Study of Alternative Fuels and Their Knock Behavior and Various Suppression Methods for Engine Knock

Abstract

A research in knocking combustion is indispensable because it determines the engine’s durability, fuel consumption, power density as well as its noise and emission performance. In highly boosted spark ignition engines with random pre-ignition events, knocking has been intensively studied both in academia and industries. Ultimately conventional knock in SI engines are reviewed by the suppression methods including the use of injection strategy, knock sensor, and exhaust gas recirculation (EGR). With the population increasing at an ever alarming rate, the world has seen a tremendous increase in the prices of fossil fuels, and are skyrocketing day-by-day. With an incessant consumption of fossil fuels, the global temperature is on the rise either, and we are already on course of achieving the average global temperature of 1.5°C. Considering the unexpected changes in Earth’s weather patterns, switching to alternative fuels would indubitably play a cardinal role in attenuating both – climate catastrophe and toxic gases – such as CO, CO2, NOx, etc., which envenoms the air quality. This paper presents the manoeuvre and origin of the use of alternative fuels in spark ignition engines. We have held accountable three types of fuels - alcoholic fuels, gaseous fuels, and liquid fuels. Additionally this work shows the research directions for the usage of alternative fuels in vehicles powered by spark ignition engines and finally the value of Octane Index of Alcohol-Gasoline blend under particular operating conditions has also been analyzed.