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Cryogenic Liquid Jets for High Repetition Rate Discovery Science

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Flow-structure interaction effects on a jet emanating from a flexible nozzle.

S Murugappan, E J Gutmark, R R Lakhamraju

Physics of Fluids (Woodbury, N.Y. : 1994)

|June 24, 2009

Summary

Pulsed jets from flexible nozzles create self-excited flows. Two distinct modes, flapping and symmetric, were observed, influencing jet steering and spread.

Area of Science:

Fluid Dynamics
Acoustics and Optics

Background:

Pulsed jets are increasingly used for flow control applications.
Flexible nozzles offer novel methods for generating pulsed jets.

Purpose of the Study:

To investigate the flow field and mixing characteristics of an incompressible elongated jet from a flexible nozzle.
To analyze the self-excited pulsatile flow generated by the nozzle's deformation.

Main Methods:

Experimental study of an elongated jet emitted from a high aspect ratio flexible nozzle.
Characterization of jet dynamics through measurements of excitation frequency and Strouhal number.
Analysis of vortex shedding and flow modes (flapping and symmetric).

Main Results:

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The jet exhibited self-excited pulsatile flow with frequencies between 150-175 Hz (Strouhal number 0.17-0.45).

Two distinct flow modes were identified: a flapping mode with alternate vortex shedding causing jet steering, and a symmetric mode with counter-rotating vortex pairs.

The flapping mode resulted in significantly larger turbulence and jet spread compared to the symmetric mode.

Conclusions:

Flexible nozzle geometry and flow conditions dictate jet behavior, enabling control over jet steering and spread.
Understanding these flow modes is crucial for optimizing pulsed jet applications in flow control.