1987-08-01

Heat Transfer in the End Gas 870168

This paper describes experimental and theoritical studies of a turbulent combustion bomb. We find a correlation between heat transfer to the wall and the Initial turbulence intensity.
Wall temperature and pressure measurements were made for three levels of initial turbulence. All tests were performed with an equivalence ratio of 1.0, and the turbulence intensity was controlled by varying the time delay between mixture intake and spark ignition.
Assuming one-dimensional conduction, the surface heat flux was computed from the wall temperature data. Gas temperatures were computed from the pressure data assuming isentropic compression. Based on turbulent velocity measurements made in previous studies, these results permitted a correlation of Nusselt number with turbulent Reynolds number.
Using this correlation, we estimate the heat transfer in the end gas and its effect on the gas temperature. He use a chemical kinetic model to estimate the effect of the end ga3 heat transfer on the octane number required to prevent knock.

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