INVESTIGATION OF THE INFLUENCE OF LIQUID FUEL INJECTION RATE ON THE COMBUSTION PROCESS USING KIVA–II SOFTWARE
DOI:
https://doi.org/10.31489/2023No3/43-51Keywords:
numerical methods, computer simulation, chemical kinetics, liquid fuel combustion, heptane, turbulent heat and mass transfer, injection, combustion chamberAbstract
In this work, the ignition of liquid fuel was studied at various rates of fuel injection into the combustion chamber. The studied processes are described by the following equations: continuity, momentum, energy, k-ɛ turbulence model and others. The computational experiment was carried out using the KIVA-II software. The numerical method is efficient and takes into account various factors such as multistage chemical chain reactions, transfer of momentum, heat and mass by convection, radiation, turbulence, etc. In order to select the optimal parameters of the organization of these processes influence of the heptane injection rate into the combustion chamber on the process of combustion and self-ignition of heptane was studied. The injection rate of heptane varied from 160 m/s to 400 m/s an interval of 30 m/s. The size and temperature distributions of heptane droplets before evaporation, the concentration fields of carbon dioxide, and the temperature fields in the combustion chamber depending on the rate of fuel injection through the injector into the combustion chamber were obtained. The optimal range of heptane injection speed was determined, which is 250 m/s - 280 m/s, in order to increase the efficiency of the combustion chamber and reduce the negative impact on the environment.
References
McAllister S., Chen J., Carlos Fernandez-Pello A. Fundamentals of Combustion Process. Mechanical Engineering Series, Springer Publication. 2011, 302 p. (Electronic textbook).
Askarova A.S., Gorohovsky M.A., Bolegenova S.A., Berezovskaya, I.E. Numerical modeling of the processes of ignition and combustion of liquid fuels: monograph. Almaty, Kazakh University. 2015, 124 p. [in Russian]
Kowalski M., Żurek J., Jankowski A. Modelling of combustion process of liquid fuels under turbulent conditions. Journal of KONES Powertrain and Transport, 2015, Vol. 22, Is. 4, pp.355 – 364. doi:10.5604/12314005.1168562
Amsden A.A., O’Rourke P.J., Butler T.D. KIVA-II: A Computer Program for Chemically Reactive Flows with Sprays. Technical report. 1989, 180p. doi:10.2172/6228444
Askarova A.S., Bolegenova S.A., Voloshina I.E., Ryspaeva M.Zh. Influence of liquid fuel mass on its self-ignition and combustion. Proceedings of the National Academy of Sciences of the Republic of Kazakhstan. Series of Physics and Mathematics, 2002, No.2, pp. 3 – 11. [in Russian]
Engine combustion network database. Sandia National Laboratories, USA. 2007. Web. Available at: https://ecn.sandia.gov/engines/
Kärrholm F.P., Tao F., Nordin N. Three-dimensional simulation of diesel spray ignition and flame lift-off using KIVA-3V CFD code. SAE Technical Paper, 2008, 2008-01-0961. doi:10.4271/2008-01-0961
