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RESEARCH PAPERS

Study of Laminar, Unsteady Piston-Cylinder Flows

[+] Author and Article Information
H. Ströll

Wehrtechnische Dienststelle für, Fernmeldewesen und Elektronik, D-91171 Greding, Germany

F. Durst, M. Perić

Lehrstuhl für Strömungsmechanik, Universität Erlangen-Nürnberg, Cauerstr. 4, D-91058 Erlangen, Germany

J. C. F. Pereira

Instituto Superior Tecnico, Avenido Rovisco Pais, 1096 Lisboa, Portugal

G. Scheuerer

Advanced Scientific Computing GmbH, Am Gangsteig 26, D-83607 Holzkirchen, Germany

J. Fluids Eng 115(4), 687-693 (Dec 01, 1993) (7 pages) doi:10.1115/1.2910200 History: Received March 02, 1992; Revised February 11, 1993; Online May 23, 2008

Abstract

The present paper concerns numerical investigation of a piston-driven, axisymmetric flow in a pipe assembly containing a sudden expansion. The piston closes the larger of the two pipes. The impulsively starting intake flow is the topic of this investigation. Results of numerical calculations and laser-Doppler measurements are presented to provide an insight into the features of the flow. The calculation procedure employed in this study is based on a finite-volume method with staggered grids and SIMPLE-algorithm for pressure-velocity coupling (Patankar and Spalding, 1972). The convection and diffusion fluxes in the Navier-Stokes equations are discretized with first order upwind and second order central differences, respectively. A fully implicit Euler scheme is used to discretize the temporal derivatives. The Navier-Stokes equations were suitably transformed to allow prediction of the flow within the inlet pipe (fixed grid) and cylinder region (moving grid) simultaneously (once-through procedure). Laser-Doppler measurements of both axial and radial velocity components were performed. Refractive index matching was used to eliminate the wall curvature effects. For each measuring point 20 cycles were measured, showing high repetition rates. Comparison of measured and predicted velocity profiles shows good agreement.

Copyright © 1993 by The American Society of Mechanical Engineers
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