Performance of a 12-sensor vorticity probe in the near field of a rectangular turbulent jet

“…The performance of the developed vorticity Fig. 3 In-house manufactured, 12-hot-wire vorticity probe probe has been tested in a rectangular jet flow by Cavo et al [9] with satisfactory results. A brief description of the technique is presented next focusing on specific aspects of the present application.…”

Section: The Experiments Setupmentioning

confidence: 93%

“…Their work is the starting point of the techniques used in the herein presented work and will be discussed extensively in the following, along with the work of Cavo et al [9] who shared the measuring equipment of the present work studying a rectangular jet. …”

Section: Multi Sensor Hwa For Vorticity Measurementsmentioning

confidence: 98%

“…A brief description of the technique is presented next focusing on specific aspects of the present application. More details and justification of the general features can be found in Cavo et al [9]. The 12 wires of the probe form a sensing area of approximately 2.1 mm diameter.…”

Section: The Experiments Setupmentioning

confidence: 99%

“…Values between the equidistant grid points are interpolated by means of 3D Bezier polynomials. Calibration methodology is extensively described in Lemonis and Dracos [38], Cavo et al [9].…”

Section: The Experiments Setupmentioning

confidence: 99%

See 2 more Smart Citations

Multisensor Hot Wire Vorticity Probe Measurements of the Formation Field of Two Corotating Vortices

Romeos

Lemonis

Papailiou

2009

Flow Turbulence Combust

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Experimental evidence is reported, regarding the formation of a pair of co-rotating tip vortices by a split wing configuration, consisting of two half wings at equal and opposite angles of attack. Simultaneous measurements of the threedimensional vector fields of velocity and vorticity were conducted on a cross plane at a downstream distance corresponding to 0.3 cord lengths (near wake), using an in-house constructed 12-sensor hot wire anemometry vorticity probe. The probe consists of three closely separated orthogonal 4-wire velocity sensor arrays, measuring simultaneously the three-dimensional velocity vector at three closely spaced locations on a cross plane of the flow filed. This configuration makes possible the estimation of spatial velocity derivatives by means of a forward difference scheme of first order accuracy. Velocity measurements obtained with an X-wire are also presented for comparison. In this near wake location, the flow field is dictated by the pressure distribution established by the flow around the wings, mobilizing large masses of air and leading to the roll up of fluid sheets. Fluid streams penetrating between the wings collide, creating on the cross plane flow a stagnation point and an "impermeable" line joining the two vortex centres. Along this line fluid is directed towards the two vortices, expanding their cores and increasing their separation distance. This feeding process generates a dipole of opposite sign streamwise mean vorticity within each vortex. The rotational flow within the vortices obligates an adverse streamwise pressure gradient leading to a significant streamwise velocity deficit characterizing the vortices. The turbulent flow field is the result of temporal changes in the intensity of the vortex formation and changes in the position of the cores (wandering).

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Thermal Anemometry: An Introduction and Special Topics

Andreopoulos

2010

Encyclopedia of Aerospace Engineering

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The basic principles and practices of thermal anemometry are presented and discussed. Modes of operation include constant temperature, constant current, and constant voltage. Models of the transfer function are considered for single and multiple hot‐wire probes which include techniques to measure vorticity, rate of strain, and dissipation rate of kinetic energy in incompressible and compressible flows. The response of hot wires to pitch and yaw variations of the incoming velocity vector is also addressed. Owing to its high‐frequency response, good spatial resolution, and relatively inexpensive hardware acquisition cost, thermal anemometry techniques appear to be widely used in the measurements of time‐dependent flow velocity, mass flux, or temperature.

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Performance of a 12-sensor vorticity probe in the near field of a rectangular turbulent jet

Cited by 14 publications

References 41 publications

The effect of sidewalls on rectangular jets

The effect of sidewalls on rectangular jets

Multisensor Hot Wire Vorticity Probe Measurements of the Formation Field of Two Corotating Vortices

Thermal Anemometry: An Introduction and Special Topics

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