Measurement of Convective and Radiant Heat Flux in DI Diesel Engines 18ICES/097
Authors
Tatsuya Kuboyama - Tokyo Institute of Technology
Hidenori Kosaka - Tokyo Institute of Technology
Tetsuya Aizawa - Tokyo Institute of Technology
Yukio Matsui - Tokyo Institute of Technology
Abstract
To clarify the heat loss mechanism in DI diesel engines, total and radiant heat fluxes at various points on the piston head of a rapid compression-expansion machine were measured using thin-film thermocouples. Ambient oxygen volume fraction was varied to investigate the effects of flame temperature on heat loss. Experimental results showed that the spatial distribution of radiant heat flux is uniform. A comparison between the measured total and radiant heat fluxes showed that the contribution of the radiation to the total heat loss is approximately 7% regardless of the change in the oxygen volume fraction from 21% to 15%.