Performance Analysis of a Modified Internal Combustion Engine.

摘要

The purpose of this study is to provide optical and other information on the processes undergone in the combustion and balancing chambers of the Naval Academy Heat Balanced Engine (NAHBE). In the NAHBE engine a pressure exchange cap is fitted on top of the piston to form a balancing chamber underneath. The pressure exchange between expansion and compression waves generated by this apparatus permits lower combustion temperatures and pressures, along with a significant decrease in pollutants emitted by the engine. The combustion cycle resulting from the pressure exchange cap is a combination of both the OTTO and Diesel cycles, with added advantages not found in either of these two cycles. Previous laboratory results have indicated: (1) up to 25% reduction of fuel consumption, (2) reduction in peak operating pressures from 660 to 470 psi and exhaust temperature reduction on the order of 50 F, (3) over 90% reduction in pollutants (carbon monoxide, hydrocarbons, and nitrogen oxides), depending on load and compression ratio, (4) multifuel capability (low octane gasoline, fuel oil, alcohol and water, alcohol and charcoal), and (5) significant noise reduction. High-speed photography was utilized for visualization of the processes.