Characteristics of a fuel spray downstream the pressure atomizers under high pressure in the combustion chamber


Cite item

Full Text

Abstract

The paper presents numerical calculations of a fuel spray downstream a swirl-type fuel injector carried out for various pressures in the combustion chamber using the model of liquid film motion. The effect of the chamber pressure, or, to be more exact, the air density in the pressure chamber on the fuel spray characteristics is investigated. The mathematical model was constructed on the assumption of one- dimensional and steady swirling flow. The liquid is considered to be incompressible and have zero pressure gradient in the direction of the film motion and in the tangential direction. The influence of viscous forces on the motion of liquid is neglected, but the viscous interaction at the interface between liquid and gas is taken into account. The change of velocity in the circumferential and normal directions can be neglected, because in practice the film thickness is considerably smaller than the spray radius. It is shown that the pressure increase in the combustion chamber makes spray characteristics significantly different from those observed at atmospheric pressure. An increase of pressure results in increasing the thickness of the fuel film and decreasing the spray-cone angle. It leads to an increase in the average Sauter diameter in the spray of fuel atomized by the pressure atomizer. The air flow downstream the swirl nozzle has the opposite influence on the size of drops in case of increased pressure in the chamber.

About the authors

A. A. Sviridenkov

Central Institute of Aviation Motors

Author for correspondence.
Email: sviriden@ciam.ru

senior research scientist

Russian Federation

V. V. Tretyakov

Central Institute of Aviation Motors

Email: tretjak@ciam.ru

Candidate of Science (Physics and Mathematics), Associate Professor
leading research scientist

Russian Federation

References

  1. Suo J., He L. Theoretical Study on the Spray Characteristics of Plain Jet Atomization Under High Back Pressure. 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. 2007. doi: 10.2514/6.2007-5689
  2. Sviridenkov A.A., Tretiyakov V.V. Effect of coagulation of drops on fuel spray characteristics behind atomizers. Vestnik of the Samara State Aerospace University. 2009. No. 3 (19), part 2. P. 157-161. (In Russ.)
  3. Sviridenkov A.A., Tretiyakov V.V. Simulation of drop coagulations in swirled time dependent streams with reference to gas turbine engine combustion chambers. Vestnik of the Samara State Aerospace University. 2013. No. 3 (41), part 1. P. 230-234. (In Russ.)
  4. Chuech S.G. Numerical Simulation of Nonswirling and Swirling Annular Liquid Jets. AIAA Journal. 1993. V. 31, Iss. 6. P. 1022-1027. doi: 10.2514/3.11724
  5. Vasil'ev A.Yu., Maiorova A.I., Sviridenkov A.A., Yagodkin V.I. Formation of liquid film downstream of an atomizer and its disintegration in gaseous medium. Thermal Engineering. 2010. V. 57, Iss. 2. P. 151-154. doi: 10.1134/s0040601510020114
  6. Dityakin Yu.F., Klyachko L.A., Novikov B.V., Yagodkin V.I. Raspylivanie zhidkostey [Atomization of liquids]. Moscow: Mashinostroenie Publ., 1977. 208 p.
  7. Chen X., Yanga V. Effect of ambient pressure on liquid swirl injector flow dynamics. Physics of Fluids. 2014. V. 26, Iss. 10. doi: 10.1063/1.4899261

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2017 VESTNIK of Samara University. Aerospace and Mechanical Engineering

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies