Results 201 to 210 of about 2,895 (256)
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The piston ring or the piston seal?
Russian Engineering Research, 2010Improvement in the efficiency of piston compression rings is considered. By taking account of the gas dynamics in determining piston-ring geometry and developing a system of piston rings and piston seals for various internal combustion engines, their basic performance and environmental characteristics may be improved.
Yu. F. Gortyshov +4 more
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Piston Velocities and Piston Work
Aircraft Engineering and Aerospace Technology, 1950WHEN evaluating engine efficiencies, mean effective pressures or the work done by the piston in internal combustion engines or compressors, it is generally assumed that the state of the working fluid is uniform throughout its mass. From this it follows that the expression for work where P denotes pressure and V, volume, holds.
J.S. Glass, J. Kestin
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Piston Vibration in Piston-Cylinder Systems
Journal of Fluids Engineering, 1980The motion of a cylindrical piston falling in a liquid filled vertical cylinder is analyzed. It is found that concentric motion is impossible and that flow induced vibration is always associated with such piston-cylinder systems. If the clearance over radius ratio is larger than a certain critical value, βcr, severe wobble and piston-cylinder contact ...
I. Etsion, M. Magen
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Simulation of the Piston and Piston Ring Dynamic
SAE Technical Paper Series, 2001<div class="htmlview paragraph">All reciprocating engines from the first Diesel engine to turbocharged formula 1 engines require a sealing of the combustion chamber. This sealing is realized by the compression rings. Today a set of two compression rings and one oil control ring is standard, the large variety of available solution demonstrate the ...
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On the piston problem in gasdynamics
Mechanics Research Communications, 1984In a preceding paper [The moving load on a string as free boundary problem (to be published)] the author treated a free boundary problem concerning the moving load on a string; now he uses his method to the resolution of this typical example of a free boundary problem in gasdynamics.
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A self-deactivating piston for a piston corer
Ocean Engineering, 1970Abstract Described is a piston containing an internal valve that is closed during penetration and open during extraction of the corer. It requires no cocking or other preparatory steps before use, and prevents liner collapse, core distortion, and consequent erroneous interpretation of the core materials as sometimes occurs when a conventional piston ...
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Constraint enforcement of piston motion in a free-piston engine
2014 American Control Conference, 2014Precise control of piston turnaround location is essential for reliable free-piston engine (FPE) operation. In this paper we derive a discrete-time, control-oriented, implicit model that describes FPE clearance height behavior by applying an energy balance to the Otto cycle.
Kevin Zaseck +2 more
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Study of the piston-rotation technique for piston-cylinder devices
Review of Scientific Instruments, 1978In piston-cylinder studies of reconstructive phase transitions, piston rotation plays a more subtle role than has previously been thought. Rotation of the piston not only relieves sliding friction, but also helps to activate sluggish transformations.
A B, Wolbarst, J B, Clark, P W, Richter
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