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National Advisory Committee for Aeronautics, Report - A Constant Pressure Bomb

This report describes a new optical method of unusual simplicity and good accuracy suit»-
able to the study of the kinetics of explosive gaseous reactions; it deals With a part of an
investigation of the rates of explosive gaseous reactions being carried out at the Bureau of
Standards at the request of and with the support of the National Advisory Committee for
Aeronautics.

The device is the complement of the spherical bomb of constant volume, and extends the
applicability of the relationship, pv= nRT for gaseous equilibrium conditions} to the use of both
factors p anc v.

The method substitutes for the mechanical complications of a manometer placed at some
distance from the seat of reaction the possibility of allowing the radiant edects of the reaction
to record themselves directly upon a sensitive film.

It is possible the device may be of use in the study of the photo-chemical effects of radiation.
The method makes possible a greater precision in the measurement of normal flame veloci-
ties t-han was previously possible.

An application of the method in the investigation of the relationship between flame velocity
and the concentration of the reacting components, for the simple reaction 200+03‘fiz9002,
shows that the equation 7c=—-i—— describes the reaction.

An approximate analysis shows that the increase of pressure and density ahead of the
flame is negligible until the velocity of the flame approaches that of sound.

In the study of the reactions of explosive gaseous mixtures a number of methods have
been developed suitable to the particular end in view. For the most part- these investigations
have followed one or the other of two well-defined directions: _A study of the equilibrium con-
ditions of the reactions; or a study of the kinetics of the problem.