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Saturday, November 21, 2020 | History

3 edition of Computer programs to predict induced effects of jets exhausting into a crossflow found in the catalog.

Computer programs to predict induced effects of jets exhausting into a crossflow

Computer programs to predict induced effects of jets exhausting into a crossflow

  • 37 Want to read
  • 13 Currently reading

Published by The Center in Moffett Field, Calif .
Written in English

    Subjects:
  • Jet planes.,
  • Aircraft exhaust emissions -- United States.

  • Edition Notes

    StatementS.C. Perkins, Jr., M.R. Mendenhall ; prepared for Ames Research Center under contract NAS2-11796.
    SeriesNASA contractor report -- 166591., NASA contractor report -- NASA CR-166591.
    ContributionsMendenhall, M. R., Ames Research Center., Nielsen Engineering & Research.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17667528M

    This phenomenon has to be taken into account in the conception of the industrial device. Most of the studies on this topic are oriented towards the air entrainment created by a plunging jet. The aim of this study is twofold: to characterize the main parameters about the phenomenology of resurgent jets and to predict the resurgence generation Author: Dimitri Domingie, Jean-Baptiste Deuff, Olivier Perelman. ow-induced trading across all mutual funds, and document a signi cant, temporary price impact of such uninformed trading. Next, given that mutual fund ows are highly predictable, I show that the expected part of ow-induced trading positively forecasts stock and mutual fund returns in the following year, which are then reversed in sub-sequent years. A CFD Study of Twin Impinging Jets in a Cross-Flow The Open Numerical Methods Journal, , 4: Daniel Ostheimer, Zhiyin Yang Department of Engineering and Design, The University of Sussex, Brighton BN1 9RH, UK. Electronic publication date 17/1/ [DOI: /] CrossRef Citations: 0Cited by: 4. A PARAMETRIC STUDY OF A SYNTHETIC JET IN A CROSS FLOW Figure 5: Details of orifice and additional dye ports 3 Results The purpose of the preliminary results presented in this paper is to give an insight into the possible fluid dynamic interactions occurring between the thin shear layer and the synthetic jets on the cylinder. Considering the.


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Computer programs to predict induced effects of jets exhausting into a crossflow Download PDF EPUB FB2

Get this from a library. Computer programs to predict induced effects of jets exhausting into a crossflow. [S C Perkins; M R Mendenhall; Ames Research Center.; Nielsen Engineering &.

The Interaction of Jets with Crossflow. Effects of vortex-induced velocity on the development of a synthetic jet issuing into a turbulent boundary layer exhausting into crossflow with a Author: Krishnan Mahesh.

It is common for jets of fluid to interact with crossflow. This article reviews our understanding of the physical behavior of this important class of flow in the incompressible and compressible Computer programs to predict induced effects of jets exhausting into a crossflow book.

Experiments have significantly increased in sophistication over the past few decades, and recent experiments provide data on turbulence quantities and scalar mixing. Quantitative Cited by: Transverse jet in supersonic crossflow: A jet in crossflow (JICF) is a fundamental canonical flow for the investigation of turbulent mixing and combustion.

It is of relative simplicity yet retaining many features of interest, such as three-dimensionality, separation and recirculation regions, wall-bounded effects, and vortical flows. The jets issue into a wind tunnel at density-weighted jet-to-cross flow velocity ratios r = 10 and r = 21, with corresponding Reynolds numbers 6, The changes in the flow due to the effects of heat release are examined and ensemble statistics of Cited by: 1.

This paper reports the results of an experimental investigation on the effects of jet velocity profiles on the flow field of a round jet in cross-flow (JICF) using laser-induced fluorescence and digital particle-image velocimetry techniques (DPIV).

Tophat and parabolic jets were considered, with the momentum ratios (MRs) ranging from to Cited by:   This paper studies the trajectories and near field of round jets in crossflow. Incompressible direct numerical simulations are performed at velocity ratios of and and the effects of jet velocity profile and boundary layer thickness on the jet trajectory are by: jets, which are ejected into the cross-flow boundary layer through inclined holes.

One of the first detailed papers which report the transverse jet in the cross flow was written by Bergeles et al. [2]. Morton and Ibbetson [3] analyzed the warp mechanism of the. effects of fluid properties. By way of example, Figure 1 compares predicted penetration values1,2,4,5,6,7 for a water jet injected into a crossflow at room temperature and atmospheric pressure.

The results demonstrate considerable scatter, the reasons for which are not en-tirely clear. 0 5 10 15 20 25 30 05 10 15 20 25 30 35 X, mm Y, mm Ref 1.

Assessing Jet-Induced Spatial Mixing in a Rich, Reacting Crossflow T.N. Demayo, M.Y. Leong, the assessment of jet mixing into a crossflow can be applied to a wide range of fields such as gas jets in a rich crossflow and a uniformly lean, low temperature mixture at the exit plane of the.

