Showing papers by "Vincenzo Dossena published in 1993"
TL;DR: In this paper, the results of an experimental investigation of the three-dimensional flow downstream of a linear turbine cascade at off-design conditions are described. But the results are limited to five incidence angles from − 60 to + 35 deg, and for three pitch-chord ratios: s/c = 0.58, 0.73, and 0.87.
Abstract: This paper describes the results of an experimental investigation of the three-dimensional flow downstream of a linear turbine cascade at off-design conditions. The tests have been carried out for five incidence angles from − 60 to + 35 deg, and for three pitch-chord ratios: s/c = 0.58, 0.73, 0.87. Data include blade pressure distributions, oil flow visualizations, and pressure probe measurements. The secondary flow field has been obtained by traversing a miniature five-hole probe in a plane located at 50 percent of an axial chord downstream of the trailing edge. The distributions of local energy loss coefficients, together with vorticity and secondary velocity plots, show in detail how much the secondary flow field is modified both by incidence and by cascade solidity variations
52 citations
24 May 1993
TL;DR: In this article, the effects induced by incidence angle and pitch-chord ratio variations on the three-dimensional turbulent flow downstream of a linear turbine cascade have been investigated, where detailed hot wire measurements have been performed on a plane located at 22 per cent of an axial chord downstream of the trailing edge, in order to determine the distribution of all the six Reynolds stress tensor components.
Abstract: An experimental investigation on a linear turbine cascade has been carried out to study the effects induced by incidence angle and pitch-chord ratio variations on the three-dimensional turbulent flow downstream of the cascade.Previous mean flow measurements have shown how these parameters influence the energy losses and the secondary velocity field. Now detailed hot wire measurements have been performed on a plane located at 22 per cent of an axial chord downstream of the trailing edge, in order to determine the distribution of all the six Reynolds stress tensor components, for three incidence conditions (i = −30, 0, +30 deg) and for three pitch-chord ratios (s/c = 0.58, 0.72, 0.87).Significant changes of the turbulent flow structure, interesting magnitude and distribution of the Reynolds stress components, have been observed for all the considered test conditions.The analysis of the results shows the correlation between the mean flow features and the turbulent quantities and the relationship between the energy loss production and the blade loading variation.The presented data are also suitable for assessing the behaviour of turbulence models in complex 3D flows, on design and off-design conditions.Copyright © 1993 by ASME
6 citations