Comparison of single and X-wire measurements of streamwise velocity fluctuations in turbulent boundary layer

• Autorzy: Dróżdż A. , Elsner W.
• Języki publikacji: EN

Abstrakty

EN

The paper discusses the problem of measuring velocity fluctuations of a turbulent boundary layer using single and X-wire probes. It seems that the difference between the streamwise fluctuating component of these two probes results not only from spatial resolution, but also from influence of the wall-normal fluctuating component, which is usually not considered. It was shown that the vector summing these two components obtained from X-wire probe gives the shape of fluctuation distribution obtained from a single-wire probe. It implies that the underestimation of the near-wall peak of streamwise fluctuating component in X-wire measurements results from disregarded wall-normal fluctuations, which is obviously taken in the case of a single-wire probe. Moreover, it was shown that the criteria for wire length i.e. l⁺ ≤ 20 could not be sufficient to properly estimate the streamwise and wall-normal fluctuations.

Słowa kluczowe

EN

turbulent boundary layer; energy spectra; hot-wire spatial resolution

• Wydawca: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Journal of Theoretical and Applied Mechanics
• Rocznik: 2014
• Tom: Vol. 52 nr 2
• Strony: 499--505
• Opis fizyczny: Bibliogr. 14 poz., rys., tab.

Twórcy

autor

Dróżdż A.

• Czestochowa University of Technology, Institute of Thermal Machinery, Częstochowa, Poland

autor

Elsner W.

• Czestochowa University of Technology, Institute of Thermal Machinery, Częstochowa, Poland

Bibliografia

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