Fig 1.
Flame binarization image processing flow.
Fig 2.
Fractal dimension of flame based on box counting method.
Table 1.
Physical parameters of engine lubricating oil.
Fig 3.
Experimental bench and corresponding facility.
Table 2.
Experimental Conditions of Fixed Spray hole diameter.
Table 3.
Experimental condition of fixed oil drop volume.
Fig 4.
Schematic diagram of experimental injector size.
Fig 5.
Ignition delay process shot by high-speed camera.
Fig 6.
Variation of heat flow with wall temperature.
Fig 7.
Droplet boiling modes at different temperatures.
Table 4.
Average ignition delay time in each temperature range.
Table 5.
Global average ignition delay time of oil droplets with volume of 0.1-0.5ml.
Table 6.
Global average ignition delay time of oil droplets with diameter of 0.4-0.7 mm.
Fig 8.
Relationship between hot surface temperature and ignition delay time.
Fig 9.
Relationship between fuel quantity and ignition delay time.
Fig 10.
Relationship between ignition delay time and spray hole diameter.
Fig 11.
Relationship between Hot Surface Temperature and Ignition Event.
Fig 12.
Risk Classification Diagram of Hot Surface.
Fig 13.
Three classic combustion stages of the flame.
Fig 14.
Evolution of flame fractal dimension of oil droplets with different volumes.
Fig 15.
Fractal dimension evolution of oil droplet flame under different spray hole diameter.