Cold start surge current limiting system for a hydrazine thruster augmentation heater

An electrothermal hydrazine thruster passes the hydrazine through a catalyst bed and an augmentation heater. The augmentation heater includes an electrical heating element powered by a satellite battery. A load resistance is coupled in series with the heating element to reduce the current through th...

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Bibliographic Details
Main Author BINGLEY; JOHN D
Format Patent
LanguageEnglish
Published 18.06.1985
Edition3
Subjects
BLASTING
CONTROLLING
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
HEATING
LIGHTING
MACHINES OR ENGINES FOR LIQUIDS
MECHANICAL ENGINEERING
OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
PHYSICS
PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDEDFOR
PRODUCING MECHANICAL POWER
REGULATING
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
WEAPONS
WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
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Summary:An electrothermal hydrazine thruster passes the hydrazine through a catalyst bed and an augmentation heater. The augmentation heater includes an electrical heating element powered by a satellite battery. A load resistance is coupled in series with the heating element to reduce the current through the electrical circuit including the heating element to a safe level. A switch coupled across the load resistance is closed bypassing the load resistance when the heating element heats up and increases its resistance value to a value that can be tolerated in the battery circuit.
Bibliography:Application Number: US19830481384