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Showing 1 to 14 of 14 for “"Jet in crossflow"”.
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Turbulent Simulations of a Buoyant Jet-in-Crossflow
… lack of complex analysis for a thermally buoyant jet in a stratified crossflow has motivated the studies presented. A computational approach using the incompressible Navier--Stokes equations (NSE) under the Boussinesq approximation is utilized. Temperature and salinity scalar transport equations …
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CHARACTERIZATION OF THE INITIAL SPRAY FROM A JET IN CROSSFLOW
An experimental study on the initial spray from a liquid jet in air crossflow was conducted using Shadowgraphy and Particle Image Velocimetry (PIV) techniques. Momentum ratio and gas Weber number were varied to study their effects on the column trajectory, spray trajectory, breakup locations and …
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Spatio-temporal Characteristics of a Spray from a Liquid Jet in Crossflow
A liquid jet in a crossflow is often used to as a fuel injection method for combustion systems. Parameters such as penetration and core trajectory are used as characterization for the spray and specification of design criteria for combustor geometry. In addition to penetration and core trajectory, …
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A Numerical and Experimental Evaluation of the Turbulent Heat Flux in a Heated Jet in Crossflow
<p>The injection of fully-developed turbulent heated air from a tube into a cooler turbulent duct flow is examined, as an analogy to film cooled turbine blades. Scale Resolving Simulations (SRS) are used to examine the flow numerically. A Detached Eddy Simulation (DES) methodology is examined but …
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Oscillatory Flow Driven by Cavity
… with an amplitude and frequency dependent on the incoming flow properties and the geometry of the cavity. Experiments and numerical analyses have been performed to determine the effects of a flow passing through an axisymmetric cavity and discharging into a transverse freestream. The study focuses …
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The entrainment and mixing of a round buoyant turbulent jet in cross-flow
… thesis summaries the results of an experimental investigation of the near-field behavior and physics of the round buoyant turbulent jet in crossflow. In particular, the study centers on the physics associated with entrainment and mixing phenomena of the jet with the goal of better understanding …
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Planar Laser Induced Fluorescence Experiments and Modeling Study of Jets in Crossflow at Various Injection Angles
Planar Laser Induced Fluorescence (PLIF) with acetone seeding was applied to measure the scalar fields of an axisymmetric freejet and an inclined jet-in-crossflow as applicable to film cooling. From the scalar fields, jet-mixing and trajectory characteristics were obtained. In order to validate the …
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Large Eddy Simulation and Analysis of Shear Flows in Complex Geometries
<p>In the present work, large eddy simulation is used to numerically investigate two types of shear flows in complex geometries, (i) a novel momentum driven countercurrent shear flow in dump geometry and (ii) a film cooling flow (inclined jet in crossflow). Verification of subgrid scale model is …
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LES of Jets and Sprays Injected into Crossflow
… this thesis is to numerically simulate a fluid jet injected into a crossflow of the same or another fluid, respectively. Such flows are encountered in many engineering applications in which cooling or mixing plays an important role, e.g. gas turbine combustors. The jet in crossflow (JICF) is …
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Large eddy simulations of hydrogen/methane jets in crossflows under engine-relevant conditions
… alternatives, hydrogen has emerged as a promising fuel due to its high reactivity and zero-carbon emission potential. However, realising its full potential requires careful integration into existing combustion systems, particularly through fuel-flexible strategies such as hydrogen-methane …
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Numerical Investigations of a Pipe Jet With Coil Inserts With and Without Crossflow
… presents a comprehensive numerical study of coil-inserted elevated turbulent jets, aimed at advancing the understanding of passive flow control mechanisms and their effects on both free jet and jet in crossflow (JICF). It provides new insight into the fundamental physics of swirl-assisted mixing …
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experimental investigation of a reacting transverse jet in a high pressure oscillating vitiated crossflow
Staged combustion is one design approach in a gas turbine engine to reduce pollutant emission levels. In axially staged combustion, portions of the air and fuel are injected downstream of a lean premixed low NOx primary combustion zone. The gas residence time at elevated temperatures is decreased …
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Structure and Dynamics of a Reacting Jet Injected into a Vitiated Crossflow in a Staged Combustion System
Secondary injection of the fuel, also referred to as staged combustion, is being studied by gas turbine manufacturers as a means of increasing the power output of the gas turbine systems with minimal contribution to NOx emission. A reacting jet issuing into a high pressure vitiated cross flow …
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Experimental investigation of nitrogen oxide production in premixed reacting jets in a vitiated crossflow
The presented work describes the experimental investigation of nitrogen oxide (NOx) emissions from reacting jets in a vitiated crossflow (RJICF). It is motivated by interest in axial staging of combustion as an approach to reduce undesirable NOx emissions from gas turbine combustors operating at …