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Indian Institute of Technology Kanpur

Kanpur, India (208016)


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Performance, Combustion and Emission Analysis of Gasoline Direct Injection Engine

Gasoline direct injection engines have become popular powertrains for passenger car segment worldwide. The technology is known for its characteristics of high power output, greater thermal efficiency and improved fuel economy. Due to its capability of being operated under two combustion mode by varying the fuel injection timing, it is emerging as a widely adopted engine technology. GDI has two combustion concepts: stratified charge operation (Part load) and homogeneous stoichiometric operation (Full load). In stratified charge operation, fuel is injected late in the compression stroke creating a rich mixture near the spark plug and overall the mixture is lean. In homogeneous stoichiometric operation, fuel is injected early in the intake stroke so that homogeneous mixture is created inside the combustion chamber. We can use homogenous mode during high torque requirement and stratified charge mode during low torque requirement. In ERL, the homogenous mode of combustion has been explored. A comprehensive set of experiments were conducted to understand the inter-relationships between gasohols and baseline gasoline in a GDI engine. In this context, three gasohols (15% (v/v) blends of methanol/ethanol/butanol with 85% (v/v) gasoline were investigated.

  • Macroscopic and microscopic spray characteristics of gasohols and baseline gasoline were carried out.

  • Engine performance, combustion and emission characteristics of GDI engine were investigated at different operating conditions.

  • Detailed particulate morphology characterization was carried out which included ICP-OES, FE-SEM, HETEM, FTIR and Raman Spectroscopy.

  • Implementation of Phase Doppler Interferometry (PDI) in an optical engine to find real time spray droplet velocity-diameter distributions at optimum engine operating conditions.

  • Different primary alcohols were compared for combustion, performance and emissions characterisation in dual fuel injection mode, where alcohols were injected in port and gasoline was injected directly into the cylinder

Optical investigation for combustion analysis in homogeneous and stratified mode of operation can be done for further detailed investigation and optimizing the engine performance.


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Last updated on 1st March, 2020