Theoretical Consideration of Power Loss Caused by Combustion Knock

In this paper the author presents a theoretical analysis to show that the power loss accompanying combustion knock may be attributed to a mass vibration of the gases within the combustion chamber rather than to radiation. Equations are developed, based on perfect gases, to show that, on the basis of assumptions made, pressure rise with normal combustion is proportional to the quantity of charge burned and to show the loss in effective pressure caused by the vibration resulting from knocking combustion. The latter have been developed for both the Otto and Diesel cycles and the relative theoretical losses for the two cycles is indicated. The author indicates the effect of differences between actual and assumed conditions.