3 edition of Effect of mass-velocity on liquid jet atomization in Mach I gasflow found in the catalog.
Effect of mass-velocity on liquid jet atomization in Mach I gasflow
by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va
Written in English
|Other titles||Effect of mass velocity on liquid jet atomization in Mach I gasflow.|
|Statement||Robert D. Ingebo.|
|Series||NASA technical memorandum -- 100813.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
A mathematical model of the gas atomization of a liquid is developed. This model, in which the liquid is allowed to have infinite depth, takes into account both the compressibility of the gas and the viscosity of the liquid, enabling a prediction to be made of the expected drop size in the spray formed when a gas flows over a liquid. printing and agriculture in the form of crop spraying. In the process of atomization, a liquid jet or sheet is disin-tegrated by the kinetic energy of the liquid itself, or by exposure to high velocity air or gas . The quality of atomization is determined to a large extent by the design of the atomizer and properties of the fluid. To study the.
Break-up and atomization characteristics of JetA liquid fuel were investigated numerically. The results have been compared to various experimental results to evaluate the accuracy of the numerical model. The CFD code ANSYS-CFX was used to carry out the steady state analysis at different time scales. A comparison between the atomization characteristics of a pressure jet . 2. D. Kim and P. Moin, “Numerical simulation of the breakup of a round liquid jet by a coaxial flow of gas with a subgrid Lagrangian breakup model,” Center for Turbulence Research, Annual Research Briefs, Gañán-Calvo, Alfonso M. "Enhanced liquid atomization: From flow-focusing to flow-blurring.".
ABSTRACT. Results are presented from an experimental study of the penetration of a liquid jet in a gaseous crossflow. The experiments were conducted in an atmospheric pressure facility at crossflow air velocities up to m/s and temperatures up to °C using distilled water, acetone, and 4-heptanone as test liquids. diction of the height of a water jet shot vertically, for example, a fountain, or a water jet used to ﬁght a high rise ﬁre. The second is the theoretical prediction of the horizontal range of a water jet shot at a target from a distance, as is the typical case in a ﬁre. Height and range here refer to the maximum extent of the trajectory.
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Get this from a library. Effect of mass-velocity on liquid jet atomization in Mach I gasflow. [Robert D Ingebo; United States. National Aeronautics and Space Administration.]. i, NASA Technical Memorandum 8 Effect of' Mass-Velocity on Liquid Jet Atomization in Mach 1 Gasflow Robert D.
Ingebo Lewis Research Center Cleveland, Ohio LIQUID [NASA-TM) JET ATOHIZBTION EFFECT IN OF MACH MBSS-VEL3CXTY I GASFLOU ON ~ lNASA) 8 p CSCL 14fl Unclas. Atomizing-gas temperature effect on cryogenic spray dropsize Not in Library. Effect of mass-velocity on liquid jet atomization in Mach I gasflow Robert D.
Ingebo Not in Library. ILASS International Conference on Li Not in Library. Not in Library. 1 book W. Sirignano, 1 book Harvey L. Berger, 1 book Huimin Liu, 1 book Christophe.
Some studies proposed two separate correlations for the liquid jet trajectory, one for the near-field or column region and another for the far-field zone or spray plume region (e.g., Birouk et al. The injection of a liquid jet into a crossing Mach 6 air flow is investigated.
Experiments were conducted on a sharp leading edge flat plate with flush mounted injectors. An evaluation of proposed jet atomization theories shows that aerodynamic effects, liquid turbulence, jet velocity profile rearrangement effects, and liquid supply pressure oscillations each cannot alone explain the experimental results.
AIR DENSITY EFFECT ON THE ATOMIZATION OF LIQUID JETS IN CROSSFLOW. Combustion Science and Technology: Vol.
No.pp. details the effect of momentum ﬂux ratio on atomization and vaporization behaviors of jet fuels is yet to be conducted. This is the focus of the current research effort. Spray characteristics for a liquid jet injected into a cross-ﬂow of air have been studied extensively through experiments.
