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| Rocket Motor Nozzle Closure |
This page provides the Rocket Motor Simulation Module user with a visual definition of Nozzle Closure.
The nozzle typically has some sort of closure meant to prevent contamination of the interior surface of the grain and provide containment of the ignition and booster charge until the interior surface of the main energetic propellant grain is burning. For the tutorial example, this is shown in the figure below:
The nozzle closure is a thin membrane fabricated from metal, plastic or other material or combination of materials that typically runs on the order of 0.05mm to 0.10mm thick, depending on the application. The closure disintegrates once sufficient pressure is developed in the rocket motor combustion chamber. The closure material is either consumed in the motor exhaust or is ejected from the rocket motor.
The user will be prompted on the next page for the Nozzle Closure Blow-out Pressure which represents the pressure difference across the closure required for membrane rupture.
| © 2006 Arrow Tech Associates |