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Resolution of Annealing Experiments for the Study of Nonequilibrium States
The two techniques for conducting annealing experiments for the purpose of determining the distribution of atoms of a solid among non equilibrium states are considered. Related definitions for resolving power for annealing with steadily rising temperature and for annealing at a series of fixed temperatures are given. The necessary separation of activation energies for the resolution of two different non equilibrium states is found to be greater in the case of a steadily rising temperature, but of the order of 10 percent of the activation energy for both techniques. The resolving power in the case of a steadily rising temperature is independent of the rate of temperature rise.
Date:
September 27, 1951
Creator:
Schwed, Philip
System:
The UNT Digital Library
Combustion Instability in an Acid-Heptane Rocket with a Pressurized-Gas Propellant Pumping System
Results of experimental measurements of low-frequency combustion instability of a 300-pound thrust acid-heptane rocket engine were compared to the trends predicted by an analysis of combustion instability in a rocket engine with a pressurized-gas propellant pumping system. The simplified analysis, which assumes a monopropellant model, was based on the concept of a combustion the delay occurring from the moment of propellant injection to the moment of propellant combustion. This combustion time delay was experimentally measured; the experimental values were of approximately half the magnitude predicted by the analysis.
Date:
September 27, 1951
Creator:
Tischler, Adelbert O. & Bellman, Donald R.
System:
The UNT Digital Library