The Research Of Ballistic Photon Imaging Method In Spray Field For Engine

In the engine,the atomization of fuel,is indispensable condition to produce high quality combustion.The key to achieve this goal is making the fuel produce good atomization by the nozzle of engine,therefore,the atomization of the spray field measurement is of great significance to the design of the engine.Due to the current measurement techniques can’t meet the measurement requirements of atomized fuel injection of engine in near-field region（the zone of initial crushing atomization）,but it’s important to the design of the engine.This paper carried out a measurement technology on liquid atomization which has high resolution and high contrast--the ballistic photons time gating measurement technology.First we have completed the research of Ballistic photon time-gating methods,analyzed the time characteristic and intensity of the ballistic photons which through the dense spray field,and the theoretical foundation based on the optical Kerr effect to realize time gating.Then we completed the design and argumentation of overall systems and subsystems.Secondly,we have completed the research of Ballistic photon time-gating methods,and developed Ballistic photon strobed modules,mainly composed of imaging optics and optical Kerr gate.Its main function is picked out ballistic photons which carried the information of spray field.Optical Kerr gate which use the optical Kerr effect of CS₂ and high precision optical delay technique can increased the contrast of atomization images from 10% to more than 60%and meet the needs of imaging measurement for dense atomization field.The collected gate-width of ballistic photons can achieve 1.5 ps.At last,we have done some imaging measurement research about near-field region of jet atomization formed in Like-triplet injector and coaxial injector by Self-developed Ballistic photon strobed imaging measurement modules for atomization.The spray images obtained by it clearly show information about liquid core break up and its process.The filaments,big droplets and the holes in liquid core is clearly visible.Its proves that this technology can realize imaging measurement for the spray field and fill the blank of imaging measurement for dense spray field in domestic.