Topic
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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TL;DR: In this article, the effect of shape parameters and chamber pressure on the free surface elevation of a land-based oscillating water column (OWC) in regular incident waves was analyzed.
Abstract: The aim of this experimental study was to analyze the effect of the shape parameters and chamber pressure of a land-based oscillating water column (OWC) in regular incident waves. The magnitude of the free surface elevations inside the chamber was measured in a two-dimensional wave tank for various chamber skirt drafts and bottom slope angles. The surface elevations were also measured under both open chamber and partially open chamber conditions. From these measurements, the optimum shape of the OWC device could be predicted for the maximum wave energy conversion efficiency. It was found that the resonance frequency of the OWC system associated with incident waves moved toward the long wave region with increments of the draft of the chamber skirt and bottom slope. The behavior of the free surface elevation inside the chamber was also found to be dependent on the chamber pressure.
9 citations
TL;DR: In this article, an oil mist generation system was developed for introducing a fine mist into the chamber and results were presented for varying mist flowrates. But it seems highly likely that the properties of fluid under the shroud differ from those of the fluid in the external chamber.
Abstract: In many aeroengines the accessory power offtake is achieved using a spiral bevel gear set running off one of the main shafts. The crown and bevel gears are housed in an internal gearbox and there is significant heat generation within this chamber, some of which is attributed to windage power loss (WPL) generated by the gear. Over the past few years the University of Nottingham Technology Centre (UTC) in Gas Turbine Transmissions has been researching spiral bevel gear windage power loss both computationally and experimentally using a purpose-built test rig at the UTC. In this study the test rig has been adapted such that chamber pressures up to 8 bar can be generated. Test data has been obtained that shows the effect on WPL of chamber pressure, advancing understanding of the relationship between data obtained at ambient and pressurised conditions. Three configurations have been studied: unshrouded gear, gear with 360° shroud and shrouded, crown and pinion meshing pair. Further, the effect of oil mist within the chamber on WPL has been studied. An oil mist generation system was developed for introducing a fine mist into the chamber and results are presented for varying mist flowrates. A mist measurement system was developed to sample mist mass fraction within the chamber and the data obtained is used to calculate an effective (oil/gas mixture) chamber density. Increasing chamber pressure increases Reynolds number, moving the system behavior further along the Moment coefficient-Reynolds number correlation. The Cm -Re correlation is similar in form to that for a shrouded cone, showing transitional behavior around Re = 2×106 . Beyond transition Cm decreases with increasing Re. Introducing an oil spray has two effects: reduction in chamber temperature and increase in effective density of chamber fluid. Both effects can be accounted for by calculating Re and Cm based on mixture properties but it seems highly likely that the properties of the fluid under the shroud differ from those of the fluid in the external chamber.© 2011 ASME
9 citations
Patent•
22 Jan 1991TL;DR: In this paper, an improved freight brake emergency valve device has been proposed, having improved stability against undesired emergency brake applications, without loss of emergency sensitivity, using a flow regulator in the form of a valve and choke combination or a choke itself.
Abstract: An improved freight brake emergency valve device having improved stability against undesired emergency brake applications, without loss of emergency sensitivity. Flow regulator in the form of a valve and choke combination or a choke itself is employed between the quick action chamber and the chamber normally subject to quick action chamber pressure on the side of the emergency piston opposite brake pipe pressure. This has the effect of momentarily reducing the volume of quick action chamber pressure in order to achieve an intensified pressure reduction in response to initial deflection of the piston member sufficient to counteract a momentary, spurious brake pipe pressure fluctuation.
9 citations
Patent•
31 Aug 2006
TL;DR: In this article, the authors proposed a cell-culturing facility capable of maintaining a high cleanliness in a cell preparing chamber and also realizing the physical containment of air in the cell-preparing chamber.
Abstract: PROBLEM TO BE SOLVED: To provide a cell-culturing facility capable of maintaining a high cleanliness in a cell-preparing chamber and also realizing the physical containment of air in the cell-preparing chamber. SOLUTION: This cell-culturing facility 1 comprises the cell-preparing chamber 6 for performing works associated with the cell preparation, an airlock frontal chamber 5 of the cell preparation chamber 6, and an airlock rear chamber 7, wherein the cell preparation chamber 6 is kept at an atmospheric pressure, the airlock frontal chamber 5 is kept at a higher chamber pressure than that of the cell preparation chamber 6, and the airlock rear chamber 7 is kept at a lower chamber pressure than that of the cell preparation chamber 6. COPYRIGHT: (C)2006,JPO&NCIPI
9 citations
TL;DR: In this paper, the performance of prepared propellant grade hydrazine shows it as a promising rocket fuels and the desired combustion was smooth and C* achieved was higher than that of UH-25, N2O4 combination.
Abstract: Propellant grade hydrazine was prepared with 64 per cent yield and 95.5 per cent purity. Purity of the propellant grade hydrazine was determined using wet chemical, gas chromatographic (GC) and eudiometric methods. It was observed that the compositions containing blends of hydrazine-methyl alcohol-ammonium nitrate and hydrazine-methyl alcohol-ammonium perchlorate were not found to be frozen even after cooling to -65 °C for 30 minutes. Mono and bi-propellant thrusters were designed and developed to demonstrate the performance of prepared propellant grade hydrazine as a promising rocket fuel. Five static tests with 22 N thruster and one static test with 1 N thruster were performed successfully in mono-propellant mode. The hurdles of chamber pressure oscillations were overcome by compact packing of the catalyst. The desired decomposition and chamber pressure were achieved. One static test was performed successfully with 60 N bi-propellant thruster. The desired chamber pressure and thrust were achieved. The combustion was smooth and C* achieved was higher than that of UH-25, N2O4 combination. The performance of prepared propellant grade hydrazine shows it as a promising rocket fuels.Defence Science Journal, Vol. 65, No. 1, January 2015, pp.31-38, DOI:http://dx.doi.org/10.14429/dsj.65.7986
9 citations