A Study of The Flame Development and Rapid Burn Durations In A Lean-Burn Fuel Injected Natural Gas S.I. Engine

Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine

“…Lean mixtures of alternative fuels such as natural gas, biofuels and fuel-blends, with operational modes such as direct injection (DI) and homogeneous charge compression ignition (HCCI) have been realized in recent years, with improved performance over the conventional gasoline and diesel engines [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, internal combustion engines suffer from cycle-to-cycle variations (CCV) in combustion variables such as pressure, and these cyclic variations may become severe under lean burn conditions or for highly dilute mixtures with exhaust gas recirculation (EGR) [16][17][18][19][20]. The CCV may lead to reduced engine output and operational instabilities [21][22][23].…”

Analysis of pressure fluctuations in a natural gas engine under lean burn conditions

“…Using the methods of nonlinear dynamics and other techniques, researchers have investigated the complex dynamics of pressure fluctuations in these engines, including the possibility of chaotic oscillations [10][11][12][13][14][15][16]. The dynamics of pressure variations in natural gas-fired engines have also been analyzed by similar methods [19][20][21][22][23].…”

Combustion Characteristics of Methane in A Direct Injection Engine Using Spark Plug Fuel Injector

“…The combustion durations for direct injection of natural gas is shorter than those of port injection as reported earlier (Huang et al 2003& Hassaneen et al 1998. The time between injection and ignition also has strong effect on the combustion behavior, and subsequently, the engine performance (Zeng et al 2006).…”

“…Direct injection natural gas has the potential of achieving the specific fuel consumption equivalent to those of diesel engines over a broad range of load, speed and output power (Goto 1999;Huang 2003& Zeng 2006. Moreover, the combustion from direct injection is faster than those of carburetion and port injection, which is advantageous (Hassaneen et al 1998). This paper presents results of investigations on methane (main constituent of natural gas) burning rate of a newly developed natural gas/methane direct injection using spark plug fuel injector (SPFI) for low cost conversion from port injection or carburetion to direct injection.…”