Propellant Actuated Device for Parachute Deployment during Seat Ejection for an Aircraft Application
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Propellant Actuated Devices (PAD) are installed on various combat aircraft of the Air Force and Naval bases to perform extremely important operations such as parachute deployment, harness and leg restraint, cable cutting, pullers, seat ejection, bomb release, fuel tanks, etc. They are basically called "gas generators." Such devices produce high-temperature and high-pressure combustion gases on initiation and are used to perform different operations. These cartridges are single-shot operating devices. The performance of such types of PADs cannot be tested by non-destructive techniques. Hence, cartridges are designed to function with high reliability and stringent quality control checks at all levels during the entire development cycle. The safety features required during handling, storage, and transportation are built into the design of the PAD. The cartridges are required to undergo different and exhaustive design qualification tests to qualify design aspects. A total life of six years is assigned to the cartridge after a performance degradation study of the propellant, which includes two years of installed life. This paper explains the development aspects of PAD, its use, function, testing, and performance evaluation methodology in a suitable fabricated velocity test rig (VTR). The maximum slug velocity is 121.14 m/s in the hot condition, and the minimum slug velocity is 99.14 m/s in the cold condition. The main objective of this paper is to devise a novel method to measure the actual slug velocity of the aircraft gun inside a cartridge using VTR and Doppler RADAR.
Doi: 10.28991/HIJ-2020-01-03-03
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