Abstract
Hot-wire measurements made with different single-wire probe configurations in a highly curved wall jet showed strong interference effects even on those probes which were optimised in other flow regimes regarding aerodynamic interference. It turned out that a probe with a stem normal to the mean flow indicated values which were too high for the mean velocity and too low for the turbulent fluctuations, i.e. (u'2)12/. The opposite was true for probes with the stem nearly parallel to the mean flow. Both were valid only in the near-wall region y<or approximately=4 mm. In the first case, only the prongs were responsible for the errors, in the second case prongs and stem caused the interference. Quantitatively the effect depended upon the structure of the wall boundary layer. For a specified structure (that means a transitioning boundary layer with turbulent spots) a hot-wire probe was developed which minimised the aerodynamic interference in that given case.