Combustion and emission performance of isopropanol-butanol-ethanol (IBE) mixed with diesel fuel on marine diesel engine with nano YSZ thermal barrier coating

The effect of piston coating on the combustion and emission performance of IBE and diesel blended fuel was experimental studied. The experimental conditions were set to be a orthogonal matrix of three loads from low to high, coated and uncoated, IBE20 fuel and D100 fuel. The heat release rate, ignition delay periods and combustion duration were calculated by the cylinder pressure curves. The break thermal efficiency was calculated by the fuel consumption rate, and the concentration of soot, NOx and CO in the exhaust was collected. It was found that Nano-YSZ thermal barrier coating (TBC) can effectively reduce heat transfer loss, increase in-cylinder combustion temperature, and effectively solve the problems of high latent heat of vaporization and ignition delay of alcohol fuel. The experimental results showed that the Nano-YSZ coating could effectively reduce the brake specific fuel consumption, which was reduced by 5% when using pure diesel under 25% load, and was reduced by 7.3% for IBE20 fuel. Furthermore, TBC_IBE20 (IBE20 used in TBC Engine) exhibited the highest thermal efficiency under the three working conditions. Under all operating conditions, IBE20 had the potential to reduce soot emissions but increase NOx emissions, and thermal barrier coatings could amplify this potential.