The PIV study of air flow past the counter-swirler 53983

Abstract

PIV (particle image velocimetry) measurement of the air flow past a counter-swirler 53983 (anticlockwise swirler surrounded by clockwise swirler) is performed. The measurement is focused to an area at the boundary between the inner swirling jet and the outer one rotating oppositely. The Reynolds number Re based on the inner swirler diameter ranged form 1.2·103 to 2.1·104. By using band pass filtering the shear layer and vortices in the contact region between counter-swirling jets is highlighted. The shear layer between these regions shortens and decays into vortices as Reynolds number increases.

Turbulent jet stability increased by ribs inside the nozzle – Stereo PIV measurement one diameter past the nozzle

“…In addition, what happens, when we twist the ribs? The swirling jets generally opens faster due to centrifugal forces [20,21].…”

Particle image velocimetry measurement of turbulent wake past circular cylinder at Reynolds numbers from 2.5·103to 1.5·104

“…This PIV system has been used for many measurements in the past, for example the flow inside an axial single stage-turbine [3,31], which was not so easy as it sounds [32]. From the laboratory experiments, this system participated in the measurement of secondary flow in a corner of channel [33], measurement of turbulent mixing past a grid [34] and past a strangeshaped counter-swirler [16] or in a turbulent jet [35].…”

“…This setup is very simplified and for a practical purposes a more complex prismatic obstacle (or profile) is used [13,14]. Of course, a nonprismatic obstacles are studied as well [15,16], but this approach usually needs a more complex Stereo Particle Image Velocimetry technique [17,18], while here we use this method only in its 2D configuration, which still offers a deep insight into the physics of the flow [19].…”

Vortices inside a single-stage axial air turbine captured by Particle Image Velocimetry

“…The airflow is driven by a powerful radial 12-stage ČKD compressor with input power of 1.3 MW [9]. We use the optical non-intrusive method Particle Image Velocimetry (PIV) [10,11,12]. We measure the area of size 28 × 28 mm just behind the rotor wheel, the area is oriented in axial × tangential direction, therefore the wake system is well observable, see Fig.…”