Effect of Compression Ratio on Combustion

Effect of Compression Ratio on Combustion Points : Effect of Compression Ratio on Combustion, ic engine A senior density ratio increased the pressure and temperature of the mixture at the point of ignition and decreases the amount of residual gas in the mixture. These are favorable conditions for the ignition of the mixture. The duration of ignition lag in the first phase decreases and the rate of pressure rise in the main phase increases. A high compression ratio increases the surface-to-volume ratio of the combustion chamber, thus increasing the relative amount of mixture near the walls. This part of the mixture after, bums in the third phase. All this retards the MBT timing at higher compression ratios. The combustion duration up to the point of most pressure also decreases. The maximum pressure approaches TDC. Heat liberated up to the point of most pressure is reduced and the weight of the after burning process in the third phase increase.