Modeling of an explosively driven micro-valve

Document Type

Conference Proceeding

Publication Date

1-1-2007

Abstract

An analysis Is given which demonstrates how the performance of a well-characterized explosively actuated valve configuration (length L ∼ 2.5 cm) varies with a linear reduction in size. The analysis is based on a time-dependent, system-level model that tracks the evolution of explosive and product mass and energy within the actuator due to combustion, product gas flow from the actuator to an expansion chamber due to a pressure imbalance, work performed by gas within the expansion chamber in pushing a deformable piston into a constant area bore during stroke, and heat transfer with the surroundings. Predictions indicate that the baseline valve is significantly overdriven by the 150 mg of HMX (C4H8N8O 8) contained in the actuator; consequently, little variation in performance is predicted for a reduction in valve size over the range 0.44 ≤ s < 1, where a = l/L is a scale factor. Performance variations are predicted for approximately s < 0.44 due to unrestricted compressible gas flow through the actuator port that reduces the pressurization rate within both the actuator and expansion chamber, and results in irregular piston motion. The analysis demonstrates how product gas flow between internal valve components may adversely affect the performance of small valves. Copyright © 2007 by the American Institute of Aeronautics and Astronautics, Inc.

Publication Source (Journal or Book title)

Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting

First Page

3570

Last Page

3581

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