The jet in crossflow at very low Reynolds number (Re=) with and without block is performed by means of large eddy simulation for the jet-to-crossflow velocity ratios (r) ranging from 1 to 3. Introduction.

The flow fields of jets in a crossflow are encountered in several engineering and environmental applications, for example, in cooling tower, smoke issuing from smokestacks, chimneys, volcanoes, thermal discharges into river, film cooling of turbine blades, fuel injection for burners, V/STOL aircraft design, enhancement of industrial mixing and drying processes, by:   The paper reports on measurements in the flow generated by a jet issuing from a circular outlet in a wall into a cross-stream along this wall.

For the jet-to-crossflow velocity ratios R of1 and 2, the mean and fluctuating velocity components were measured with Cited by: On the structure of jets in a crossflow: Authors: Andreopoulos, J. presented for various velocity ratios and Reynolds numbers of a jet issuing perpendicularly from a developing pipe flow into a crossflow.

The results are complete with conditional averages of various turbulent quantities for one jet-to-cross-flow velocity ratio R of The process of formation of a counter jet as a result of impinging of jets radially injected into a confined crossflow of cylindrical duct was studied experimentally and numerically.

The axial temperature distributions upstream of the jet injection plane were measured at various jets/crossflow mass flow rates, also near the jet injection by: AN EXPERIMENTAL STUDY OF JETS IN CROSSFLOW CONFINED IN A NARROW SQUARE DUCT H.

Wang, L. Araneo, A. Coghe @ Dept. of Energy, Politecnico di Milano, Bovisa, Via Lambruschini,Milano, Italy Abstract The flow field resulting from injecting a turbulent jet into a steady cross-flow. A Study of Liquid Jets Injected Transversely into a Swirling Crossflow S.

Tambe*, and S. Jeng Department of Aerospace Engineering and Engineering Mechanics University of Cincinnati Cincinnati, OH USA Abstract An experimental study has been conducted to study the effect of a swirling crossflow on transversely injected liquid jets.

Transverse jet in supersonic crossflow A jet in crossflow (JICF) is a fundamental canonical flow for the investigation of turbulent mixing and combustion.

It is of relative simplicity yet retaining many features of interest, such as three-dimensionality, separation and recirculation regions, wall-bounded effects, and vortical flows. wire anemometry on vertical jets placed at a distance of 4 nozzle diameters in a wind tunnel using a jet-to-crossflow ratio equivalent to 2.

The comparison concerned the extent of the different jets’ trajectories and the velocity and turbulence flow details. Particle rings/shells/cylinders dispersed by the radial impulsive loadings ranging from strong blast waves to moderate shock waves form a dual coherent jetting structure consisting of particle jets which have different dimensions.

In both circumstances, the primary jets are found to initiate from the inner surface of particle layers and propagate through the thickness of particle layers, Author: Kun Xue, Xiaoliang Shi, Kaiyuan Du, Haoran Cui. FUNDAMENTAL STUDY OF A JET-IN-CROSSFLOW INTERACTING WITH A VORTEX GENERATOR FOR FILM COOLING APPLICATIONS Abstract Results of an experimental study are presented on the effectiveness of a vortex generator (VG) in preventing lift-off of a jet-in-cross-flow (JICF).

The study is pertinent to film-cooling applications and its. impinging jets, tests are mainly conducted at the minimum crossflow condition. The experiments are also conducted at injection distance from 2 to 8 jet hole diameters and jet-to-jet spacing from 4 to 8 jet hole diameters. Jet hole diameter Reynolds number is 4, Thermochromic liquid crystal is used to obtain heat transfer Size: 1MB.

A CFD Study of Twin Impinging Jets in a Cross-flow The Open Numerical Methods Journal,Volume 4 25 the shear layers surrounding the impingement regions from the jets and the upwash fountain.

The latter of which are dominated by strong curvature effects. They also performed a numerical simulation of the same flow case and concluded.

single jets, and many advantages over single jets, such as better mixing and noise reduction, have been noticed (Raghunathan and Reid, ).

In most of the industrial applications, multiple circular jets are used; however, considering plane twin jets is. Abstract (summary): This study investigated the breakup processes of subcritical cryogenic jets injected in to subsonic crossflows of heated air. The crossflow speed, temperature, and jet velocity were varied to demonstrate the effect of thermal differences on a jet in : William S.

Richards. "piston slap", plays an important role on the acoustic emission of internal combustion engines, if compared with other sources as the injection system, i.e., the impacts in the journal bearings, the "gear rattle" of the transmission, the valve train and the auxiliaries.

