10-08-2012, 04:53 PM
LASER INDUCED IGNITION OF GASOLINE D.I. ENGINES
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Economic as well as environmental constraints demand a further reduction in the fuel consumption and the exhaust emissions of motor vehiclesl . Conventional spark plug ignition shows a major disadvantage with modern spray-guided combustion processes since the ignition location cannot be chosen optimally. It is important that the spark plug electrodes are not hit by the injected fuel
LASER IGNITION SYSTEMS
Lasers provide intense and unidirectional beam of light. Laser light is monochromatic (one specific wavelength). Laser light has tight beam and is strong and concentrated. To make these three properties occur takes something called “Stimulated Emission”, in which photon emission is organized.
Main parts of laser are power supply, lasing medium and a pair of precisely aligned mirrors.
ADVANTAGES OF LASER INDUCED SPARK IGNITION
1 Location of spark plug is flexible as it does not require shielding from
immense heat and fuel spray and focal point can be made any where in the combustion chamber from any point It is possible to ignite inside the fuel spray as there is no physical component at ignition location.
2 It does not require maintenance to remove carbon deposits because of its self cleaning property.
3 Leaner mixtures can be burned as fuel ignition inside combustion chamber is also possible here certainty of fuel presence is very high.
4 High pressure and temperature does not affect the performance allowing
the use of high compression ratios.
5 Flame propagation is fast as multipoint fuel ignition is also possible.
6 Higher turbulence levels are not required due to above said advantages.