Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Spray Characteristics of Gel Propellants in Open-End Swirl Injector
L. J. Yang, W. Wang, F. Q. Fu, X. Liu
Abstract:
Gel propellants, which behave both liquid and solid propellant characteristics, have broad application prospects. Gel propellant is a kind of power-law fluid, and its high viscosity and difficulty in atomization have restricted its application in the aerospace field. Open-end swirl injectors can be combined with other nozzles to form gas-liquid coaxial nozzles. At present, there are few studies on the application of gel propellants to open-end swirl injectors. A set of gel simulant spray system was set up to investigate the spray characteristics of gel propellants in open-end swirl injector. Three kinds of gel simulants with different rheological parameters were used. Three open-end swirl injectors with different tangential channel diameters were designed to change the geometrical characteristics constant A of the swirl injectors. The thickness of the liquid film in the open-end swirl injectors and their spray characteristics were experimentally studied. The liquid film thickness of the gel propellant was measured by the conductance method. The details of the liquid film break-up and spray development were recorded using a high-speed camera. The effects of the above rheological and geometrical parameters on liquid film thickness, discharge coefficient, spray cone angle and liquid film breakup length, etc. were obtained, and the empirical equations were summarized.
Keywords:
power-law fluid, thickness of liquid film, geometrical characteristics constant

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2019.031

In Proceedings Topical Problems of Fluid Mechanics 2019, Prague, 2019 Edited by David Šimurda and Tomáš Bodnár, pp. 229-234 ISBN 978-80-87012-69-7 (Print) ISSN 2336-5781 (Print)