Lasers in combustion: from basic theory to practical devices

摘要

In recent years,a large number of linear and nonlinear laser-based diagnostic techniques for nonintrusive measurements of sepcies concentraitions,temepratures,and gas velocities in a wide pressure and temperature range with high temporal and spatial resolution were developed and have become extremely valuable tools to study many aspects of combution.Modern "pump-probe" laser spctroscopic mehtods give driect insight into the microscopic dynamics,product channel distributions,and reaction reates of elementary combustion reactions over a wide range of temerpatures and pressures.Nonlinear laer spectroscoopic techniques using infrared-isibkle sum-frequency generation can now bridge the pressure and materials gap to provide kinetic dat afor ctalytic combustion.olaminar flames are ideal objeicts to develop the application of laser sepctroscopic mehtods for practical =combustion systems and tto test and imporve gas-phase reaction metchanism in combustion models.Bvesiddes diagniostics,laers can also provide well defined starting ocnditiosn for detailed experiemntal and theorieticla studies of ignition processes.Non intrusie laser point and field measurements,especially joint velocity-scalar data at the same point in space and time,are of basic importance in the vaildation and furthe rdevelopment of turbulent ocmpustion models.As an area for the applciation fo quanitative lase spectroscopy to practical combustion devices,investigations in internal combustion engines are described.Finally,the potential of laer techniques fro active ocmbustion contorl in various deivces from laoratory hurners to full-scale jet engines,municipal waste incrinerators,kand pressurized fluidized-bed reactiors are illstrated.