Influence of fuel jet nozzle geometry on mixing enhancement in supersonic crossflow

2018 ◽  
Vol 2018 (0) ◽  
pp. OS9-3
Author(s):  
Takahiro SEGUCHI ◽  
Kazuaki HATANAKA ◽  
Mitsutomo HIROTA ◽  
Srisha M.V.Rao ◽  
Tsutomu SAITO
Keyword(s):  
Nozzle Geometry ◽  
Mixing Enhancement ◽  
Fuel Jet ◽  
Jet Nozzle

Nozzle Geometry Effect on Twin Jet Flow Characteristics

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Muthuram A ◽  
Thanigaiarasu S ◽  
Rakesh Divvela ◽  
Rathakrishnan Ethirajan
Keyword(s):  
Mach Number ◽  
Flow Characteristics ◽  
Nozzle Geometry ◽  
Ambient Atmosphere ◽  
Free Jets ◽  
Twin Jets ◽  
Equivalent Area ◽  
Nozzle Configuration ◽  
Jet Nozzle ◽  
Nozzle Geometries

AbstractEffect of nozzle geometries on the propagation of twin jet issuing from nozzles with circle-circle, circle-ellipse, circle-triangle, circle-square, circle-hexagon and circle-star geometrical combinations was investigated for Mach numbers 0.2, 0.4, 0.6 and 0.8. In all the cases, both jets in the twin jet had the same Mach number. All the twin jets of this study are free jets, discharged into stagnant ambient atmosphere. The result of the twin jets issuing from circle-circle nozzle is kept as the reference in this study. For all the twin jet nozzles, the inter nozzle spacing; the distance between the nozzle axes (S) was 20 mm and all the nozzles had an equivalent area of 78.5 mm2. Thus for all the cases of the present study, S/D ratio is 2. The results show that the mixing of the combined jet, after the merging point is strongly influenced by the combined effect of the nozzle geometry and jet Mach number. Among the six different twin jet nozzle configuration studied, circle-square combination is found to be the most superior mixing promoter.

scholarly journals Heat and mass transfer enhancement strategies by impinging jets: A literature review

2020 ◽  
pp. 227-227
Author(s):  
Florin Bode ◽  
Claudiu Patrascu ◽  
Ilinca Nastase
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Large Scale ◽  
Impinging Jet ◽  
Impinging Jets ◽  
Nozzle Geometry ◽  
Small Scale ◽  
Mixing Enhancement ◽  
Transfer Enhancement

Heat and mass transfer can be greatly increased when using impinging jets, regardless the application. The reason behind this is the complex behavior of the impinging jet flow which is leading to the generation of a multitude of flow phenomena, like: large-scale structures, small scale turbulent mixing, large curvature involving strong normal stresses and strong shear, stagnation, separation and re-attachment of the wall boundary layers, increased heat transfer at the impinged plate. All these phenomena listed above have highly unsteady nature and even though a lot of scientific studies have approached this subject, the impinging jet is not fully understood due to the difficulties of carrying out detailed experimental and numerically investigations. Nevertheless, for heat transfer enhancement in impinging jet applications, both passive and active strategies are employed. The effect of nozzle geometry and the impinging surface macrostructure modification are some of the most prominent passive strategies. On the other side, the most used active strategies utilize acoustical and mechanical oscillations in the exit plane of the flow, which in certain situations favors mixing enhancement. This is favored by the intensification of some instabilities and by the onset of large scale vortices with important levels of energy.

The Influence of the Regulator Diameter and Injection Nozzle Geometry on the Flow Structure in Pneumatic Dimensional Control Systems

1997 ◽  
Vol 119 (3) ◽  
pp. 609-615 ◽  
Author(s):  
C. Crnojevic ◽  
G. Roy ◽  
A. Bettahar ◽  
P. Florent
Keyword(s):  
Control Systems ◽  
Static Pressure ◽  
Separated Flow ◽  
Nozzle Geometry ◽  
Internal Diameter ◽  
Test Rig ◽  
Injection Nozzle ◽  
Static Pressure Distribution ◽  
Jet Nozzle ◽  
Experimental Findings

