Effect of oxy hydrogen gas addition on combustion, performance, and emissions of premixed charge compression ignition engine

Abstract

Premixed Charge Compression Ignition (PCCI) is one of the well-known ways to achieve low NOx and Soot emissions in Internal Combustion engines. However, this strategy has shown limited scope to bring down the Carbon Monoxide (CO) and Hydrocarbons (HC) emissions. To overcome this drawback, a novel attempt had been made to use oxy hydrogen gas as fuel additive in the PCCI engine. The conventional CI engine was converted into PCCI engine by Port Fuel Injection of diesel fuel and preheating of air. The comparison was made between Conventional Diesel Combustion (CDC) and PCCI mode with and without use of oxy hydrogen gas. Due to accelerated chemical reactions, Indicated Mean Effective Pressure and Indicated Thermal Efficiency improved. Due to the addition of the oxy hydrogen gas the average reduction in CO emission was 26.19% at 25% load and 18.88% at 50% load. In the case of HC, the average emission reduction was 19.27% at 25% load and 23.74% at 50% load. NOx emissions were within the range of 10 ppm even after the addition of oxy hydrogen gas. The oxy hydrogen gas addition resulted in almost negligible Smoke and oxides of nitrogen emissions even without the use of exhaust gas recirculation.