What is the significance of mach number, pressure and velocity variation profiles?
I read a lot of papers on spray modeling using different software packages like Kiva, Star CD etc. what's the exact role of this modeling in combustion modeling?
Your question is too general, I can only suggest a reading on basic textbooks of gasdynamics (for example Zucrow). Then, go to to the topic of the combustion (that can happens also at very low-mach)
Mach number is used to compare the flow velocity with local speed of sound, pretty significant in a gas turbine as formation of shockwaves could pose unwanted situation. Pressure plays a very significant role in any combustion, if the pressure before the combustion is high, the work output (expansion) will also increase.
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