experimental
Experimental results of a systematic investigation on producer gas operated internal
combustion engine at higher compression ratio (CR) for the first time was reported by
Sridhar et al., (2001). The primary investigation was conducted on an engine of 24 kW
capacity. Experiments were conducted on a spark ignition (SI) engine converted from a
naturally aspirated, three-cylinder, direct injection diesel engine (RB 33 model) of
compression ratio (CR) 17. The knock sensitivity identifies the Highest Useful Compression
Ratio (HUCR) for most of the fuels having higher octane number. For higher-octane fuels, it
has been experimentally established that the upper limit of CR is 17 beyond which there is a
fall in efficiency (Caris & Nelson, 1959).