The "piston slap" occurs because of suddenCited by: 2. Abstract: A circular jet in the crossflow was simulated numerically using the k-ε- and k-ω-turbulence models. Two different cases were calculated. In the first case the jet to mean flow ratio is R= and in the other case R= Overlapping mesh was used in order to utilize a refined grid without an excessive amount of grid : Juhaveikko Ala-Juusela.

The Transfer Function Model, A Computer Program for Determination of Jet Engine Test Cell Exhaust Particulates and Opacity [C. Richards] on *FREE* shipping on. A three-dimensional numerical study has been performed of the effects of sonic gaseous hydrogen injection through multiple transverse injectors subjected to a supersonic crossflow.

Solutions were obtained for a series of injection configurations in a Mach crossflow, with a global equivalence ratio of phi = Results indicate a different flow structure than for a Cited by: Sequential Enlargement Combination of Separated Effect Contributions for the Analysis of Liquid Jet Atomization in Cross-flow Conditions Other effects that have to be taken in account are the viscosity, the convection cross-section of a jet injected into a cross flow (from circular to ‘kidney’ shape) due to the.

Time-accurate computations of isolated circular synthetic jets in crossflow Time-accurate computations of isolated circular synthetic jets in crossflow Rumsey, C.L.; Schaeffler, N.W.; Milanovic, I.M.; Zaman, K.B.M.Q. Results from unsteady Reynolds-averaged Navier–Stokes computations are described for two different synthetic jet flows.

AIAA Optimization of Controlled Jets in Crossflow S. Shapiro, J. King, A. Karagozian and R. M'Closkey UCLA Los Angeles, CA 41st AIAA Aerospace Sciences Meeting and Exhibit 6–9 January Reno, Nevada For permission to copy or to republish, contact the American Institute of Aeronautics and Astronautics.

also investigated (Okada and Hiraoka, ) due to rather large effects on the main stream. The drawbacks of such large jets are the complex duct systems and heavyweights.

Therefore, in recent years, many researchers have been studying active flow control methods based on micro scale devises. One of them is a “synthetic jet”. jets is known to be quite effective in a variety of flow conditions.

Synthetic jets have been used in widely fluid dynamic applications including static and dynamic stall control of airfoils.

), jet vectoring. 4), jet mixing enhancement. 5), and thermal mixing. There have been numerous studies on the benefits of synthetic jets as a.

A jet is a coherent stream of fluid that is injected into a surrounding medium, usually from some nozzle, aperture or orifice.

A co-flow jet is formed by flow issuing from a nozzle into a medium which is also moving in a certain velocity. The outer secondary flow protects the central inner flow from being dissipated easily. Experimental study of a round jet in cross-flow by means of PIV Gennaro Cardone, Francesco G.

Nese and T. Astarita Jets in cross-flow are of great relevance in a lot of jets in combustors and waste disposal into water bodies and in the atmosphere. As reported by many authors, the behavior of the jet depends mainly on the jet to free.

Numerical simulations of particle image velocimetry (PIV) experiments conducted with vortex generating jets (VGJs) on a flat plate, at a Reynolds number based on plate length of 50, were performed for three flow conditions using a time-accurate hybrid Navier-Stokes solver. Time-averaged steady blowing of angled jets, subjected to a zero pressure gradient, yielded Cited by: 6.

book [3] Tood Lammle describes a number of attacks, some of which are mentioned below: Autorooters: Crackers use something called a rootkit to probe, scan and then capture data on a strategically positioned computer that is poised to give them “eyes” into an entire system [3].

Back doors: These are simply paths leading into a computer network. Effects of amplitude and frequency of synthetic jet on the characteristics of induced jet are investigated.

To estimate effects of the parameters, flow inside the synthetic jet cavity and orifice and the outer flow is simultaneously simulated using large-eddy simulation (LES). Comparison of the present LES result with the experimental data shows that three-dimensional LES of the Cited by: Fuel efficiency for trucks, energy savings for open case refrigeration all using aerodynamic and scientific principals, that have evolved over the past 3.

A large-eddy simulation (LES) of a round jet penetrating normally into a cross-flow is described. The jet-to-cross-flow velocity ratio is at a Reynolds number of 46, based on the jet bulk velocity and the jet diameter.

The simulations are performed with steady and unsteady boundary conditions. A passive scalar is discretized either with a central or a TVD .Application of FEA Metal Cutting Model for Determining Surface Roughness A.

E. Rodygina Irkutsk State Technical University, Russia, Irkutsk, Lermontova street, @ Abstract – In conditions of the rigid technological system and an unworn tool the strain constituent of microirregularity height has the largest Size: KB.The structure of round jets in cross-flow was studied using flow visualization techniques and flying-hot-wire measurements.

The study was restricted to jet to freestream velocity ratios ranging from to and Reynolds numbers based on the jet diameter and free-stream velocity in the range of to