In a special test assembly (lambda = 1, laminar flow, ambient pressure, ambient temperature) you get for flame front velocity (sorry for german notations):Holding everything else constant ... how much timing difference can someone expect to see by going from the slowest burning gasoline to the fastest burning gasoline?
Methanol: 42 cm/s
Propan: 40 cm/s
Benzin: 33 cm/s
Methan: 38 cm/s
If you calculate now, keep in mind, that tese different combustibles need different CRs.
Charge homogeneity isn't normally a parameter you're contolling in a reasonable way.Holding everything else constant ... how much timing difference can someone expect to see by going from the least homogeneous burnable charge mixture to the most homogeneous burnable charge mixture?
Drop size and stake of fully evaporated fuel are more a result of the used injectors, wall temperatures, charge velocity and injection strategy (resting time of sprayed fuel while inlet valve closed).
Depending on engine operating point, I would guess up to 10° CA.Holding everything else constant ... how much timing difference can someone expect to see by going from the leanest burnable charge mixture to the richest burnable charge mixture?
This you can read off the timing diagram (advance angle over engine speed and load) of your special engine.Holding everything else constant ... how much timing difference can someone expect to see by going from the least dense burnable charge mixture to the most dense burnable charge mixture?
Choose an engine operating point and look for advance angle variance at constant engine speed (in german "Drehzahlschnitt").
GJ