Publication:
The effects of nozzle geometry on particle size distribution in a small two dimensional rocket motor

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Authors
Brennan, William Dennis
Subjects
Particle sizing
Solid propellant rocket motors
Light scattering
Malvern
Advisors
Netzer, David Willis
Date of Issue
1989-09
Date
September 1989
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Laser diffraction particle sizing was conducted at the nozzle entrance, inside the nozzle, and in the exhaust plume of a small two-dimensional rocket motor using two different metallized propellants to determine the effects of nozzle geometry on particle breakup. Six different nozzles were used, including three converging nozzles and three converging/diverging nozzles. An AP-GAP/AI propellant containing 4.69 percent aluminum showed no significant effects of nozzle geometry on exhaust plume particle size. Exhaust plume measurements showed consistent results under various conditions, indicating that the particle breakup had been completed at the nozzle throat. The particle size distribution was successfully tracked through the motor for one particular converging section, with particle breakup inside the nozzle occurring prior to that predicted by theoretical analysis. An AP/HTPB/ZrC propellant containing 1/0 percent zirconium carbide exhibited particle size variation in the exhaust plume, but sparse data and varying combustion chamber pressures precluded isolation of the causal factor. Additionally, combustion chamber pressure was shown to decrease measured particle size inside the motor for both propellants. Extensive particle sizing validation experiments using particles of known size suspended in distilled water were conducted throughout the course of the investigation to assist interpretation of laser diffraction particle sizing data.
Type
Thesis
Description
Series/Report No
Department
Department of Aeronautics and Astronautics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
99 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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