Topic
Ullage
About: Ullage is a research topic. Over the lifetime, 501 publications have been published within this topic receiving 4704 citations. The topic is also known as: headspace.
Papers published on a yearly basis
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01 Jun 1993TL;DR: In this paper, a flight-weight 4.89 cu m liquid hydrogen storage tank under normal gravity conditions was used to study the effects of longer transfer times expected in future space flight applications and found that the increase in pressurant consumption with increased operational time is significant at shorter pressurization or expulsion durations and diminishes as the duration lengthen.
Abstract: Experimental results are presented for pressurization and expulsion of a flight-weight 4.89 cu m liquid hydrogen storage tank under normal gravity conditions. Pressurization and expulsion times are parametrically varied to study the effects of longer transfer times expected in future space flight applications. It is found that the increase in pressurant consumption with increased operational time is significant at shorter pressurization or expulsion durations and diminishes as the duration lengthens. Gas-to-wall heat transfer in the ullage is the dominant mode of energy exchange, with more than 50 percent of the pressurant energy being lost to tank wall heating in expulsions and the long duration pressurizations. Advanced data analysis will require a multidimensional approach combined with improved measurement capabilities of liquid-vapor interfacial transport phenomena.
10 citations
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TL;DR: In this article, a non-linear diffusion model with forced convection in the form of a reactionabsorption system was provided to produce inerted ullage in an Airbus A320 aircraft center fuel tank.
Abstract: The aim of this work was to provide a formulation of a non-linear diffusion model with forced convection in the form of a reaction–absorption system. The model was studied with analytical and numerical approaches in the frame of the parabolic operators theory. In addition, the solutions are applied to a gas interaction phenomenon with the intention of producing an inerted ullage in an Airbus A320 aircraft centre fuel tank. We made use of the travelling wave (TW) solutions approach to study the existence of solutions, stability and the precise evolution of profiles. The application exercise sought to answer a key question for aerospace sciences which can be formulated as the time required to ensure an aircraft fuel tank is safe (inerted) to prevent explosion due to the presence of oxygen in the tank ullage.
9 citations
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28 Oct 1971TL;DR: In this article, a valve has a conical passageway which is obturated by conical spool, and the spool is preloaded closed by spring means, and is operated by the hydraulic presence of the liquid flowing through the passage.
Abstract: A valve has a conical passageway which is obturated by a conical spool. The spool is preloaded closed by spring means, and is operated by the hydraulic presence of the liquid flowing through the passageway.
9 citations
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12 Dec 1984TL;DR: A vehicle fuel tank vent system has a vent tube (22) extending below the ullage space (20) with a U-shaped portion (30) arranged to maintain a head of fuel which prevents "trickle filling" as mentioned in this paper.
Abstract: A vehicle fuel tank vent system has a vent tube (22) extending below the ullage space (20) with a U-shaped portion (30) arranged to maintain a head of fuel which prevents "trickle filling". A vent hole (28) in the vent tube above the maximum fuel level provides for exit of air/vapour from the tank (10) if the fuel expands before clearing the lower end of the vent tube. The vent tube (22) includes a reservoir (24) at or above the level of the filler cap (16) for collecting any fuel in the U-shaped portion (30) and allowing air/vapour to be vented to atmosphere without spillage.
9 citations
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13 May 1977TL;DR: In this paper, a liquid supply line terminates at a location within the upper half of a vessel and discharges into a vertical draft-tube which is in fluid communication with the ullage portion of the vessel.
Abstract: A liquefied gas tank having thermal insulation in association with a fluidtight body. A liquid supply line terminates at a location within the upper half of said vessel and discharges into a vertical draft-tube which is in fluid communication with the ullage portion of the vessel. The liquefied gas which is supplied into the draft-tube is conditioned to the pressure and temperature within the vessel as it travels downward to the bottom before it can flow radially outward into the tank.
9 citations