* Class 2L: lower
burning velocity (BV) Class 2s with burning velocities less than or equal to 10 cm/s (3.9 in./s); and
As all of the air for combustion is pre-mixed with the fuel prior to combustion taking place, this increases the
burning velocity and consequently produces a smaller, more compact high-temperature flame than that of an atmospheric burner.
Also, maximum
burning velocity decreases with increased carbon atoms in the fuels.
where [T.sub.f], [V.sub.u] represent maximum temperature and the
burning velocity of the propagated flame in a combustible mixture of organic fuel particles, respectively.
For
burning velocity measurement, a number of techniques have been developed.
As shown in Table 1, refrigerants that have a
burning velocity (BV) of 10 cm/sec or less, defined by ASHRAE 34, fall into Class 2L.
- A compact combustion chamber design incorporates
burning velocity and cooling performance suitable for an engine that emphasizes torque characteristics in the rpm ranges actually used by a 125cc scooter.