|August 21, 2008, 17:55||
shell auto ignition
hi , i am trying to solve a case in starcd where in i am using shell auto ignition (i want fuel to ignite only when it reaches certain temperature zone) . i have defined a single step reaction with C8h18 . its an exothermic reaction.
my observation is
Products are formed immediately once comes in contact with oxygen (like in PPDF method). I was expecting after the "start conbustion Time " is reached it should occur @ high temperature zones only.
I dont see reactants (fuel, scalar ) reducing. If i plot fuel and products they show high value @ same location.
Temperature is not increasing as a result of reaction. there is no increase in domain rather it reduces.
Can any body suggest any thing about it ? More over can any body suggest some method for temperature specified auto ignition where in fuel will ignite @ specified temperature.
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