On the three-dimensional precessing jet flow past a sudden expansion

• Published in: Experiments in fluids Vol. 55; no. 2
• Main Authors: Cafiero, Gioacchino, Ceglia, Giuseppe, Discetti, Stefano, Ianiro, Andrea, Astarita, Tommaso, Cardone, Gennaro
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.02.2014; Springer
• Subjects: Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics; Exact sciences and technology; Fluid dynamics; Fluid- and Aerodynamics; Fundamental areas of phenomenology (including applications); Heat and Mass Transfer; Instrumentation for fluid dynamics; Jets; Physics; Research Article; Turbulent flows, convection, and heat transfer; Proper Orthogonal Decomposition; Proper Orthogonal Decomposition Mode; Nozzle Exit; Strouhal Number; Shear Layer; Test facilities; Precession; Three dimensional flow; Orthogonal function; Circular jet; Vortices; Tomography; Eigenfunctions; Particle image velocimetry; Experimental study; Velocity measurement; Sudden enlargement

A circular jet flow past an abrupt expansion under some conditions switches intermittently between two states: quasi-axisymmetric expansion and gyroscopic-like precessing motion. In this work, an experimental investigation into the self-excited precessing flow generated by a 5:1 expansion of a round...