The behavior of a vortex flow through a Laval nozzle was studied in connection with the purification of natural gas. By creating a vortex and passing it through a Laval nozzle, the gas will be cooled, and water droplets will form and will be centrifuged out of the gas. This system is named the Condi-Cyclone. An analytical theory is developed to reveal the most important phenomena of the flow, to first order accuracy. Experiments have been performed with a prototype of the Condi-Cyclone. A Euler numerical simulation was performed, using the geometry of the test channel. This paper presents an analytical theory for a vortex flow through a Laval nozzle. It will demonstrate that when a vortex is present the total velocity reaches sonic conditions upstream of the nozzle throat, that the axial component of the velocity in the nozzle throat is equal to the local speed of sound and that the mass flow through the Laval nozzle decreases with increasing vortex strength. The predictions of the analytical theory have been compared with the results of the experiments and the Euler numerical simulation, and it can be concluded that the analytical theory describes the main characteristics of the flow very well.
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April 2009
Research Papers
Choking Phenomena in a Vortex Flow Passing a Laval Tube: An Analytical Treatment
Theo Van Holten,
Theo Van Holten
Department of Design, Integration and Operation of Aircraft and Rotorcraft, Faculty of Aerospace Engineering,
e-mail: t.vanholten@tudelft.nl
Delft University of Technology
, Kluyverweg 1, 2629 HS Delft, The Netherlands
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Monique Heiligers,
Monique Heiligers
Department of Design, Integration and Operation of Aircraft and Rotorcraft, Faculty of Aerospace Engineering,
Delft University of Technology
, Kluyverweg 1, 2629 HS Delft, The Netherlands
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Annemie Jaeken
Annemie Jaeken
Department of Design, Integration and Operation of Aircraft and Rotorcraft, Faculty of Aerospace Engineering,
Delft University of Technology
, Kluyverweg 1, 2629 HS Delft, The Netherlands
Search for other works by this author on:
Theo Van Holten
Department of Design, Integration and Operation of Aircraft and Rotorcraft, Faculty of Aerospace Engineering,
Delft University of Technology
, Kluyverweg 1, 2629 HS Delft, The Netherlandse-mail: t.vanholten@tudelft.nl
Monique Heiligers
Department of Design, Integration and Operation of Aircraft and Rotorcraft, Faculty of Aerospace Engineering,
Delft University of Technology
, Kluyverweg 1, 2629 HS Delft, The Netherlands
Annemie Jaeken
Department of Design, Integration and Operation of Aircraft and Rotorcraft, Faculty of Aerospace Engineering,
Delft University of Technology
, Kluyverweg 1, 2629 HS Delft, The NetherlandsJ. Fluids Eng. Apr 2009, 131(4): 041201 (7 pages)
Published Online: March 6, 2009
Article history
Received:
July 28, 2006
Revised:
January 31, 2008
Published:
March 6, 2009
Citation
Van Holten, T., Heiligers, M., and Jaeken, A. (March 6, 2009). "Choking Phenomena in a Vortex Flow Passing a Laval Tube: An Analytical Treatment." ASME. J. Fluids Eng. April 2009; 131(4): 041201. https://doi.org/10.1115/1.3089532
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