I'm trying to simulate pulsejet engine combustion using a matlab code, but i'm stuck at the combustion phase.
1) I should use "G. PACZKO, P.M. LEFDAL AND N. PETERS" mechanism mentioned in (REDUCED REACTION SCHEMES FOR METHANE, METHANOL AND PROPANE FLAMES), the problem here is i don't know how to implement a reduced chemical kinetic mechanism using the paper's definitions (global reaction rate and how to relate it to the molar concentrations of the species variation with time) ?
2) How do i implement that chemical mechanism in NS equations ? when to call it, what does it need as inputs, what will it give me as outputs, .. etc.
Any help would be so appreciated.
Thanks all
Hello,
writing a new solver for chemical systems is really complicated. There are several open source and closed source solvers for this. E.g. Canterra, Chemkin, LOGEsoft, ... . 100 000 hours if developement time have been spent making them fast and robust. You should really consider using one of those solvers.
Thank you Dr. Lars Seidel for your quick reply,
Even if i want just to perform a quasi 1d analysis to my problem ?
Hello, i do not know how a quasi 1d analysis of pulse jet should look like. Since there are pulses of combustion you would need a proper time resolved solver. Due to the nature of the different phases you would need to resolve chemistry in transients, though you need a fast solver which could adapt its time step size. Even if you are able to write (or use an existing solver in Matlab) for ODEs it will be very slow. Depending on which model (reaction mechanism) you are going to use to model the fuels it will very likely become very very slow. So slow that you can not do any model development with this.
I admit they i never modelled a pulse jet myself, but my knowledge is based on modelling flames, engines and furnaces in different models from 0D to 3D. I also worked with difference solvers a lot. If you want to solve chemistry on the fly, is strongly suggest you use an already developed chemistry solver. Writing your own will need all your worktime and you will have no time working on the actual model.
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