Fuel spraying and mixing in a simulated combustion chamber in the presence of air flow precession

Abstract


Numerical calculations of the flow downstream the flame tube of the combustion chamber in the conditions of nonstable flow are presented in the paper. The obtained velocity fields were used for the modeling of non-stationary nature of the flow. The comparison of the results of calculations carried out using this model with the results of calculations based on the fluent commercial packages showed their good agreement. It was found that the flow under consideration is essentially nonstationary, with signs of precession. Numerical calculations of liquid fuel droplet distributions in the area stimulating the configuration of the combustor liner were carried out. It was found that a significant portion of the fuel hits the walls of the chamber. The processes of atomization of fuel in a non-stationary precession jet flowing out of the chamber are investigated experimentally. It has been shown that the interaction of fuel jet with precession air flow gives a sufficiently homogeneous air-fuel mixture with an average droplet diameter of about 50 microns or less. Data on the dependence of the concentration distribution and droplet size on flow regimes of air and fuel have been obtained. It is shown that the base of the jet fuel in a swirling air flow under the influence of the vortex precession performs rotational - oscillatory movement. This process is visually observed only in conditions of pulsed illumination of the flow.


About the authors

A. A. Sviridenkov

Central Institute of Aviation Motors, Moscow

Author for correspondence.
Email: sviriden@ciam.ru

Russian Federation

Senior Researcher

V. V. Tretyakov

Central Institute of Aviation Motors, Moscow

Email: tretjak@ciam.ru

Russian Federation

Candidate of Science (Physics and Mathematics), Associate Professor

Senior Researcher

References

  1. Tret`yakov V.V., Sviridenkov A.A., Toktaliev P.D. Simulation of flow and mixture formation nonstationarity in combustion chambers. Russian Aeronautics. 2013. V. 56, no. 1. P. 44-49.
  2. Tret`yakov V.V., Mironov A.K. Sviridenkov A.A., Toktaliev P.D. Experimental and calculation research of non-steady-state flows with a vortex precession, spray and a mixing in precessing jets. Proceeding Internation Congress Problems and prospects of development of the high technology engineering industry. Kazan: KNITU-KAI Publ., 2013. Р. 322-329 (In Russ.)
  3. Tret`yakov V.V. Methods of modelling of spray fuelprocesses and a mixing behind swirl front devices of combustion chambers. International Scientific and Practical Conference «Modern technologies, materials, equipment and accelerated restoration of qualified human force potential - key links in the revival of domestic aircraft and rocket construction». V. 2. Kazan: Kazan National Research Technologikal University Publ., 2012. P. 272-283. (InRuss.)

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