NOTE: This dataset has to be interpreted in conjunction with the article below:

G. Mittal and C. J. Sung, “A Rapid Compression Machine for Chemical Kinetics Studies at Elevated Pressures and Temperatures,” Combustion Science and Technology 179 (3), 497-530 (2007). doi:10.1080/00102200600671898

Iso-Octane Autoignition

P0 = Initial pressure

T0 = Initial temperature

PC = Pressure at TDC

TC = Temperature at TDC

P0 = 331 torr

T0 = 297 K

Case #

Molar Composition iC8H18/O2/N2/Ar

PC (bar)

TC (K)

Ignition delay (ms)

1

1/12.5/47/0

13.2

686

57.6

2

1/12.5/37.6/9.4

13.7

713

66

3

1/12.5/28.2/18.8

14.15

745

95

4

1/12.5/18.8/28.2

14.8

782

119

5

1/12.5/9.4/37.6

15.35

826

104

6

1/12.5/0/47

16.1

878

36

Experimental pressure traces for case # 1 – 6: rcm_p-t-isooctane

Parameters for file hl.txt for case # 1 – 6: hl_isooctane

Simulation Procedure

  • Use the following program as the driver program for SENKIN: driver.f
  • Specify initial pressure (P0), temperature (T0), composition in the SENKIN input file with VTIM keyword for calculations.
  • Copy the file hl.txt, which contains parameters for heat loss, for the specific case in the program directory.
  • Run the program

Note: Heat loss parameters are in the form of a polynomial. At long time after compression the polynomial may blow up to erroneous values. SENKIN calculations should be performed to a reasonable time which is sufficient for ignition to occur.