LASER IGNITION SYSTEM PDF
IJSRSET | Volume 2 | Issue 5 | Print ISSN: | Online ISSN: Themed Section: Engineering and Technology Laser Ignition System for. Laser Ignition System for an Internal Combustion Engine (continued) pdf&AD= ADA; cittadelmonte.info Laser ignition can enhance the combustion process and minimize Compared to a conventional spark plug, a laser ignition system should be a favorable.
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Although the cost and packaging complexities of the laser ignition systems have dramatically reduced to an affordable level for many applications, they are still. and applications of lasers for ignition of fuels are concisely reviewed from cost and packaging complexities of the laser ignition systems have. Laser Ignition System for IC Engines. Swapnil S. Harel1, Mohnish Khairnar2, Vipul Sonawane3. 1, 2Dr. Babasaheb Ambedkar Technical University, Lonere.
Economic as well as environmental constraints demand a further reduction in the fuelconsumption and the exhaust emissions of motor vehicles. At the moment, directInjected fuel engines show the highest potential in reducing fuel consumption and exhaust emissions. Unfortunately, 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 because otherwise severe damage will occur. Additionally, the spark plug electrodes can influence the gas flow inside the combustion chamber. ThisPlasma is heated by the incoming laser beam and a strong shock wave occurs. The expanding hot plasma can be used for the ignition of fuel-gas mixtures.
The excitedions meet photons when they return to normal state.
Thus very high energy is obtained inshort pulses. Ruby rod becomes less efficient at higher temperatures, so it is continuouslycooled with water, air or liquid nitrogen.
The Ruby rod is the lasing medium and flashtube pumps it. The process begins with multi-photon ionization of few gas molecules which releaseselectrons that readily absorb more photons via the inverse bremsstrahlung process toincrease their kinetic energy. Electrons liberated by this means collide with othermolecules and ionize them, leading to an electron avalanche, and breakdown of the gas.
Multiphoton absorption processes are usually essential for the initial stage of breakdownbecause the available photon energy at visible and near IR wavelengths is much smaller than the ionization energy.
LASER IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINE
For very short pulse duration few picoseconds themultiphoton processes alone must provide breakdown, since there is insufficient time forelectron-molecule collision to occur. Thus this avalanche of electrons and resultant ionscollide with each other producing immense heat hence creating plasma which issufficiently strong to ignite the fuel.
The wavelength of laser depend upon the absorptionproperties of the laser and the minimum energy required depends upon the number ofphotons required for producing the electron avalanche. The minimum ignition energy required for laser ignition is more than that for electric spark ignition because of following reasons: An initial comparison is useful for establishing the model requirements, and for identifying causes of the higher laser MIE.
Breakdown and heating of laser sparks depend only onthe gas, optical, and laser parameters, while the energy balance of spark dischargesdepends on the circuit, gas, and electrode characteristics.
The efficiency of energytransfer to near-threshold laser sparks is substantially lower than to electrical sparks, somore power is required to heat laser sparks.
Another reason is that, energy in the form of photons is wasted before the beam reach the focal point. Hence heating and ionizing the charge present in the path of laserbeam.
This can also be seen from the propagation of flame which propagates longitudinally along the laser beam.
Hence this loss of photons is another reason forhigher minimum energy required for laser ignition than that for electric spark. Laser Ignition System Published on Jan 10, More Seminar Topics: Are you interested in this topic.
Akash Modasara. Laser ignition is considered to be one of the most promising future ignition concepts for internal combustion engines.
It not only combines requirement of reduction of pollutant emissions but also improves engine efficiencies. In general, a well-defined ignition location and ignition time is of great importance for an IC engine.
Also the conventional ignition system cannot burn leaner air fuel mixture properly. In order to overcome the disadvantages of conventional ignition system, laser ignition system is researched upon.
Download the Seminar Report for Laser Ignition System
Also the Thermodynamic requirements of a high compression ratio and a high power density are fulfilled well by laser ignition system. This paper outlines progress made in recent research on laser ignited IC engines, discusses the potential advantages and control opportunities and considers the challenges faced, construction and working of laser ignitor and the system requirements for laser ignitor.
The igniting plasma is generated by a focussed pulsed laser beam. In order to generate the laser Nd: YAG as passive saturable absorber. There are four different ways in which laser light can interact with a combustible mixture to initiate an ignition event namely- 1. Thermal initiation, 2. Non resonant breakdown, 3.
Resonant breakdown, and 4.
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