Indian Journal of Science and Technology

Abstract

Objectives: This paper aims at improving fuel economy and lowering the smoke level of CI Engine. Methods/Analysis: In CI Engines smoky exhaust and sluggish after burning (burning after the end of injection) results due to incomplete combustion of the products cracked during rapid combustion and gradual combustion in locally over-rich regions. Turbulence improves mixture formation and accelerates after burning reducing smoke. A present study employing turbulence assistance approach aims at improving fuel economy and lowering the smoke level. Findings: While highpressure secondary air is the turbulence provider, timing is achieved through microprocessor programming and related hardware. Timed turbulence closer to TDC helps in combustion and hence improved thermal efficiencies at all loads. Timed turbulence away from TDC during expansion accelerates ‘ After burning’ and reduces ‘smoke emission’. Encouraging results of the experiments with single and twin injections per cycle are reported. Also, the timing of turbulence has been optimized. Applications/Improvements: Timed turbulence may be attempted in auxiliary diesel power plants and in combined gas and diesel power plants for fuel economy and lower emission.

Keywords: CI Engine, Emissions, Fuel Economy, Timed Turbulence