National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Flow in the nozzle with moving wall
Foldyna, Josef ; Říha, Zdeněk ; Sitek, Libor
The paper presents simulation of 3D, unsteady, turbulent flow of water in the high-pressure nozzle device with moving wall. The wall performs rectilinear reciprocating motion with high frequency and very small amplitude that results in generation of very high velocity pulsations at the nozzle outlet. The pulsations lead to the break-up of continuous jet into regular slugs of water. The objective of the simulation was to verify whether dynamic meshes can be used to simulate above mentioned problem and satisfactory agreement of the simulation and reality can be obtained.
Quality of surface produced by modulated jet
Sitek, Libor ; Foldyna, Josef ; Jekl, Pavel ; Nováková, Daria
Machined surfaces can generally be characterized by surface texture or geometric parameters, which may also reflect subsurface features. The paper deals with the determination of quality of bottom surface of the kerf created by modulated jet. The quality of bottom surface of the kerf was examined and compared to that created by continuous jet at the same operating parameters. Shapes and sizes of kerfs created both by pulsed and continuous jets were also studied.
CFD model of modulated water jet
Foldyna, Josef ; Sitek, Libor
In this paper, results of CFD simulation of modulated jet break-up in the air are presented. The results are compared with results of visualization of modulated jets obtained in the laboratory experiments. In addition to that, results of simulation of modulated jet impact onto flat perpendicular surface are compared with laboratory measurement of stagnation force of modulated jet.

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