Benjamin Franklin & CFD - Cham

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Philadelphia CFD ConferenceSome uses of the TR-MIX diagram;mixture propertiesApril 2010Our Returned Benjamin Franklin (RBF from now on) will certainly wantto visualize the composition of the gas population in its possible states.Here are the distributions ofunburned fuel (left) and freeoxygen (right). Red is high,blue low, in all cases.Here is the(adiabatic) gastemperature (right)and finally theconcentration ofcombustionproducts (right).and thereactedness(left);Of course otherproperties such asdensity and viscositycan also be computedand displayed.
Philadelphia CFD ConferenceSome uses of the TRI-MIX diagram;chemical-reaction ratesApril 2010Svante Arrhenius, 100 years after Priestley and Lavoisier,explained why combustion reactions proceed fastest at hightemperatures. His findings can also be expressed by way ofcontours on the TRI-MIX diagram.There are three kinds of reaction, of which the rate-contours are shownbelow (red is high rate; blue is low rate):1. the main energy-producing oxidation of the fuel,which is what we desire to promote;2. the undesired reaction producing oxides ofnitrogen; and3. the almost equally undesired smoke-creating reaction(although light emanating from Franklin‟s oil lamp doesneed the presence of some carbon particles).
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Benjamin Franklin & CFD - Cham

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