The decay power law in turbulence generated by grids

• Autorzy: Grzelak J. , Wierciński Z.
• Języki publikacji: EN

Abstrakty

EN

It is well known that turbulence in the flow can be characterized by two main parameters: the intensity and scale (such as macro- or microscale of length, time or speed). Turbulence in wind tunnels can be generated by a variety of means (placed perpendicularly to the flow) like passive and active grids, most often grids of round or square wires, perforated plates and so on. The aim of this study is to gain a detailed knowledge of the degree of turbulence isotropy and homogeneity in the flow behind the grids of variable geometry. For this purpose, skewness and kurtosis of the velocity fluctuations and also transverse variation for five grids of different parameters were determined. Additionally, some new results on the influence of the initial conditions of turbulence generation on the decay law of turbulence are given.

Słowa kluczowe

EN

turbulence generation; turbulence intensity; grid; isotropy; homogeneity

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2015
• Tom: nr 130
• Strony: 93--107
• Opis fizyczny: Bibliogr. 28 poz., rys., tab.

Twórcy

autor

Grzelak J.

• The Szewalski Institute of Fluid Flow Machinery Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

autor

Wierciński Z.

• The Szewalski Institute of Fluid Flow Machinery Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

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