The state-of-art optical diagnostics for in-cylinder combustion analysis
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- 26 May 2021
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Duration:
2015-2018
Project Details:
Design and development of advanced combustion chambers for low emission IC engines rely on increasing extent on experimental data on flowfield properties obtained for in-cylinder combustion process. These data mainly comprise distributions of spray, soot, relevant molecular and radical species, velocity fields, and temperature fields. The measurement data could help improve understanding of the engine combustion process and also serve as model validation. Optical diagnostics provide useful techniques in obtaining these data.
Table 1 summarises the available optical diagnostics for in-cylinder combustion analysis. To facilitate many of these diagnostics usually require multiple optical accesses and advanced laser and camera systems. However, part of these measurements can also be resolved with carefully designed endoscopic system.
Endoscopic imaging techniques allow real-time in-situ measurements of multiple species and flow characteristics of IC engines in-cylinder combustion process, which has been successfully applied to both SI and DI engines analysis to optimise low-carbon emission performances.
Table 1. Optical diagnostics for in-cylinder combustion analysis
| Parameters | Optical method | Point/ Planar | Laser and camera system | Ref. |
|---|---|---|---|---|
| Spray | ||||
| Liquid penetration length Flame lift-off length Light-based ignition delay Liquid-vapour visualization | Diffuse back imaging (DBI), Mie scattering OH* chemiluminescence OH* chemiluminescence Laser Absorption-Scattering (LAS) | Planar Planar Planar/Integral Planar | Laser/LED, high speed camera UV intensified camera UV intensified camera UV-Vis laser, intensified camera | CV [3,4], ODE [5] CV [6,7], ODE [8]CV [9,10], ODE [11] CV [24] |
| Soot | ||||
| Volume fraction (fv)KL factor, fvKL factor | LII/TC-LII,TR-LIILaser extinctionTwo-colour pyrometry | Planar/pointLine-of-sightPlanar | Vis-NIR laser, ICCD, PMTsVis laser, PDPMTs | ODE [46-52];ODE [38];ODE [27], DE [22-24]; |
| Temperature | Two-colour pyrometry Two-line LIFCARS | Planar & line-of-sightPlanarPoint | Image intensifier, digital camera; amplified PD2 × UV pulsed laser, ICCDNd:YAG laser, Dye laser, Monochromater | ODE [27],DE [22-24]OGE [54-58]OGE [64-67]; ODE [68] |
| AFR | Rayleigh scatteringLIBSOH*/CH* | PlanarPointPlanar/line-of-sight | Vis laser, ICCDPulsed laser, spectrometerPMTs | ODE [82, 83]OGE [87]/ |
| Combustion process and species | ||||
| Reaction frontIgnition-site/delayNO concentrationLight based heat release | OH-PLIFCH2O-PLIFNO-PLIF OH* chemiluminescence | PlanarPlanarPlanar Planar/Integral | Pump laser, dye laser, ICCDUV laser, ICCDPump laser, dye laser, ICCD ICCD | ODE [91, 92]ODE [97]ODE [98-104] ODE [24] |
| Flow structure | PIV | Planar | Double pulsed laser, camera | ODE [106-112] |
Combustion vessel (CV); Optical Diesel engine (ODE); Diesel engine (DE); Optical gasoline engine (OGE)
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