β Scribed by Claus Breuer
No coin nor oath required. For personal study only.
The description of the heat release of DI-diesel engines by means of the double-Vibe-model leads to a strong analogy with only six free parameters. Thus, a calculation method has been worked out according to Vibe's proposal of the 'logarithmic anamorphosis' for simple Vibe-functions. This method allows, contrary to conventional methods, the determination of all six parameters from experimental data independently of any assumptions made before. It also shows shorter calculation times. The reliability of the process has been verified by using the data of 54 test runs ofa DI-diesel engine using gas oil and rape-oil as well as rape methyl ester. A dependency between fuel properties and Vibe-parameters has been proved. Boiling characteristic, fuel viscosity and also the cetane number control the premixed and the diffusion combustion phase. The premixed combustion phase is influenced by the ignition delay and the atomization quality, the diffusion combustion phase is primarily formed by the amount of converted fuel.
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