Simulation of Thermal State of the Diesel Cylinder Head and Valves

A problem of thermal state simulation of parts of the diesel combustion chamber is considered. A mathematical model of thermal state of the cylinder head and valves of the diesel engine is described. The relationships are analyzed for determining the thermal boundary conditions of the cylinder head surfaces (fire deck, inlet and outlet ports, and cooled surface) and the engine valves and also for finding the thermal conductivity ofjoints of the parts. A method for combined calculation of the cylinder head and valves is offered which does not require performing several iterations for determination of the coordinated temperature field of the parts. Additionally, the method makes it possible to take into account that the boundary conditions and temperature field of the valve are not axisymmetric. The mathematical simulation of the thermal state of the cylinder head, valves, and valve seats of the diesel of 12ChN15/18 type is conducted. The simulation results and their analysis are presented.

References

[1] Popov V.M. Teploobmen v zone kontakta raz’emnykh i neraz’emnykh soedineniy [Heat transfer in the contact area of detachable and permanent joints]. Moscow, Energiya Publ., 1971. 214 p.

[2] Chaynov N.D., Ivashchenko N.A., Krasnokutskiy A.N., Myagkov L.L. Konstruirovanie dvigateley vnutrennego sgoraniya [Internal combustion engine design]. Moscow, Mashinostroenie Publ., 2008. 494 p.

[3] Chaynov N.D., Myagkov L.L., Malastovskiy N.S. Modelirovanie teplovogo sostoyaniya kryshek tsilindrov porshnevykh dvigateley [Simulation of the thermal state of cylinder heads of piston engines]. Moscow, MGTU im. N.E. Baumana Publ., 2011. 29 p.

[4] Chaynov N.D. Issledovanie teplovogo i napryazhennogo sostoyaniya golovok tsilindrov dvigateley vnutrennego sgoraniya. Diss. dokt. tekhn. nauk [Study of the thermal and stress states of cylinder heads of internal combustion engines. Dr. tehn. sci. diss.]. Moscow, 1975.

[5] Ivashchenko N.A. Prognozirovanie temperaturnykh poley detaley porshnevykh dvigateley. Diss. dokt. tekhn. nauk [Prediction of temperature fields in piston engine parts. Dr. tehn. sci. diss.]. Moscow, 1994.

[6] Ivin V.I., Grekhov L.V. Heat dissipation in the engine outlet. Dvigatelestroenie [Engine Constr.], 1988, no. 12, pp. 6-8 (in Russ.).

[7] Kavtaradze R.Z. Lokal’nyy teploobmen v porshnevykh dvigatelyakh [Local heat transfer in piston engines]. Moscow, MGTU im. N.E. Baumana Publ., 2007. 472 p.

[8] Onishchenko D.O. Issledovanie teplovogo sostoyaniya detaley dizelya v trekhmernoy postanovke s primeneniem eksperimental’nykh granichnykh usloviy. Diss. kand. tekhn. nauk [Investigation of the three-dimensional thermal state of diesel engine parts using experimental boundary conditions. Cand. tehn. sci. diss.]. Moscow, 2002.

[9] Varlamova L.P., Tibanov V.P. Metodicheskie ukazaniya k vypolneniyu domashnego zadaniya po razdelu "Soedineniya" [Methodical guides for accomplishing the homework on joints]. Moscow, MGTU im. N.E. Baumana Publ., 2003. 88 p.

[10] Onishchenko D.O. Uluchshenie effektivnykh i ekologicheskikh pokazateley dizelya i snizhenie teplovykh nagruzok na ego osnovnye detali. Diss. dokt. tekhn. nauk [Improving the efficiency and environmental performance of a diesel engine and reducing thermal loads on its main parts. Dr. tehn. sci. diss.]. Moscow, 2013.