scispace - formally typeset
Search or ask a question
Topic

Chamber pressure

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


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the effects of geometry and position of the metal delivery tube in an ultrasonic gas atomization (USGA) device on the pressure condition in the gas-metal interaction zone at the tube orifice have been studied.
Abstract: The effects of geometry (diameter and tip design) and position (relative to the gas nozzles) of the metal delivery tube in an ultrasonic gas atomization (USGA) device on the pressure condition in the gas-metal interaction zone at the tube orifice have been studied. Simulation of ultrasonic gas (argon or nitrogen) atomization has been conducted, both at low (3.5 to 14 atm) and high (15 to 75 atm) atomization pressures. Low gas atomization pressures are generally used in spray deposition processes such as liquid dynamic compaction (LDC), while high pressures are used for powder production. Depending on the experimental conditions, i.e. the shape and angle of the taper at the metal delivery tube orifice or its position with respect to the nozzles' gas exit common plane, either partial vacuum (equivalent to downward aspiration of the melt) or overpressures (equivalent to back-pressurization of the melt) at the metal delivery tube was detected. Underpressure and overpressure effects were found to increase with gas atomization pressure. The maximum pressure differences measured with respect to the atomization chamber pressure were about 0.15 to 0.25 atm for the low-pressure experiments, and 0.50 to 0.60 atm for the high-pressure experiments. Underpressures or overpressures of these magnitudes have a large effect on the metal flow rate during gas atomization, either enhancing or reducing it, and thus changing significantly the gas to metal flow ratio. Because this is a crucial parameter for both the USGA and the LDC processes, the state of pressure at the delivery tube's orifice has to be monitored carefully, in order to ensure optimal processing conditions.

18 citations

Patent
22 Jan 1971
TL;DR: In this article, a fuel ignition system and a flow switch are described, and a permanent magnet is connected to the diaphragm to actuate the switch when there is a very small inlet-to-outlet flow of fuel.
Abstract: A fuel ignition system and a flow switch therefor which can be used for leak detection and otherwise. Upon detection of the flow, ignitor elements in the system are heated to cause combustion of the fuel at the point of release of the fuel in the system. The flow switch includes a diaphragm which separates a pressure chamber from the outlet side of the system. The inlet side is connected to the pressure chamber to cause the chamber pressure to be the same as that on the inlet side. A permanent magnet is connected to the diaphragm and is responsive to a pressure differential between the inlet side and the outlet side to actuate the switch when there is a very small inlet-to-outlet flow of fuel. Also connected to the diaphragm is a stem for actuating the main valve connecting the inlet side of the system to the outlet. The main valve permits fuel to flow through the switch with a very small pressure drop across the switch. The stem and main valve have a lost motion connection therebetween to insure positive closing of the valve and positive engagement of the permanent magnet with the switch casing.

18 citations

Patent
23 Jan 1990
TL;DR: In this article, a variable capacity wobble plate compressor includes a control valve (45) for controlling the chamber pressure in the crank chamber to adjust the angle of the wobble plates; a pressure sensor (53); a rotary speed sensor (56); a heat load sensor (61); and/or a vibration sensor (62).
Abstract: A variable capacity wobble plate compressor includes a wobble plate (36) in the crank chamber (7) for adjusting the piston stroke; a control valve (45) for controlling the chamber pressure in the crank chamber to adjust the angle of the wobble plate; a pressure sensor (53); a rotary speed sensor (56); a heat load sensor (61); and/or a vibration sensor (62); and a control unit responsive to a signal from at least one of the sensors for controlling the control valve to prevent the compressor from entering an unstable zone.

18 citations

Journal ArticleDOI
TL;DR: In this paper, a laser velocimeter was used to measure spray particle velocities in a low pressure plasma spray system at chamber pressures ranging from 6.7 to 80 kPa (50 to 600 Torr).
Abstract: A laser velocimeter has been used to measure spray particle velocities in a low pressure plasma spray system at chamber pressures ranging from 6.7 to 80 kPa (50 to 600 Torr). For Al2O3 spray powder with a mean diameter of 44 μm, peak particle velocities were of the order of 200 – 400 m s-1. The measured velocity distributions were strongly dependent upon spray chamber pressure, with the highest particle velocities at intermediate pressures of about 40 kPa (300 Torr). Particle velocities predicted with a simple analytical model are in reasonable agreement with experimental results close to the spray gun, where drag due to chamber gases can be neglected. This simple model also correctly predicts a particle velocity maximum at 45 kPa (340 Torr).

18 citations

Proceedings ArticleDOI
01 Jan 1978
TL;DR: In this paper, cylindrical rocket thrust chamber cylinders were coated with a 0.203 mm (0.008 in) layer of zirconium oxide using a process that employed electrodeposition of metal to a spray coated mandrel.
Abstract: Cylindrical rocket thrust chamber cylinders were coated with a 0.203 mm (0.008 in.) layer of zirconium oxide using a process that employed electrodeposition of metal to a spray coated mandrel. The cylinders were cyclically tested using hydrogen oxygen propellants at a nominal chamber pressure of 4.14 MN/sq m (600 psia) to show the effect of the coating on life. Both cylinders failed prematurely due to causes unrelated to the coatings. Post destructive analysis showed no cooling passage wall deformation. Where erosion of the coating occurred, the coating thickness stabilized at 0.061 mm (0.0024 in.) within 80 cycles and remained well adhered throughout the tests.

18 citations


Network Information
Related Topics (5)
Coating
379.8K papers, 3.1M citations
71% related
Combustion
172.3K papers, 1.9M citations
69% related
Particle size
69.8K papers, 1.7M citations
69% related
Voltage
296.3K papers, 1.7M citations
69% related
Reynolds number
68.4K papers, 1.6M citations
68% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202322
202257
202167
202086
201991
201882