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Showing 1 to 20 of 31 for “"Jet Flows"”.
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The numerical analysis of turbulent free jet flows.
… Element, method of analysis to free turbulent jet flows.This problem was considered to be appropriate for several reasons. First, a jet of fluid entrains and mixes with another fluid in a number of important engineering applications. Examples of these are legion and include their utilisation in …
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Nozzle Free Jet Flows Within the Strong Curved Shock Regime
Made available in DSpace on 2014-12-13T19:55:22Z (GMT). No. of bitstreams: 1 7524404.pdf: 1976653 bytes, checksum: a92ac27c436c21fa824e0d39bc362133 (MD5) Previous issue date: 1975
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Uncertainty and sensitivity analysis of computational simulations of industrial jet flows
… analysis have been carried out in two industrial jet flows with different objectives. First, an impinging swirling air jet for heat transfer purposes is generated by an axisymmetric rotating pipe. Despite that many mechanisms to generate swirling jets for heat transfer can be found in literature, …
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An Experimental Investigation of the Turbulent Characteristics of Co-Axial Jet Flows and Their Role in Aerodynamic Noise Generation
Made available in DSpace on 2014-12-11T17:26:12Z (GMT). No. of bitstreams: 1 7511777.pdf: 6516423 bytes, checksum: 3869c37ae70eb2d6573e38bf31e7d7d2 (MD5) Previous issue date: 1974
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Jet Fluid Mixing Control Through Manipulation Jet Fluid Mixing Control Through Manipulation of Inviscid Flow Structures
… 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 …
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Numerical Modeling of a Turbulent Plane Jet Impingement on a Solid Wall
Turbulent jet flows constitute a common problem for engineers. Owing to self-preservation in nature, a submerged jet has been well solved by the zero-equation turbulence model. However, in practice, the flow field is often confined by side walls or normal walls. Near those solid boundaries, flow …
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The Turbulence Structure of Heated Supersonic Jets with Offset Total Temperature Non-Uniformities
… aircraft on communities. The overarching goal of jet noise research is to optimize noise reduction techniques for supersonic jets. In order to achieve this, a more complete theoretical framework which links the jet boundary conditions to the turbulence production in the jet plume and the far-field …
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Etude expérimentale des sons auto-entretenus produits par un jet issu d'un conduit et heurtant une plaque fendue
… (up to 125 dB) by a low Mach number free plane jet impinging on a slotted plate, known as slot-tone, is experimentally studied. For all geometries of the slot’s edge tested, the tones are generated from 6 m/s and when a resonant mode of the duct from which the jet flows out is excited. The …
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Hybrid Eulerian/Lagrangian 3D methods for high Reynolds number reactive flows
… and multiphysics nature of the underlying flows. This thesis presents progresses in combustion modeling for the numerical simulation of turbulent reactive jet flows through the design of a hybrid Eulerian/Lagrangian and massively parallel 3D numerical simulation tool. The adaptivity of the …
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IMPACT OF NEW CHEVRON CONFIGURATIONS ON MIXING ENHANCEMENT IN SUBSONIC JETS
… to the overall noise of an aircraft is jet noise – the noise generated by the gases exiting the exhaust nozzle of a jet engine. One approach to mitigate jet noise is through the implementation of chevron nozzles. In the present context, first, a baseline axisymmetric separate-flow …
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Active noise control in supersonic impinging jets using pulsed microjets : actuator design, reduced-order modeling
… years, it has been demonstrated that direct microjet injection into the shear layer of the main jet disrupts the feedback loop inherent in high speed impinging jet flows, thereby significantly reduces the adverse effects. The amount of noise reduced by microjet actuation is known to be dependent …
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Dynamics of swirling jets and flames
Even the simplest swirling jet flows possess an astonishing degree of complexity. This complexity is a two-edged sword, presenting both a unique opportunity to advance the science of fluid mechanics as well as a major barrier for a variety of engineering applications. In particular, swirling jet …
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Radical-molecule reaction dynamics in the low temperature regime.
… the uniform expansion and near 1 K in the free jet) environments which are not at chemical equilibrium. The design of the axisymmetric Laval nozzles, which are integral in producing the uniform supersonic expansion, is reviewed in depth. The experimental details pertinent to the characterization …
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Sensitivity analysis of low-density jets and flames
… global modes for axisymmetric low-density jets and lifted jet diffusion flames. The adjoint global modes provide a map of the most sensitive locations to open-loop external forcing and heating. For the jet flows considered here, the most sensitive region is at the inlet of the domain. The …
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On the stability of plane viscoelastic shear flows in the limit of infinite Weissenberg and Reynolds numbers
… instability of inviscid parallel shear flows are investigated through a linear stability analysis. We focus on the upper convected Maxwell model in the limit of infinite Weissenberg and Reynolds numbers. Specifically, we study the effects of elasticity on the instability of a few classes …
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The Analysis and Prediction of Jet Flow and Jet Noise about Airframe Surfaces
… 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 …
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A Wiener Chaos Based Approach to Stability Analysis of Stochastic Shear Flows
… end, we study the stability of stochastic shear flows, and adopt a framework based upon the Wiener Chaos expansion for efficient numerical computations. We explore the stability of stochastic Poiseuille, Couette and Blasius boundary layer type base flows, presenting stochastic results for both …
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Compressible Flow Characterization Using Non-Intrusive Acoustic Measurements
… non-intrusive flow monitoring in compressible flows is explored and a novel sonic anemometry and thermometry (SAT) technique is developed. Using multiple arrangements of SAT equipment, a compressible acoustic tomography technique was also developed to resolve flow non-uniformities. Three …
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Active Flow Control of a Boundary Layer Ingesting Serpentine Diffuser
… ingested boundary layer creates strong secondary flows that lead to severe flow distortion at the engine face, increasing the possibility of engine surge. This study investigated the use of enabling active flow control methods to reduce engine-face distortion. An ejector-pump based system of …
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Optimisation and Parametric Study of Heat Transfer in Transpired Solar Collectors Using Computational Fluid Dynamics
… employed to reduce grid size and to also resolve jet flows and boundary layers taking place in the plenum and around the absorber plate. Accuracy of the CFD model has been validated against experimental data. An optimisation study has been carried out based on the CFD model to derive the optimal …
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