Influence of fluctuation velocity on the electric conductivity of hydrocarbon flames

Abstract

The feasibility of using ionization sensor for the investigation and diagnosis of the fuel combustion process in piston power plants with spark ignition is substantiated. It is shown that in order to expand the functions and increase the reliability of operation and signal processing accuracy of the ionization sensor it is necessary to know the impact of the flame fluctuating velocity on the latter. Based on the analysis of published data and in-house research a mechanism of the effect of fluctuation velocity on the electrical conductivity of hydrocarbon flame is proposed, estimated by the value of ion current.  A formula for calculating the ion current is proposed, which includes the fluctuation velocity, the flame temperature and the concentration of carbon particles in the fuel. For methane-air flame, it was revealed that for U' < 8 m/s an increase of ion current is observed, which is due to increased flame temperature and concentration of carbonaceous fuel particles in the zone of chemical reactions of the flame. When U' > 8 m/s the ion current decreases due to the growth of heat consumption for heating the incoming fuel in the flame front, directly proportional to the fluctuation velocity. The results can be used to predict and monitor characteristics of turbulence in the combustion chambers of power plants with the aid of the ionization sensor.

About the authors

A. P. Shajkin

Togliatti State University

Author for correspondence.
Email: td@tltsu.ru

Doctor of Science (Engineering), Professor
Professor of the Department of Energy-Converting Machinery and Control Systems

Russian Federation

I. R. Galiev

Togliatti State University

Email: sbs777@yandex.ru

Candidate of Science (Engineering)
Assistant Professor of the Department of Design and Operation of Vehicles

Russian Federation

A. V. Bobrovsky

Togliatti State University

Email: ba838@yandex.ru

Candidate of Science (Engineering)
Assistant Professor of the Department of Design and Operation of Vehicles

Russian Federation

References

  1. Semenov E.S., Sokolik A.S. Thermal and chemical ionization in flames. Combustion, Explosion, and Shock Waves. 1970. V. 6, Iss. 1. Р. 33-43.
  2. doi: 10.1007/BF02044894
  3. Aravin G.S., Semenov E.S. Connection between rates of chemical ionization and the combustion reaction in a laminar flame. Combustion, Explosion, and Shock Waves. 1979. V. 5, Iss. 5. Р. 589-593.
  4. doi: 10.1007/BF00740588
  5. Shaykin A.P., Budaev S.I., Galiev I.R. Relationship between carbon concentration in a fuel and characteristics of flame propagation with a magnitude of ion current. Vestnik of the Samara State Aerospace University. 2015. V. 14, no. 4. P. 156-163. (In Russ.). doi: 10.18287/2412-7329-2015-14-4-156-163
  6. Bogoslovskii V.P., Zaichikov V.V., Samoilov I.B. Probe measurements of ionization in a flame. Combustion, Explosion, and Shock Waves. 1974. V. 10, Iss. 5. Р. 705-710. P. 626-630.
  7. doi: 10.1007/BF01463975
  8. VanDyne E.A., Burcmyer C.L., Wahl A.M., Funaioli A.E. Misfire detection from ionization feedback utilizing the smartfire plazma ignition technology. SAE Technical Paper Series.
  9. doi: 10.4271/2000-01-1377
  10. Shaykin A.P., Ivashin P.V., Galiev I.R. Kharakteristiki rasprostraneniya plameni i ikh vliyanie na kontsentratsiyu nesgorevshikh uglevodorodov pri dobavke vodoroda v toplivovozdushnuyu smes' energeticheskikh ustanovok s iskrovym zazhiganiem [Characteristics of flame propagation and their impact on the concentration of unburnt hydrocarbons on addition of hydrogen to the fuel-air mixture of spark-ignition power plants]. Samara: Samarskiy Nauchnyy Tsentr RAN Publ., 2014. 203 р.
  11. Heywood J.B. Internal combustion engine fundamentals. New York: McGraw-Hill, 1988. 931 p.
  12. Warnatz J., Maas U., Dibble R.W. Combustion: Physical and Chemical Fundamentals, Modeling and Simulation, Experiments, Pollutant Formation. Springer Berlin Heidelberg, 2001. 299 p.
  13. doi: 10.1007/978-3-662-04508-4
  14. Zeldovich Ya.B., Barenblatt G.I., Librovich V.B., Mahviladze G.M. Matematicheskaya teoriya goreniya i vzryva [Mathematical theory of combustion and explosion]. Moscow: Nauka Publ., 1980. 478 p.
  15. Peters N. Turbulent combustion. Cambridge: Cambridge University Press, 2000. 304 p.
  16. Lopanov A.N. Fiziko-himicheskie osnovy teorii goreniya i vzryva [Physics and chemistry of the combustion and explosion theory]. Belgorod: Belgorod State Technological University Publ., 2012. 149 p.
  17. Shehata M.S., ElKotb M.M., Salem H. Combustion characteristics for turbulent prevaporized premixed flame using commercial light diesel and kerosene fuels. Journal of Combustion. 2014. V. 2014. Р. 1-17.
  18. doi: 10.1155/2014/363465

Statistics

Views

Abstract: 2582

PDF (Russian): 1291

Dimensions

PlumX

Refbacks

  • There are currently no refbacks.

Copyright (c) 2016 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