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Chamber pressure

About: Chamber pressure is a research topic. Over the lifetime, 2988 publications have been published within this topic receiving 30725 citations.


Papers
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Proceedings ArticleDOI
Hai-Tien Loh1, Mehdi Golafshani1
18 Jun 1990
TL;DR: In this paper, a time-dependent, two-dimensional, axisymmetric numerical solution technique was developed to model viscous chemically reactive flow in hybrid solidiiquid rocket motors.
Abstract: A time-dependent, two-dimensional, axisymmetric numerical solution technique has been developed to model viscous chemically reactive flow in hybrid solidiiquid rocket motors. The solution empfoys an implicit finite-volume, lower-upper symmetric successive overrelaxation scheme (LU-SSOR) based on fluxdifference splitting of a Roe-type approximate Riemann solver. The combustion process is modeled by a twospecies one-step finite-rate reaction model whereas turbulence is simulated by the Baldwin-Lomax algebraic eddy viscosity turbulence model. The solution provides predictions of flow structure and combustion within. the solid grain pod and throughout the nozzle for any oxidizer flow rate. In addition, motor operating chamber pressure and grain regression rate are also computed. Numerical simulation of a labscale motor firing is presented, and comparison with the experimental data shows good agreement between predicted and measured chamber pressure and regression rate. ,

18 citations

Patent
28 Aug 1992
TL;DR: In this paper, a rolling diaphragm (18) has a face exposed to the fluid in the chamber (24), and actuates the valve (30) to connect the chamber to the source when the chamber pressure drops below the predetermined value and to disconnect the chamber from the source by pushing against it with a force corresponding to the predetermined pressure value.
Abstract: A chamber (24) is filled with a fluid whose pressure is to be regulated to a predetermined value. A valve (30) is disposed between the chamber (24) and a high pressure source of the fluid. A rolling diaphragm (18) has a face (18c) exposed to the fluid in the chamber (24), and actuates the valve (30) to connect the chamber (24) to the source when the chamber pressure drops below the predetermined value and to disconnect the chamber (24) from the source when the chamber pressure rises to substantially the predetermined value. A spring (26) urges the diaphragm (18) against the chamber pressure with a force corresponding to the predetermined pressure value. A piston (14) is connected between the spring (26) and the diaphragm (18) and is formed with a ramp portion (14b) over which a rolling portion (18b) of the diaphragm (18) extends and varies the effective diameter of the diaphragm (18) as a predetermined function of the longitudinal position of the diaphragm such that the force exerted on the diaphragm (18) by the chamber pressure is maintained substantially equal to the force exerted on the diaphragm (18) by the spring (26). This compensates for variation of the spring force as the fluid flow rate through the valve (30) and thereby the position of the diaphragm (18) change and maintains the regulated pressure constant. A bistable element (42) may be provided to urge the diaphragm (18) toward first and second longitudinal positions in which the valve (30) is open and closed respectively.

18 citations

Patent
15 Sep 1993
TL;DR: In this article, an accumulating chamber has its fluid pressure regulated between the pressure of a given source pressure value and a discharge pressure value by a regulator having a transfer volume and first, second, and third solenoid valves.
Abstract: An accumulating chamber has its fluid pressure regulated between the pressure of a given source pressure value and a discharge pressure value. Electronic control of the accumulating chamber pressure is accomplished by a regulator having a transfer volume and first, second, and third solenoid valves. The transfer volume is connected to the accumulating chamber by the first solenoid valve. The second solenoid valve connects the transfer volume to a pressure source at the given source pressure value. A third solenoid valve connects the transfer volume to open air. A pressure sensor measures the pressure in the accumulating chamber and is connected to an electronic control system.

18 citations

Patent
13 Nov 1990
TL;DR: In this paper, a method for removing contaminant particles from a surface of an article was proposed, where bubbles spontaneously formed in the liquid, and the contaminants were dislodged from the surface of the article and carried toward the surface by the bubbles.
Abstract: This invention provides methods and apparatus for removing contaminant particles from a surface of an article (113). In one embodiment, a surface of an article (120) to be cleaned is immersed in cleaning liquid (117) in a pressure vessel chamber (115) and a dissolving gas (119) is dissolved into the cleaning liquid (117) at high pressure. A pressure relief valve (123) is then suddenly opened, bubbles spontaneously form in the liquid, and the contaminants are dislodged from the surface of the article (113) and carried toward the surface of the liquid (117) by the bubbles. A small amount of the cleaning liquid containing the dissolved gas can further be caused to form a thin frozen layer (120) on the surface of a submerged article to be cleaned, before the chamber pressure is then dropped suddenly, causing a spontaneous bubble formation in the frozen layer that moves the contaminant particles away from the surface to be cleaned. The contaminants and cleaning liquid or the frozen layer are then removed from the surface.

18 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202322
202257
202167
202086
201991
201882