Encyclopaedia Index

TITLE : EXPLOSION IN A BAFFLED ENCLOSURE

BY: D J FREEMAN - CHAM Development Team

PHOENICS VERSION: 2.1

DATE: SEPTEMBER 1995

DETAILS :

The Multi-Fluid Turbulent Combustion (MFTC) Model:

The Multi-Fluid Turbulent Combustion Model (cont.)

  • The four fluids used in this simulation were: A, comprising of fully unburned fuel/air mixture, B, a mixture of unburned gas and products at a temperature too low for chemical combustion to proceed, C, the same mixture but at a temperature at which the chemical rate is significant, and D, fully burned gas.

  • A and D mix to form B and C, while A mixes with C and B with D to form B and C respectively. C reacts to form D.

  • The overall rate of combustion therefore depends on the mixing rate and the rate of reaction.

  • The effect of changing the mixing rate constants was investigated in this work.

    Pictures are as follows:


    1. Contours of constant flame front arrival time (low value of CMIX)


    2. Contours of constant flame front arrival time (medium value of CMIX)


    3. Contours of constant flame front arrival time (high value of CMIX)


    4. Preliminary simulation: Concentration contours of A


    5. Preliminary simulation: Concentration contours of B


    6. Preliminary simulation: Concentration contours of C


    7. Preliminary simulation: Concentration contours of D

    8. Full simulation: Concentration contours of D (products)showing the development of the flame front with time:


    at 60 and 80 microseconds


    at 100 and 120 microseconds


    at 140 and 160 microseconds

    DISCUSSION

    wbs