transfer." Thesis, Nottingham Trent University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388866.

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24

Baiense, Jr Joao C. "Vortex Generator Jet Flow Control in Highly Loaded Compressors." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-theses/916.

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"A flow control method for minimizing losses in a highly loaded compressor blade was analyzed. Passive and active flow control experiments with vortex generator jets were conducted on a seven blade linear compressor cascade to demonstrate the potential application of passive flow control on a highly loaded blade. Passive flow control vortex generator jets use the pressure distribution generated by air flow over the blade profile to drive jets from the pressure side to the suction side. Active flow control was analyzed by pressuring the blade plenum with an auxiliary compressor unit. Active flo

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25

Schneider, Gerald Manfred. "Structures and turbulence characteristics in a precessing jet flow /." Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phs358.pdf.

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26

Yuan, Yiqing. "Jet Fluid Mixing Control Through Manipulation Jet Fluid Mixing Control Through Manipulation of Inviscid Flow Structures." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28097.

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Rapid mixing is crucial for the efficient and environment-friendly operation of many industrial and propulsion devices involving jet flows. In this dissertation, two methodologies, self-excited nozzles and radially lobed nozzles, are studied and presented in order to enhance mixing in the near field of coflowing, subsonic, turbulent, free jet flows. The characteristics of the concentration field and the mixing performance are examined, mainly in quantitative manner. Two new parameters, mixing index and mixing efficiency index, are defined for free jets, allowing quantitative analysis of the mi

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27

Xia, Qingfeng. "Enhancement of liquids mixing using active pulsation in the laminar flow regime." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/enhancement-of-liquids-mixing-using-active-pulsation-in-the-laminar-flow-regime(bcb5ff26-11c4-4301-bdc1-9cae46f46580).html.

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Both the need for mixing highly viscous liquids more effectively and the advance of micro-scale applications urge the development of technologies for liquid mixing at low Reynolds numbers. However, currently engineering designs which offer effective jet mixing without structural and operational complexity are still lacking. In this project, the method of enhancing liquid mixing using active pulsation in the laminar flow regime is explored experimentally. This work started by improving the inline pulsation mechanism in an existing confined jet configuration whereby the fluid from a primary plan

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28

Fernando, L. M. "Jet mixing of water in crude oil pipelines." Thesis, Cranfield University, 1990. http://dspace.lib.cranfield.ac.uk/handle/1826/8650.

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The jet mixing of water in crude oil pipelines by single nozzle and multi-nozzle mixers was studied by dividing the mixing domain into to three regions. the penetration. near field and farfield regions. At the penetration region the quantitative experimental data were aided by a flow visualisation study in an attempt to to form fundamental semi-empirical correlations to estimate the entrainment rate of stratified water from the bottom and the Sauter mean diameter of the entrained water droplets for a single nozzle jet mixer. The flow field diagnostics into the near field region. defined as the

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29

Ritchie, Brian Douglas. "Quantitative Acetone PLIF Measurements of Jet Mixing with Synthetic Jet Actuators." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10536.

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Fuel-air mixing enhancement in axisymmetric jets using an array of synthetic jet actuators around the perimeter of the flows (primarily parallel to the flow axis) was investigated using planar laser-induced fluorescence of acetone. The synthetic jets are a promising new mixing control and enhancement technology with a wide range of capabilities. An image correction scheme that improved on current ones was applied to the images acquired to generate quantitative mixing measurements. Both a single jet and coaxial jets were tested, including different velocity ratios for the coaxial jets. The

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30

Rouse, Victoria J. "Comparison of heat transfer and fluid flow characteristics between submerged and free surface jet impingement for two-phase flow." Youngstown State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1546428292091476.

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31

Riley, Benjamin Matthew. "Magnetohydrodynamic lattice Boltzmann simulations of turbulence and rectangular jet flow." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1222.

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32

Kumar, Abhinav. "Flow control optimization in a jet engine serpentine inlet duct." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1399.

