Results 261 to 270 of about 42,983 (307)
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Modeling the influence of anode–cathode spacing in a pulsed discharge nozzle
Spectrochimica Acta Part B: Atomic Spectroscopy, 2005Abstract The pulsed discharge nozzle (PDN) is a spectrochemical source that is designed to produce and cool molecular ions in an astrophysically relevant environment in the laboratory with limited fragmentation. In order to gain a better understanding of the PDN and to optimize the yield of molecular ions and radicals in the PDN source, a parameter ...
Broks, B.H.P. +6 more
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Performance of an aero-space plane propulsion nozzle
20th Fluid Dynamics, Plasma Dynamics and Lasers Conference, 1989An inviscid and viscous analysis is provided for an exposed half nozzle that is used with a scramjet for thrust generation. The analysis is based on the inviscid theory of a two-dimensional, minimum length nozzle with a curved inlet surface, where the flow may be sonic or supersonic. Inlet conditions are prescribed and the gas is assumed to be perfect.
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Effect of Nozzle Spacing on NOx Emissions and Lean Operability
54th AIAA Aerospace Sciences Meeting, 2016NOX emissions and the equivalence ratio resulting in lean extinction of two adjacent gas turbine fuel/air nozzles are measured as the spacing between the two nozzles is varied. Two swirl-stabilized nozzle types are tested: a high-stability pilot design and low-emission design with much lower swirl number. Jet A is used as the fuel.
Brian J. Dolan +3 more
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Flow characteristics of the diffuser/nozzle micropump—A state space approach
Flow Measurement and Instrumentation, 2012Abstract This paper presents a new approach to predict the internal state of piezo driven (consisting of diaphragm and piezoelectric disc) diffuser/nozzle micropump at any instant of time. The dynamic performance is evaluated considering the damping effect.
S. Chandika +2 more
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Investigation of a spray cooling system with two nozzles for space application
Applied Thermal Engineering, 2015Abstract This paper presents a novel spray cooling system applicable to space thermal management systems. Using porous foamed copper, this cooling system is integrated with phase-change microfluidic cooling tactics, able to realize liquid loop control and vapor–liquid separation (VLS) in microgravity due to capillary forces and superhydrophilicity ...
Ji-Xiang Wang +6 more
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Effect of Nozzle Spacing on Nitrogen-Oxide Emissions and Lean Operability
AIAA Journal, 2016Nitrous-oxide emissions and the equivalence ratio resulting in lean extinction of two adjacent gas turbine fuel/air nozzles are measured as the spacing between the two nozzles is varied. Two swirl-stabilized nozzle types are tested: a high-stability pilot design, and a low-emission design with a much lower swirl number. Jet A is used as the fuel.
Brian Dolan +4 more
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Parameterization of magnetic nozzle flow physics for an in-space propulsion application
42nd AIAA Plasmadynamics and Lasers Conference, 2011The e ciency of a magnetic nozzle in converting thermal energy into directed axial energy is dependent on several factors, most notably on how and where the plasma separates or \detaches" from the nozzle. A detailed knowledge of the physics of this detachment process is presently lacking, but is necessary in order to optimize magnetic nozzle design for
Daniel Araya +3 more
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A CFD Investigation on the Nozzle of Orifices Distributing in Different Space Layers
SAE Technical Paper Series, 2008<div class="htmlview paragraph">A series calculation methodology from the injector nozzle internal flow to the fuel spray was applied to investigate the internal flow and spray of a nozzle whose orifices distributed in different space layers.
Huiyong Du, Jianxin Liu, Jinping Tang
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Applied Acoustics, 2014
Abstract Acoustic emissions were characterized for fourteen, 8 × 8 arrays of axisymmetric supersonic jets experimentally. The nozzle diameters ranged from 3.2 mm (1/8 in.) to 6.4 mm (1/4 in.) and the hole-to-hole spacing ( S ) over hole diameter ( d ), or the S / d ratios ranged from 1.44 to 3.
Ian S. Coltrin +3 more
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Abstract Acoustic emissions were characterized for fourteen, 8 × 8 arrays of axisymmetric supersonic jets experimentally. The nozzle diameters ranged from 3.2 mm (1/8 in.) to 6.4 mm (1/4 in.) and the hole-to-hole spacing ( S ) over hole diameter ( d ), or the S / d ratios ranged from 1.44 to 3.
Ian S. Coltrin +3 more
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Space Shuttle main engine nozzle-steerhorn dynamics
22nd Structures, Structural Dynamics and Materials Conference, 1981On two occasions during the Space Shuttle main engine development, the LH2 feedline (called the steerhorn, because of its shape) failed during the cutoff transient. A dynamic test was undertaken, and an analytical model was developed and correlated to the dynamic test.
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