Calculating the VoD's of compositions

[Hinckleyforpresident]

I am curious if there is any way to calculate (other than measuring) the approximate VoD of an explosive composition such as ANFO’s, blasting gels, dynamites, etc. I am curious how the change in the VoD behaves with changes in density, oxygen balance, etc.

I don’t imagine it would just be the mean VoD. Am I wrong?

Does anybody know of such a formula or set of formulas? I have found formulas for chemically pure substances, but not mixes.

[Exothermic]

I have seen an equation in my 'chemistry of explosives' book. I will write it out and see if you can make more sense of it then I could.

Vpx = 430(nTd)1/2 + 3500(Px - 1)

Vpx is the velocity of detonation at a given density (Px), n is the number of moles per gram of gaseous products that produced during detonation and Td is the approx. temperature of detonation in Kelvin.

Edit:
Ok, I had a go at the equation to see if it works. I used propane 1, 2, 3 tryl trinitrate as the explosive to measure.

1/227 = 4.4x10-3 moles -----------> Litres of gas = 4.4x10-3 x 24,000 ----> Volume= 105.7cm3 of gas produced from 1g of N.G detonating.

430(4.4x10-3 x 15.1kJ) /2 + 3500(1.6 - 1)
Vpx= 16384fps (I'm guessing it is in feet per second the book never stated the unit.)

Converted Mps: 16384 x 0.3048 = 4994mps

Overall, the calculation seemed fairly ok. However the end result is a bit disappointing as I know the VOD of N.G. is around 7700m/s.