R. Meyer J. Köhler A. Homburg Explosives

293 Squib
Hc: enthalpy of the reaction products Unit:
in the rocket kcal/kg
chamber
(at chamber pressure and chamber temperature)
He: enthalpy of the reaction productsat the nozzle kcal/kg
exit.
The equation can be solved with the aid of computers, considering
various equilibrium reactions; W Thermodynamic Calculation of Decomposition
Reactions.
The relation of the specific impulse to the temperature of the reaction
gas in the rocket chamber is
Tc: flame temperature in the chamber
N: number of moles per weight unit
M: average molecular weight of the flame gases
k1; k2: constants
The value for the specific impulse is high if the reaction heat is high
and produces a high flame temperature, and if the average molecular
weight of the reaction products is low. Data concerning specific impulses
are only comparable if they refer to the same working pressure
in the combustion chamber; a frequently employed standard value is
1000 lbs/sq. in. approx. 70 bar in test chambers.
For more details on this subject, see: Barrére, Jaumotte, Fraeijs de
Veubeke Vandenkerckhove: Raketenantriebe. Elsevier, Amsterdam,
1961. Also: Dadieu, Damm, Schmidt: Raketentreibstoffe Springer,
Wien 1968; also W Gas Jet Velocity and W Thermodynamic Calculation
of Decomposition Reactions.
Springing
Vorkesseln; agrandissement par explosion
The practice of enlarging the bottom of a blast hole by the use of a
relatively small charge of explosive material. Typically used in order
that a larger charge of explosive material can be loaded in a subsequent
blast in the same borehole.
Squib
Anzünder; allumeur (électrique)
Used in a general sense to mean any of the various small size
pyrotechnic or explosive devices. Specifically, a small explosive device,