burning velocity

burning velocity

[′bər·niŋ və′läs·əd·ē]
(chemistry)
The normal velocity of the region of combustion reaction (reaction zone) relative to nonturbulent unburned gas, in the combustion of a flammable mixture.

flame spread

Flaming combustion along a surface (not to be confused with the transfer of flame by air currents).
References in periodicals archive ?
The fact that cooled EGR leads to a decrease in laminar burning velocity is well known.
Further, the faster laminar burning velocity of methanol [4] could sustain higher levels of dilution in the engine.
* Class 2L: lower burning velocity (BV) Class 2s with burning velocities less than or equal to 10 cm/s (3.9 in./s); and
[14] 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.
- the nature of the gaseous environment, with the aim of classifying the optical hazard of the atmosphere in terms analogous to the electrical case, and of investigating thoroughly the minimum ignition energy, the auto ignition temperature and the burning velocity.
Flammability limits (LFL, UFL) and the laminar burning velocity are important for the evaluation of the flammable cloud geometry and for its fundamental reactivity.
- 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.