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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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Journal ArticleDOI
TL;DR: In this article, a discrete element method simulation was used to evaluate tunneling-induced ground movement and the parameters of tunnel boring machines, including soil excavation with a cutter head, soil conditioning in the chamber, and removal of the excavated soil with a screw conveyor.

42 citations

Journal ArticleDOI
TL;DR: In this paper, the effectiveness of an almost tagentially injected film of hydrogen with an initial temperature of approximately 280 K has been determined in a subscale rocket combustion chamber with a Vulcain2-like test case with combustion pressure levels up to 12 MPa.
Abstract: Experimental investigations have been carried out to examine film cooling effectiveness of an accelerated hot gas in a subscale rocket combustion chamber. In support of future first-stage high-performance rocket combustion chambers, a Vulcain2-like test case has been examined with combustion pressure levels up to 12 MPa. The effectiveness of an almost tagentially injected film of hydrogen with an initial temperature of approximately 280 K has been determined. Axial distributions of temperature were measured inside the copper liner as well as on the chamber surface in the convergent and divergent parts of the nozzle segment. An existing film cooling model has been modified for application in a combined convective and filmcooled combustion chamber with an accelerated hot gas. The new model predicts film cooling effectiveness at different combustion-chamber pressures and film blowing rates at sub-, trans-, and supersonic conditions.

42 citations

Proceedings ArticleDOI
09 Jul 2006
TL;DR: In this paper, a 25,000 pound-force thrust class expander cycle liquid oxygen/methane engine for Crew Exploration Vehicle applications was modeled, including combustion thermal chemistry, the turbopump assembly, the regenerative cooling jacket and the injector.
Abstract: A fully integrated engine analysis methodology was created and employed to study a 25,000 pound-force thrust class expander cycle liquid oxygen/methane engine for Crew Exploration Vehicle applications. All major components for the engine were modeled, including the combustion thermal chemistry, the turbopump assembly, the regenerative cooling jacket and the injector. Significant attention was assigned to the regenerative cooling analysis with respect to varying channel geometry dimensions. Chamber pressures ranging from 500 to 1000 psia, were parametrically studied for varying aspect ratios of 4 to 8, channel widths of 0.020 to 0.080 inches, and 100 to 200 number of channels. Two of the three geometric parameters were held fixed, while trends in the third were studied at constant chamber pressures. The channel cross-section was held constant with respect to axial position in the engine. From the geometry cases studied, the initial baseline channel geometry was determined and chamber pressures were studied in detail from 500 to 1000 psia. A chamber pressure of 850 was determined as most favorable with respect to overall engine performance and design metrics. Using the initial baseline geometry, a constant cross-section and stepped channel design were compared. The performance for the stepped channel configuration is notably superior to the constant cross-section channel case with respect to pressure loss, and chamber mass metrics. Detailed results are presented for all engine components for the most favorable design.

42 citations

Journal ArticleDOI
TL;DR: In this article, a prototype of a closed loop system was built to study multi-nozzle array spray cooling on high-power, large-area electronic devices, and the results indicated a promising prospect of using a multinode array on large area power electronics cooling, but the results also showed that spray-to-spray interactions had inconspicuous effects on local surface temperatures but rather the distance from a location relative to the drainage outlets.

42 citations

Journal ArticleDOI
TL;DR: In this article, the etch of anisotropic blind vias in silicon with diameters of 5-10μm and an aspect ratio ∼2-4 with controlled sidewall inclination is reported.
Abstract: The etching of anisotropic blind vias in silicon with diameters of 5–10μm and an aspect ratio ∼2–4 with controlled sidewall inclination is reported. The motivation for this work is the creation of a vertical, or three dimensional interconnect. Via formation by reactive ion etch (RIE) processing is the focus of this project. Arrays of vias have been etched in 125 mm diam silicon (100) wafers using a photoresist mask. A parallel plate RIE system with a SF6∕O2 gas mixture is used. The effects of O2∕(SF6+O2) gas flow ratio, electrode bias, and chamber pressure on etch rate and feature profile have been studied. Visualization of the via profiles using scanning electron microscopy is used to identify the key parameters that control the sidewall slope. This slope is important for the subsequent deposition of via lining materials before filling with Cu. Our results indicate that the O2∕(SF6+O2) ratio is a key parameter in determining the sidewall slope, however the electrode bias and chamber pressure are critical...

42 citations


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