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33

Stevens, R. Scott. "Sensitivity of the California Coastal Jet to synoptic scale flow." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333477.

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34

Hosain, Md Lokman. "CFD Simulation of Jet Cooling andImplementation of Flow Solvers inGPU." Thesis, KTH, Numerisk analys, NA, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-123971.

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In rolling of steel into thin sheets the final step is the cooling of the finished product on the Runout Table. In this thesis, the heat transfer into a water jet impinging on a hot flat steel plate was studied as the key cooling process on the runout table. The temperature of the plate was kept under the boiling point. Heat transfer due to a single axisymmetric jet with different water flow rate was compared to cases of a single jet and two jets in 3D. The RANS model in ANSYS Fluent was used with the k −ε model in transient simulation of the axisymmetric model and steady flow for the 3D cases

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35

Jumah, Rami Yousef. "Flow and drying characteristics of a rotating jet spouted bed." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29056.

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A novel rotating jet spouted bed (RJSB) is developed and tested. It consists of a rotating air distributor with two radially located spouting air nozzles. The effects of bed height, distributor rotational speed, nozzle diameter and particle properties on the flow characteristics were examined. Various flow regimes were mapped as functions of distributor rotational speed and superficial air velocity for different materials and column dimensions. Empirical correlations were developed for the minimum spouting velocity, peak pressure drop and steady spouting pressure drop.<br>Drying kinetics of co

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36

Marr, Joseph Allen. "PAH chemistry in a jet-stirred/plug-flow reactor system." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12662.

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37

Thomas, Alistair Graham. "The mechanics of coating removal in jet and pipeline flow." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624302.

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38

Kundu, Reema. "Impact of engine icing on jet engine compressor flow dynamics." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54870.

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Core engine icing has been recognized to affect a wide variety of engines since the 1990's. This previously unrecognized form of icing occurs in flights through high altitude convective regions and vicinity of thunderstorms. Engine icing events involve power loss or damage associated to the engine core, namely instabilities such as compressor surge, stall, engine rollback and even combustor flameout events. The effects on compressor performance are significant in understanding the response of the engine to atmospheric ice ingestion. A one-dimensional axisymmetric flow model is used to simulate

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39

Tang, Hui. "Performance modelling of synthetic jet actuators for flow separation control." Thesis, University of Manchester, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595660.

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Active control of flow separation over multi-element high-lift systems of aircraft wings could result in the decrease of drag force, the increase of lift, and the reduction of system complexity. This, in return, lowers fuel consumption and increases profitability, making the goals of both the Kyoto Protocol and the European Vision for 2020 more achievable. To maximise the potential of this technology, forms of actuation with high efficiency, low power consumption, fast response, good reliability, and low cost, are required. The synthetic jet is a kind of jet that on one hand produces zero net

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40

Ghoma, Mohamed Ibrahem. "The effect of wall jet flow on local scour hole." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5501.

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This thesis reports on investigations carried out to study of the effect of horizontal wall jets on rough, fixed and mobile beds in open channel flow. Experimental tests were carried out, using fixed and mobile sediment beds. Computer simulation models for the flow within the jet and resulting sediment transport were developed and their results analysed in this study. In the experimental phase, tests were carried out with both fixed and mobile sediment beds. The shape of the water surface, numerous point velocity measurements and measurements of the evolving scour hole shape were made. Detaile

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41

Mignee, Juliette L. "Proper Orthogonal Decomposition Applied to a Supersonic Single Flow Jet." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1329935384.

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42

Sengupta, Soumyo Sengupta. "Investigation of Flow Dynamics of a SubsonicCircular to Rectangular Jet." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1467990955.

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43

Ghoma, Mohamed I. "The Effect of Wall Jet Flow on Local Scour Hole." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5501.

