Pressure velocity coupling n a subsonic round jet

摘要

An experimentl investigation involving simultaneous measurements of the radial distribution of velocity within the shear layer of a jet and the lognitudinal distribution of pressure surrounding a jet is performed The use of two statistical approaches (proper orthogonal decomposition, POD and linear stochastic estimation, LSE) permits the analysis, in terms of vortical structures, of the pressure fluctuations surrounding the jet. These structures are fond to be responsible for the far-field noise emission. This method thus seems promising for providing a "structural model" of the turbulent flow fiedl.