Combustion temperatures of hydrocarbons and fuels

Summary

• 1. In the combustion of aromatic hydrocarbons, the engine combustion-chamber temperature is substantially higher than that with isoparaffins. Of the aromatics that were studied, benzene gives the highest combustion temperature and m-xylene the lowest.

• 2. The combustion-chamber temperatures with AI-93 automotive gasolines (leaded and unleaded) with the same total aromatics content were practically identical, as was the temperature for a premium-grade gasoline.

• 3. Adding an isoparaffinic component (alkylate) to a naphtha from cat reforming under severe conditions gave some lowering of engine cylinder and exhaust-gas temperatures.