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VIDEOS

Test 6: Dispersion and Burning Behavior of Hydrogen Released in a Full-Scale Residential Garage in the Presence and Absence of Conventional Automobiles (View of garage interior from floor camera)

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Dispersion and Burning Behavior of Hydrogen Released in a Full-Scale Residential Garage in the Presence and Absence of Conventional Automobiles

View of garage interior from floor camera

The experiments from which the videos were obtained were conducted at Southwest Research Institute (SwRI), San Antonio, Texas under contract to NIST. [1,2] The experimental series was part of the NIST Hydrogen Fire Safety program. The experiments were conducted using a specially constructed stand-alone garage with the garage door closed. Hydrogen was released through a distribution port located flush with the floor at the center of the garage. Several tests were run in which a conventional automobile (various makes and models) with an empty gasoline tank and all windows and doors closed were parked in the garage centered over the hydrogen release. The hydrogen release scenario assumed a constant leak rate sufficient to release 5 kg (a typical amount for full tanks on current hydrogen-fueled automobiles) in 1 h. When the hydrogen concentration reached a specified value at a specific location near the garage ceiling, ignition of the hydrogen/air mixture was initiated using an 80 J squib charge. The entire period during the burning process was recorded using digital hand-held still cameras with video capability, standard high-definition (HD) video cameras, an infrared (IR) video camera, and a high-speed camera operating at 1 kHz. At various times, cameras were placed inside the test garage (protected by a plastic housing) near the floor in the rear right corner (HD camera), at the side windows of the garage viewing the ignition area or the center region (HD and/or IR), and at outside positions located at various distances and angles from the garage (HD, high-speed, and digital hand-held cameras).

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October 2, 2017