Engine Combustion Network

• ECN Home 
• Experimental Data 
• Constant-Volume Diesel Combustion 
• 1 Experimental Data Search 
• 2 Combustion Vessel Geometry 
• 3 Ambient Conditions 
• 4 Thermal & Velocity Distribution 
• 5 Injector Characterization 
• 6 Fuels 
• 7 Definitions 
• 8 Experimental Diagnostics 
  • 8.1 Soot 
  • 8.2 Jet Penetration 
  • 8.3 Liquid Penetration Length 
  • 8.4 Lift-Off Length 
  • 8.5 Ignition Delay 
  • 8.6 High-Speed Movies & Flow Visualization 
• Related Internet Sites 
• References 
• Tutorial: Diesel Spray Visualization

The first seven columns of the returned data are nominal search parameters. (Column numbers need updating LMP).

1. Ambient Oxygen Concentration [%], O₂
   Mole fraction of ambient oxygen in the vessel. Used for simulating the use of EGR or creating an inert (0% O₂) environment. Concentrations of other major species (N₂, CO₂, H₂O) .
2. Ambient Temperature [K], T_a
   Gas temperature of the core region of the vessel. Uniformity of core temperature.
3. Ambient Density [kg/m³], ρ_a
   Gas density of the core region of the vessel.
4. Nozzle Size or Orifice Diameter [mm], d
   Smallest diameter of injector nozzle. Detailed description of injector tips and orifice flow coefficients.
5. Injection Pressure Above Ambient [MPa], DP_inj
   Difference between fuel injector pressure and ambient gas pressure.
6. Fuel Type
   Fuel properties.
7. Fuel Temperature [K], T_fl
   
8. Liquid Length [mm]
   The maximum extent of liquid-phase spray penetration during injection. Description of liquid-length measurement.
9. Lift-Off Length [mm]
   Axial distance from injector to location of high-temperature reaction. Description of lift-off length measurement.
10. Ambient Temperature After Ignition [K]
    Calculated ambient temperature after ignition and premixed burn compress unmixed ambient gases. Although the difference from the ambient temperature at start of ignition is typically small, this temperature is useful for evaluation of ambient temperature for diagnostics performed after ignition such as lift-off length or soot measurements. Further description.
11. Ambient Density After Ignition [kg/m³]
    Calculated ambient density after ignition and premixed burn compress unmixed ambient gases.
12. Ignition Delay [ms]
    Time difference from start of injection, now defined as the time when spray first leaves the injector, until high-temperature (rather than first-stage) ignition and combustion (the premixed burn). Detailed description.
13. Estimated Injection Duration [ms]
    Average injection duration determined by attenuation of HeNe laser positioned 7 mm in front of injector.
14. Estimated Injection Mass [ms]
    Injected mass estimated from measured injection duration, and using injector calibration. See Equation 4 from here. Injector opening and closing effects are included by subtracting 0.15 ms from the measured injection duration for use in Eq. 4.
15. Ambient Pressure [MPa], P
16. Ambient Compressibility Factor , Z
    
P=Z·R·ρ_a·T_a
17. Bulk Temperature [K], T_b
    Mass-averaged bulk temperature (T_b) determined from the real-gas equation of state (P = Z · R · ρ · T_b /MW), where ρ is constant for a given experiment and P is pressure. Detailed description
18. Bulk Density [kg/m3], ρ_b
    Mass-averaged bulk density. The initial density of combustion vessel charge, prior to preburn and diesel injection. Bulk density is constant for a given experimental simulation.
19. Number of runs
    Number of injections used to compute average quantities in the database, including the pressure rise versus time.
20. Pressure Rise [MPa]
    Text file giving the measured pressure minus an extrapolation of the pressure in the vessel during cool-down. Time is relative to the start of injection [ms]. Gives the pressure change caused by vaporization and combustion of the diesel jet. Detailed description.
21. Soot Volume Fraction [ppm]
    Three tab-delimited text files giving the soot volume fraction distribution of the jet cross-section. Soot volume fraction file has units of parts-per-million (ppm). Axial distance, x, and radial distance, y, files have units of mm. The dimensions of the soot volume fraction array match the axial and radial dimensions, respectively. Detailed description of soot measurement.
22. High-Speed Movies
    Links to movies of chemiluminescence, soot, shadowgraph, or liquid scatter measurements.
23. Jet Penetration
    Tab-delimited text file giving the penetration distance of the jet/vapor boundary versus time.
    Detailed description.
24. Additional Files
    Additional data and description for a given condition.

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