From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Pressure-time curves and flame propagation for designing smooth combustion chambers.
| Identifier | ExFiles\Box 133\1\ scan0260 | |
| Date | 21th July 1937 | |
| -7- (11) (12) Another point about pressure-time curves is that the first derivative of the curves gives the area of the flame front which is a partial measure of the rate of burning, though the flame speed should also be taken into account. It is observed, however, that by bringing the maximum area of the flame front early in the burning, optimum smoothness is obtained, thus a good rule for designing smooth combustion chambers is - burn half the volume ~~the volume~~ of the charge as quickly as possible. The result of getting the flame off to a good start appears to be accomplished by distributing the volume so that the maximum rate of flame propagation occurs at about one third of the flame travel. SYNTHESIS OF PRESSURE-TIME CURVES. Now if the volume of charge burned were a lineal function of the distance travelled by the flame, then Equ.2. would apply equally well to the variation of volume burned, or flame travel in time. However, as this is not the case, Equ.2. is better considered as applying only to flame travel. | ||