Results 221 to 230 of about 24,743 (266)

On Autoignition of Co-Flow Laminar Jets

SIAM Journal on Applied Mathematics, 2016
The authors analyze a mathematical model accounting for the thermal runaway followed by ignition in laminar jets. After a change of variables and unknowns through an adimensionalization process, they consider the system of parabolic equations \(\theta _{\zeta }=\theta _{\xi \xi }+\frac{1}{\xi } \theta _{\xi }\) for \((\xi ,\zeta )\in (0,\lambda )\times
Peter V. Gordon, Uday G. Hegde, Michael C. Hicks, Michael J. Kulis   +3 more
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Periodically arranged co-flowing jets

Journal of Fluid Mechanics, 1994
The problem of a periodic planar arrangement of a large number of co-flowing, interacting jets is investigated. It is shown that this interaction gives rise to strong nearfield oscillations of large-scale spatial coherence and to far-field inhomogeneities.
E. Villermaux, E. J. Hopfinger
openaire   +1 more source

Turbulent Jets in Co-Flowing Streams

Journal of the Engineering Mechanics Division, 1979
This paper presents a method for predicting the variation of the velocity and length scales for plane and circular turbulent jets issuing into co-flowing streams. The basis of this method is an assumed variation in the turbulence production integral in the transition region from the strong jet to the weak jet.
Pande B.B. Lal, Nallamuthu Rajaratnam
openaire   +1 more source

Characteristics of Underexpanded Co-Flow Jets

Applied Mechanics and Materials, 2014
The effect of inner nozzle lip thickness on the co-flow jet characteristics has been studied experimentally. Co-flow nozzles with inner nozzle lip thicknesses of 3 mm and 15 mm have been investigated. The thick-lip nozzle promotes mixing better than the thin-lip nozzle, for all the underexpanded operating conditions. The co-flow nozzle with thin-lip is
T. Srinivasarao, P. Lovaraju, E. Rathakrishnan   +2 more
openaire   +1 more source

Linear stability of co-flowing liquid–gas jets

Journal of Fluid Mechanics, 2001
A temporal, inviscid, linear stability analysis of a liquid jet and the co-flowing gas stream surrounding the jet has been performed. The basic liquid and gas velocity profiles have been computed self-consistently by solving numerically the appropriate set of coupled Navier–Stokes equations reduced using the slenderness approximation.
Gordillo, J. M., Pérez-Saborid, M., Gañán-Calvo, A. M.   +2 more
openaire   +2 more sources

Jet Noise Reduction in Co-Flowing Jets with Finite Lip Thickness

International Journal of Vehicle Structures and Systems, 2020
Passive control for suppressing mixing noise from Co-Flowing Jets (CFJ) is presented in this study. The idea behind this is to reduce the convective Mach number of turbulent eddies that produce intense sound radiation. The present study analyses co-flowing jets with a bypass ratio of 6.3 and the primary nozzle lip thickness of 10 mm.
S. Kevin Bennett, R. Naren Shankar
openaire   +1 more source

BEHAVIOR OF CO-FLOW JETS COUPLED WITH A LONGITUDINAL PERTURBATION

Journal of Applied Mechanics and Technical Physics, 2021
In this study, a numerical simulation is used to show the physics of a coupled forced perturbation and liquid jet in the presence of a low-velocity coaxial gas flow. The volume of fluid (VOF) approach is employed to capture the liquid–gas interface. A sinusoidal velocity with a finite frequency and amplitude is applied at the liquid jet inlet to define
D. Soltani, M. Shafaee
openaire   +1 more source

Prediction of Jets and Flames in Co-Flowing Streams

ASME 1991 Computers in Engineering Conference: Volume 1 — Artificial Intelligence; Expert Systems; CAD/CAM/CAE; Computational Fluid/Thermal Engineering, 1991
Abstract The theoretical computation of jets and flames in co-flowing streams is of considerable interest in aerothermochemistry. Axisymmetric flowfields are considered with time-mean velocity, temperature and species concentrations (three components — fuel, oxygen, and products) being predicted via a version of the GENMIX computer code.
S. Ha, David G. Lilley
openaire   +1 more source

Experimental study of overexpanded co-flowing jets

The Aeronautical Journal, 2008
AbstractAn experimental investigation was carried out to find the effect of an annular co-flow jet on the primary supersonic jet from Mach 2 nozzle at different levels of overexpansion. In this study, a convergent-divergent circular nozzle of exit Mach number 2, surrounded by an annular convergent circular nozzle with an annular gap of 4·4mm was used ...
H. Sharma, A. Vashishtha, E. Rathakrishnan, P. Lovaraju   +3 more
openaire   +1 more source

Experimental study of supersonic co-flowing jet

Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2018
A detailed experimental study was carried out to investigate the behaviour of a Mach 2 primary jet in the presence of a Mach 1.6 annular co-flow. The lip thickness of the inner nozzle was 7.75 mm. The characteristics of jets were investigated at nozzle pressure ratios 3 to 8, in steps of 1.
De Satyajit, Ethirajan Rathakrishnan
openaire   +1 more source