Abstract
In the case of the flame in which gas and air flow upward through separate tubes, it was confirmed that: (a) The greater the port velocity of air and the width of air port with a constant gas velocity, the shorter the flame. (b) The burning velocity of gas is also governed by the rate of mixing of gas and air. Therefore, from the same consideration as before we can easily obtain the equation expressing the mean concentration of combustible gases.
By using the experimental formula representing the relation between the length of the flame and the gas port velocity, air port velocity, diameter of gas port and the width of air port, the expression for the mean concentration of gases in the flame was simplifyed. Thus the heat of liberation in the flame can, easily be determined. Combining the value so obtained and the heat transmitted from the flame, the flame temperature is calculated. A comparison of the observed temperature indicates a fairly good agreement with the calculated value.
In order to determine the effect of the direction of flame on the burning velocity, the study of the horizontal flame was carried out. It was confirmed that the rate of combustion of gas is also governed by the same basic principles as before. Hence, on the base of the same procedure as described in the vertical flame the concentration of combustible gases in the flame and the flame temperature were calculated.
In burning coal gas in a small furnace, the flame length decreases with the increasing amount of air and constant gas velocity. With the constant aeration, however, it is almost indepent of the amount of gas, that is, even if the amount of gas increases with the constant aeration, the length of flame does not change.