The measured film-boiling heat transfer coefficients are plotted against the bulk liquid velocities in Fig.and against the bulk liquid subcoolings in Fig.
As seen in Fig. the measured film-boiling heat transfer coefficients are classified at a certain bulk-liquid heat transfer coefficients below m s −1 are qualitatively close to the predicted results.
In particular, the effect of liquid jet and crossflow air velocity on the penetration height and spray area is studied in detail. It is noted that, at a given pressure, temperature, and crossflow air velocity, there is an optimum liquid jet velocity that corresponds to a maximum spray area and an optimum atomization process.
Atomization of a Liquid Jet Under Swirling Air Stream. 19 October DROP AND SPRAY FORMATION FROM A LIQUID JET. Annual Review of Fluid Mechanics, Vol. 30, No. Breakup of Viscous Liquid Sheets Subjected to Symmetric and Asymmetric Gas Flow. Effects of compressibility on the atomization of liquid jets.
Determining average diameter of drops formed by pneumatic atomization of a solution into a flame. Journal of Applied Spectroscopy21 (1), DOI: /BF D Bradley. On the atomization of liquids by high-velocity gases. For regions of the intact liquid jet a liquid volume fraction of unity is observed.
Thus, the jet starts to break up after a downstream position of z = 13 d noz. It is decided to consider the jet to be fully broken up when the centerline liquid volume fraction is below Understanding liquid-jet atomization cascades via vortex dynamics - Volume - A. Zandian, W. Sirignano, F. Hussain.
Capillary instability of cylindrical interfaces: (a) liquid jet, (b) liquid film on a fibre, (c) liquid film in a tube (adapted from). The instability time τ equals for a solid inviscid jet of radius h 0, and for a thin film of thickness e 0 deposited on a fibre of radius h 0.
Herrmann, M., Detailed Numerical Simulations of the Primary Atomization of a Turbulent Liquid Jet in Crossflow, ASME Journal of Engineering for Gas Turbines Power, (6),– Google Scholar. The experimental breakup of liquid jets subjected to a sinusoidal perturbation is investigated in the Rayleigh and first wind-induced regimes.
Stroboscopic illumination of the jet and laser photometry method are used. The ability of linear spatial and temporal theories to describe certain aspects of the phenomenon is stressed.
The paper studies the process of liquid atomization in high-speed gas jets with application to a subject of high-rate fuel nozzles. Experiments were carried out for gas-liquid jet with the central-axis feeding of liquid to the outlet of a confuser-type nozzle with pumping of air in subsonic and supersonic flow regimes.
The energy balance approach was developed for describing a gas-liquid jet. Relative motion between the liquid and the gas causes the disruption, eventual break-up and atomization of the liquid.
Good correlations exist for the liquid jet penetration and trajectories  for a wide range of conditions. Here, we will resolve the effect of gas-phase velocities, liquid injection and other parameters on the final drop size.
ILASS – Europe Effect of the Liquid Injection Angle on the Atomization of Liquid Jets in Subsonic Crossflows dependence of the operating conditions, settling at ≈ 2%. The three-dimensional character of the air flow the wind tunnel can be judged from the measured transverse profiles shown in Fig.
3b for different distances to the. The Effect of Nozzle Internal Flow on Liquid Jet Breakup. Figure: From top to bottom, the figures correspond to External only, Educated spray A, and Unprocessed Spray A simulations.
Contours of the time averaged, non-axial velocity are shown at different locations inside the nozzle orifice with part of the external liquid jet surface.Resumen de las partes del contenido del proyecto: Vorticity layers. - Breakup regimes of a liquid jet and mixing layers - Primary atomization: .The atomization of a liquid jet by a high speed cross-flowing gas has many applications such as gas turbines and augmentors.
The mechanisms by which the liquid jet initially breaks up, however, are not well understood. Experimental studies suggest the dependence of spray properties on operating conditions and nozzle geom- etry.