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- W241429581 abstract "Basic studies performed during the second year of a two-year program to evaluate the adaptability of the high-intensity arc flame as a testing medium are described. A more stable and controllable configuration of arc operation, featuring a triple cathode, was developed. The pulse methed of measuring tail flame velocity was improved aud the range of measurements extended by using a more powerful electronic pulsing device. A definite peak in the curve of instantaneous velocity versus axial distance along the flame was observed which appeared to shift farther away from the crater as the ambient pressure is reduced. The maximum velocity achieved was approximately 70,000 cm/sec. The mass density of the flame was measured by means of a dynamometric technique using a disk-shaped model. The results showed a wide discrepancy with values predicted from the ideal gas law. Extensive heat flux measurements were made by calorimetric methods to determine the rate of energy absorption as a function of power input, ambient pressure, and location. The maximum heat absorption rate measured was 1.5 kw/cm/sup 2/. Abnormally high heat transfer coefficients were indicated for surfaces in contact with more » a plasma flame. A photodensitometer method was used to indicate temperature gradients within the flame. These results and earlier temperature measurements are discussed. Several flow visualization techniques were utilized to determine flow patterns of the arc plasma in the vicinity of solid objects. Direct and schlieren photography showed an abnormally thick boundry layer for the flow of plasma near the models; a possible explanation is offered. Finally, attempts were made to measure thermal diffusivities of copper, graphite, molybdenum, and tungsten by inserting appropriate specimens in the flame. Results indicate that the technique of measurement requires further development to obtain reliable measurements using a plasma flame. (auth) « less" @default.
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- W241429581 date "1958-03-01" @default.
- W241429581 modified "2023-09-27" @default.
- W241429581 title "INVESTIGATION OF THE HIGH INTENSITY ARC TECHNIQUE FOR MATERIALS TESTING. Period Covered: April 1957 to March 1958" @default.
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