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This thesis reports on investigations carried out to study of the effect of horizontal wall jets on rough, fixed and mobile beds in open channel flow. Experimental tests were carried out, using fixed and mobile sediment beds. Computer simulation models for the flow within the jet and resulting sediment transport were developed and their results analysed in this study. In the experimental phase, tests were carried out with both fixed and mobile sediment beds. The shape of the water surface, numerous point velocity measurements and measurements of the evolving scour hole shape were made. Detail

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44

Sementi, Joshua Paul. "A study of jet exhaust-wing interaction /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/10002.

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45

Goparaju, Kalyan. "Flow and Acoustic Characteristics of Complex Supersonic Jets." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1510933315034965.

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46

Sivapragasam, M. "Numerical and experimental investigations on multiple air jets in counterflow for generating aircraft gas turbine engine inlet flow distortion patterns." Thesis, Coventry University, 2014. http://curve.coventry.ac.uk/open/items/0ad1d0c2-6693-4c6e-9224-5a2237862074/1.

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The performance of an aircraft gas turbine engine is adversely affected by the non-uniform or distorted flow in the inlet duct. Inlet flow distortion lowers the surge margin of the engine‟s compression system with surge occurring at much lower pressure ratios at all engine speeds. The compressor and/or engine are subjected to ground tests in the presence of inlet distortion to evaluate its performance. The simplest method of simulating inlet distortion during these tests is by installing a distortion screen ahead of the engine on the test bed. The uniform inlet flow to the compressor becomes n

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47

Perret, Matias Nicholas. "Experimental measurements of a two phase surface jet." Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/5041.

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The effects of bubbles on a jet issued below and parallel to a free surface are experimentally studied. The jet under study is isothermal and in fresh water, with air injectors that allow variation of the inlet air volume fraction for 0% to 13%. Measurements of the jet exit conditions, water velocity, water entrainment, Reynolds stresses and surface currents have been performed using LDV, PIV and surface PIV. Air volume fraction, bubble velocity, chord length and free surface elevation and RMS have been obtained using local phase detection probes. Visualization was performed using laser-induce

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48

El-Okda, Yasser Mohamed. "Jet/Wall Interaction: An Experimental Study with Applications to VSTOL Aircraft Ground Effects." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32207.

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The flow field of a twin jet impinging on ground plane with and without free-stream and at low jet-height-to-diameter ratios was investigated using the Particle Image Velocimetry (PIV) technique. Detailed, time-averaged flow field data are obtained via the high-resolution and the high-sampling rate instantaneous velocity field that is made available via the PIV technique. A model of twin jet issuing from 0.245m circular plate, with 0.019m jet exit diameter, and with jet span to diameter ratio of 3.0 is placed in a water tunnel with the jets in tandem arrangement with respect to the free-stream

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49

Aguirre, John. "Study of 3-Dimensional Co-Flow Jet Airplane and High-Rise Building Flow Using CFD Simulation." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_theses/181.

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The purpose of this thesis is to design and study an aircraft which implements the Co-Flow Jet (CFJ) airfoil concept, as well as to study the CAARC standard highrise building. The design concept is verified mainly by the use of a Computational Fluid Dynamics (CFD) package. A thorough methodology for geometry and mesh generation is developed, and subsequently applied to the two cases. The first case studied is that of the CFJ Airplane (CFJA). It consists of a threedimensional, highly blended, ying wing geometry implementing the Co-Flow Jet airfoil concept. Though a thorough comparison to a bas

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50

Chiatto, Matteo. "Synthetic Jet Actuators for Flow Control." Tesi di dottorato, 2017. http://www.fedoa.unina.it/11800/1/Chiatto_Matteo_29.pdf.

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Among the various active flow control techniques, Synthetic Jet (SJ) actuators represent a very promising technology due to their short response time, high jet velocity and absence of traditional piping, that matches the requirements of reduced size and low weight. Therefore, understanding in depth the basic physical aspects driving the operation of these actuators is a key point. A practical tool, employed for design and manufacturing purposes, consists in the definition of a low-order model, lumped element model (LEM), which is able to predict the dynamic response of the actuator in a relati

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