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- W2740572511 abstract "The aim of the presented experiments is to experimentally characterize an innovative, semi-active system for turbulence stimulation by comparing the obtained flow properties with that of a passive grid. The traditional method of generating turbulence, for instance in a wind tunnel is to insert a passive grid into the air flow. The main drawback is that only low velocity fluctuations can typically be obtained in this manner. Now, higher turbulent intensities can be achieved by using actively controlled grids. In contrast to passive systems they contain usually many movable flaps fixed on horizontal and vertical axes, which can independently be driven at high speed by electrical motors. Combined with stochastic geometries, this active system is very efficient but extremely costly and not very robust. As a possible cost-effective alternative, flexible tubes are fixed in the present project at the intersection points of a passive grid and set into motion by an high-pressure air flow. The complex interaction between grid turbulence in the main flow, interaction with many small air jets and material flexibility of the tubes should lead globally to chaotic properties and strong fluctuations in the resulting flow. Turbulence intensity, turbulent kinetic energy and energy dissipation rate have been quantified using Particle Image Velocimetry (PIV). For comparison, three different experiments have been carried out: 1) examination of the original main flow, 2) main flow modified by passive grid only and 3) main flow excited by passive grid and flexible jet tubes. The nearly uniform main flow of 1) was produced by an air ejector. The mean streamwise velocity at the end of the setup was set to roughly the same value in all cases. The PIV data were evaluated by the commercial software Dynamic Studio (co. Dantec Dynamics), before post-processing the resulting vector fields with MATLAB.As a result of this experimental work it has been shown that using silicon tubes, turbulence intensity and turbulent kinetic energy may be considerably increased. The proposed system appears to work in a suitable manner and will be characterized in more details in future projects." @default.
- W2740572511 created "2017-08-08" @default.
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- W2740572511 date "2012-06-27" @default.
- W2740572511 modified "2023-09-27" @default.
- W2740572511 title "Experimental characterization of a cost-effective semi-active grid for turbulence stimulation" @default.
- W2740572511 hasPublicationYear "2012" @default.
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