Chemistry Reference
In-Depth Information
and various zones of the contact are always burned out. Due to the periodic nature
of the contact between the condensed phases, one cannot use Cantrell's expres-
sions (1.56) to calculate the geometry of the unsteady gas gap in the “end-to-end”
technique.
In order to study some important features of the burning mechanisms of model
and real materials, one should use an experimental method that applies in the
absence of contact (and interaction) between the condensed phases, where linear
pyrolysis occurs due to the gas flame resulting from the reaction between the prod-
ucts of linear pyrolysis. This is especially important when identifying the effective
zone for catalysts of composite solid propellant burning. The simplest method that
meets all necessary requirements is the chemical arc technique proposed by the
author [16].
The chemical arc technique is quite efficient for measuring and comparing lo-
cal linear pyrolysis rates under conditions of parallel burning of composite solid
propellant components in the absence of contact between their condensed phases.
These data can be used to determine general patterns for linear pyrolysis of com-
posite solid propellants in the burning mode and to analyze some specific aspects
of the burning mechanism (in particular, the role and “sites of action” of basic
b
Fig. 2.7
Chemical arc installation. Schematic of the main unit (
a
):
1
, frame;
2
, static sample;
3
, moving sample;
4
, sliding unit;
5
, actuating screw;
6
, clasp nut;
7
, electromotor. Photo of the
main unit (
b
)
