R. Meyer J. Köhler A. Homburg Explosives

Bus Wire
and is then called Charbonnier’s Equation.
The parameter A = (S(0) V V(0)) V f(z) V ˙e(pref) /pa ref is called the
“vivacity” or “quickness” factor“.
The pressure exponent a typically has a value close to 1 for propellant
charge powder (burning rate at high pressure level). At low pressure
ranges (rocket burning rate) it can be brought close to zero (“plateau
burning rate”) or even less than zero (“mesa burning rate”) by suitable
additives to the propellant.
When the geometry of the propellant is known, the linear burning rate
and the pressure exponent of a propellant can be determined experimentally
in a W ballistic bomb.
If the gases flow continously out, as in the case of a rocket motor, the
pressure remains almost constant throughout the combustion period.
The linear burning rate and its variation with the temperature and
pressure may be determined in a W Crawford Bomb. The temperature
coefficient of the burning rate is the variation per degree of temperature
increase at constant pressure. The dependance on pressure
is characterized by the pressure exponent (see above).
For details on relevant theoretical and practical relationships see:
Barrère, Jaumotte, Fraeijs de Veubeke, Vandenkerckhove: “Raketenantriebe”,
Elsevier Publ. Co., Amsterdam 1961, p. 265ff.; Dadieu,
Damm, Schmidt: “Raketentreibstoffe”, Springer, Wien 1968.
Other relevant keywords are: W Solid Propellant Rockets, W Specific
Impulse, W Thermodynamic Calculation of Decomposition Reactions,
W Thrust.
Bus Wire
Antenne für Parallelschaltung; antenne pour le couplage en parallele
Two wires that form an extension of the lead line and connecting wire
and common to all caps in parallel. In parallel firing, each of the two
wires of each electric blasting cap is connected to a different bus wire.
For series in parallel firing each side of the series is connected to a
different bus wire (W Parallel Connection).
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