* Class 2L: lower burning velocity
(BV) Class 2s with burning velocities less than or equal to 10 cm/s (3.9 in./s); and
 presented an equation that includes the effect of the mass of venting devices and laminar burning velocity
of combustible mixture inside cylindrical and rectangular vessels with volumes varying from 0.009 [m.sup.3] to 0.09 [m.sup.3].
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.