ESTIMATING THE DIAMETER OF THE PLASMA IN A PROPULSION MOTOR PLUME.

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Abstract:

The diameter of a plasma intersecting the beam of a microwave diagnostic probe must be known to calculate the electron density in the plasma. The ambition to determine the diameter of a small scale model rocket plume by a simple, reliable analysis of the experimental conditions and data obtained by the probe was not completely realized. But some concepts and numbers were developed that have advanced the art of the analysis of the data. The results of an experimental determination of the energy distribution in the microwave beam has been used to calculate the attenuation of this energy by the plasma in an intersecting flame with given attenuation characteristics. The wavelengths of the two microwave beams used were 1.25 cm or 3.0 cm. A method was developed to calculate the attenuation, and a correction factor has been identified to be applied to the apparent attenuation to account for the relative size of the plume when the ratio of the beam diameter to the plume diameter is known. Author

Author(s):
Weston, J. P.
Author Organization(s):
NAVAL RESEARCH LAB WASHINGTON D C
Descriptive Note:
Interim rept.,
Pagination:
0029

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NRL-6872
Project Number(s):
NRL-R07-07, RF-17-344-401-4503
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application
Communities of Interest:
Weapons Technologies
Descriptor(s):
*ROCKET ENGINES, *EXHAUST FLAMES, PLASMAS(PHYSICS), MICROWAVES, ELECTRON DENSITY, PROBES
Field(s)/Group(s):
Combustion and Ignition, Rocket Engines
Keyword(s):
PLUMES(RADIATION), *ROCKET EXHAUST
Report Date:
1969 May 22