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Effect of elasticity of Boger Fluids on the atomization behavior of an impinging jet injector

Negri, Michele and Ciezki, Helmut (2015) Effect of elasticity of Boger Fluids on the atomization behavior of an impinging jet injector. Atomization And Sprays, 25 (8), pp. 695-714. Begell House. ISSN 1044-5110

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Abstract

Gelled propellants are of interest for rocket and ramjet propulsion systems because of their safety and performance benefits. During spray tests with doublets, such as on impinging jet injectors, it was observed that the breakup of the fluid sheet of several gels did not lead to the formation of droplets; instead, threadlike structures were formed. Such structures may cause a reduction in combustion efficiency and the accumulation of unburned material in the combustion chamber. The goal of the work presented here is to determine which physical properties influence thread formation. Spray tests were conducted with Boger fluids under atmospheric conditions concerning pressure and temperature with a like-on-like impinging jet injector. The range of injection velocities from 5 to over 70 m/s was studied. Images of the sprays were obtained with a shadowgraph technique. In order to obtain quantitative results from shadowgraph images, a code was implemented to determine a characteristic dimension of the threads. A clear correlation between the relaxation time, which is an indicator of the intensity of elastic effects, and the dimension of the obtained threads was observed. These results suggest that thread formation is caused by nonlinear elastic effects, while shear viscosity and surface tension do not seem to influence the formation of these structures.

Item URL in elib:https://elib.dlr.de/100701/
Document Type:Article
Title:Effect of elasticity of Boger Fluids on the atomization behavior of an impinging jet injector
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Negri, MicheleMichele.Negri (at) dlr.deUNSPECIFIED
Ciezki, HelmutHelmut.Ciezki (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Atomization And Sprays
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:25
Page Range:pp. 695-714
Publisher:Begell House
ISSN:1044-5110
Status:Published
Keywords:liquid sheet breakup, Boger fluid, viscoelasticity, impinging jet injector, gelled propellant
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Military Technologies
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Rocket Propulsion
Deposited By: Schmidt, Melanie
Deposited On:14 Dec 2015 08:07
Last Modified:06 Sep 2019 15:23

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