Scaling of the wall-normal turbulence component in high-Reynolds-number pipe flow

摘要

Streamwise and wall-normal turbulence components are obtained in fully developed turbulent pipe over a Reynolds number range from 1.1 x 10(5) to 9.8 x 10(6). The streamwise intensity data are consistent with previous measurements in the same facility. For the wall-normal turbulence intensity, a constant region in v'(r.m.s) is found for the region 200 <= y(+) <= 0.1R(+) for Reynolds numbers up to 1.0 x 10(6). An increase in v'(r.m.s.) is observed below about y(+) similar to 100, although additional measurements will be required to establish its generality. The wall-normal spectra collapse in the energy-containing region with inner scaling, but for the low-wavenumber region a y/R dependence is observed, which also indicates a continuing influence from the outer flow on the near-wall motions.