The present paper describes an experimental investigation of the various parameters affecting the operation of industrial pneumatic controllers based on the jet nozzle principle. A test rig was built to monitor supply pressure, air temperature, airflow characteristics, and the static pressure distribution over the flat plate on which the jet impinges. The results demonstrate the existence of a low pressure, separated flow zone, subject to fouling, which subsequently was eliminated by appropriate changes of the injection nozzle geometry. The previous experimental findings were also confirmed by numerical simulation of the flow. Experimental results also show that the internal diameter of the regulator, situated inside the measuring branch, has an important influence on the sensitivity of the apparatus, as well as influencing its range.

scholarly journals 313 Effect of Cold Air Jet Nozzle Geometry on Cooling Capacity and Tool Life in Cold Air Cutting

2006 ◽  
Vol 2006.43 (0) ◽  
pp. 89-90
Author(s):  
Masato KOMATSU ◽  
Motonori OKUBO ◽  
Satoshi MIURA ◽  
Kazuhiko SAKAKI ◽  
Yasuo SHIMIZU
Keyword(s):  
Tool Life ◽  
Cooling Capacity ◽  
Nozzle Geometry ◽  
Cold Air ◽  
Air Jet ◽  
Jet Nozzle

scholarly journals Jet mixing enhancement of a supersonic twin jet nozzle using rectangular tabs

2021 ◽  
Vol 1114 (1) ◽  
pp. 012048
Author(s):  
P N Ambily ◽  
A K Mubarak ◽  
L Rekha ◽  
P A Abdul Samad
Keyword(s):  
Mixing Enhancement ◽  
Jet Mixing ◽  
Jet Nozzle

Prediction of Z-Pinch Implosion Shape from Gas Jet Nozzle Geometry

1994 ◽  
Author(s):  
E. Waisman ◽  
R. Ingermanson ◽  
H. Murphy ◽  
N. Loter ◽  
W. Rix ◽  
...  
Keyword(s):  
Gas Jet ◽  
Nozzle Geometry ◽  
Jet Nozzle ◽  
Z Pinch

Effect of the Cool Air Jet Nozzle Geometry on the Cool Air Cutting

2004 ◽  
Vol 2004.5 (0) ◽  
pp. 85-86
Author(s):  
Motonori OKUBO ◽  
Masato KOMATSU ◽  
Kazuhiko SAKAKI ◽  
Yasuo SIMIZU
Keyword(s):  
Nozzle Geometry ◽  
Air Jet ◽  
Jet Nozzle

Enhancing cavitation intensity in co-flow water cavitation peening with organ pipe nozzles

2021 ◽  
pp. 1-19
Author(s):  
Amey Vidvans ◽  
Shreyes Melkote ◽  
Daniel G. Sanders
Keyword(s):  
Residual Stress ◽  
Mass Loss ◽  
High Speed ◽  
Nozzle Geometry ◽  
Practical Applications ◽  
Stress Measurements ◽  
Cavitation Intensity ◽  
Jet Nozzle ◽  
Organ Pipe ◽  
Pipe Geometry

Abstract Co-flow water cavitating jets induce compressive residual stress through cavitation impacts produced by the collapse of the cavitation cloud. Co-flow water cavitation peening causes minimal surface alteration compared to conventional processes such as shot peening, which is a major advantage. However, enhancement of cavitation intensity for co-flow water cavitation peening nozzles is required for practical applications requiring greater process capability. Scaling of co-flow cavitation peening nozzles to achieve greater cavitation intensity requires higher flow rates, thus requiring pumps of higher capacities. In contrast, organ pipe geometry nozzles can enhance cavitation intensity without significant increase in pump capacity and have been used in deep sea drilling applications. The objective of this work is to study the effects of organ pipe inner jet nozzle geometry on co-flow water cavitation intensity and peening performance relative to a standard (unexcited) inner jet nozzle geometry through experiments on aluminum alloy Al 7075-T651. Nozzle performance is characterized via extended mass loss and strip curvature tests, high-speed visualization of the cavitation cloud, analysis of impulse pressures, and through-thickness residual stress measurements. It is found that the optimum organ pipe inner jet nozzle geometry enhances the mass loss and peak strip curvature by 61% and 66%, respectively, compared to the unexcited inner jet nozzle. Residual stress measurements show that the organ pipe inner jet nozzle produces deeper compressive residual stresses in the material than the unexcited inner jet nozzle.

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