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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.


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Proceedings Article
01 Jan 2000
TL;DR: In this article, a high-speed CCD video camera was used to capture aluminum combustion in a solid-rocket chamber flow field with variable chamber pressure and temperature, and the results showed that the aluminum flame burns with a much greater intensity at chamber pressures, indicating an increase in flame temperature and the flame/Al2O3 cloud region thickens and extends close to the droplet surface.
Abstract: The combustion of aluminum droplets was studied in a solid-rocket chamber flow-field with variable chamber pressure. Rocket motor chamber conditions were generated directly from an aluminized solid propellant combustion products flow field. The experimental test conditions were 1-20 atm pressure and ~2300 K temperature. Images of the burning aluminum droplets were made with a high-speed CCD video camera, and were de-convoluted with an Abel transformation to give radial intensity profiles of the flame and A12O3 smoke cloud surrounding each droplet. High-magnification experiments have shown major differences in the combustion of aluminum between well-studied 1 atm cold air environments and solid rocket motor conditions. The aluminum droplet flame burns with a much greater intensity at chamber pressures, indicating an increase in flame temperature, and the flame/Al2O3 cloud region thickens and extends close to the droplet surface, possibly indicating a reaction-limited mechanism in the H2O/CO2 environment. The mean value for the location of the peak intensity in the flame/Al2O3 cloud region is (r^/r,^) 2.5, and there was no apparent correlation between flame/Al2O3 smoke size and chamber pressure. However, as droplet diameter decreases, the overall A12O3 smoke cloud size increases, indicating a reaction-limited system becoming more fuel-lean as the droplet surface area decreases. Lastly, studies were conducted to observe combustion events at the surface of the aluminized propellant. Aluminum particles were first almost fully 'cleaned' before ignition began, but there was still enough binder to hold the aluminum particles onto the surface during ignition, which can lead to agglomeration.

10 citations

Patent
20 Apr 1999
TL;DR: Differential valve for a sub-sea flexible pipe having a valve body comprising an upper part communicating with the outside via an upper communication passage and a lower part connecting with at least one annulus of the flexible pipe via one communication duct, an internal chamber formed in the valve body and at a chamber pressure.
Abstract: Differential valve for a sub-sea flexible pipe having a valve body comprising an upper part communicating with the outside via at least one upper communication passage and a lower part communicating with at least one annulus of the flexible pipe via at least one communication duct, an internal chamber formed in the valve body and at a chamber pressure (Pc), a main clacker element mounted in the internal chamber and movable between a closed position and an open position, and urged toward the closed position by a first spring, a secondary clacker element mounted in the upper communication passage also movable between a closed position and an open position, the secondary clacker element being urged towards the closed position by a smaller preloaded spring, so that the pressure in the internal chamber is not below the exterior pressure (Pe) when the secondary clacker element is in the closed position.

10 citations

Journal ArticleDOI
TL;DR: In this article, an electron cyclotron resonance (ECR) plasma source 16 cm in diameter using a planar ring-cusp magnetic field and a reentrant coaxial cavity was developed.
Abstract: An electron cyclotron resonance (ECR) plasma source 16 cm in diameter using a planar ring‐cusp magnetic field and a reentrant coaxial cavity was developed. The planar ring‐cusp magnetic field produces a large‐area ECR surface. The reentrant coaxial cavity forces microwaves to be introduced into the ECR surface from an annular window of a discharge chamber sidewall. This plasma source generated large‐area, uniform, and stable plasmas. At 0.079 Pa of discharge chamber pressure for Ar, the plasma uniformity was 11.1% within a 12‐cm‐diam plane. Above 184 W of forward power, overdense plasmas were produced on the center axis at 0.079 Pa. The maximum Ar plasma density of 1.14×1011 cm−3 was achieved on the center axis at a discharge chamber pressure of 0.079 Pa with a forward power of 437 W.

10 citations

01 Jan 2012
TL;DR: In this article, a 15 ps pulsed Leopard D-10 laser is used along with an optical Kerr cell to realize ballistic images of high-delivery-pressure (>100 MPa) dodecane sprays injected via a single 160 micron hole injector into a quiescent air environment at elevated temperature and pressure.
Abstract: Diesel engines are an important aspect of our transportation infrastructure, whose performance is greatly affected by the characteristics of the spray from their injectors. Characterization of the injector’s sprays is therefore key to clean-running efficient diesel motors. In this study, a ~15 ps pulsed Leopard D-10 laser is used along with an optical Kerr Cell to realize ballistic images of high-delivery-pressure (>100 MPa) dodecane sprays injected via a single 160 micron hole injector into a quiescent air environment at elevated temperature and pressure. Using CS 2 as the Kerr switching media and by optimizing the overlap of the gate and imaging beams, an effective high speed shuttering effect is obtained. This effort resulted in the first usage of a ballistic imaging technique to successfully capture the spray behavior of dodecane injected into an air environment with temperatures to 600oC and pressures to 20 atm, typical of pre-combustion conditions of diesel engines. Control of the imaging beam arrival time after the start of injection allowed for the capture of images from separate injections that detail the spray's development over time. The resulting images demonstrate significant differences in spray behavior over a range of chamber temperatures and pressures. Specifically, at low pressure and temperature, some smooth wave structure is apparent, but at high chamber pressure, sprays show significant signs of violent mass shedding from the spray periphery.

10 citations


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