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spray angle calculation

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Old   August 7, 2008, 22:10
Default spray angle calculation
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In the Huh's model, spray angle is calculated automatically.

There is equations about spray angle in the methodology.

but nothing about the time scale of wave growth(Tau w).

I cannot get the exact spray angle.

anyone give me hint?? plz

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Old   August 13, 2008, 10:34
Default Re: spray angle calculation
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In Huh's atomization model you have:
Atomization-time-scale = C3 * Turbulent-time-scale + C4 * Wave-growth-time-scale.
This latter is computed as ((ro*ro_fuel/(ro+ro_fuel)^2)*(cd/Lw)^2-sigma_f/((ro+ro_fuel)*Lw^3))^(-0.5)
where ro = density (air has no subscript), cd = fluid velocity at injector outlet, Lw = C1/C2 * Turbulent-legth-scale(time varying...!). I think it's pretty complicated to have all the data to verify the code computation...if you want I can give you values of costant C1,2,3,4...
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