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Effect of initial turbulence intensity and velocity profile on liquid jets for IFE beamline protection

Summary: Effect of initial turbulence intensity and velocity profile on
liquid jets for IFE beamline protection
A. Konkachbaev 1, N.B. Morley, M.A. Abdou
Mechanical and Aerospace Engineering Department, UCLA 43-133 Engineering IV, Los Angeles, CA 90095-1597, USA
Current designs for thick liquid protection of heavy ion inertial fusion reactors utilize banks of liquid jets and vortex
flow tubes to protect sensitive beam line components from neutrons and debris following target explosions. These
hydraulic protection systems have issues regarding their formation and flow characteristics that need to be further
understood as part of the ongoing chamber technology program for IFE. In this paper, modeling and experimental
observations and quantitative data for rectangular and circular jets are compared in an effort to illuminate the critical
phenomena involved. For rectangular jets a variety of wave patterns have been observed owing to competing effects of
turbulence, surface tension and boundary layer formation in nozzles. Modeling of these jet flows using a Large Eddy
Simulation technique is a useful tool for understanding the various origin of these waves, and experimenting with
techniques to control their behavior. Recommendations for nozzle designs within IFE constraints are presented based
on the numerical simulations.
# 2002 Elsevier Science B.V. All rights reserved.
Keywords: Free surface jet; Turbulence; Droplet ejection; Velocity profile; Surface ripple
1. Introduction
The important issues for IFE chamber design
utilizing thick liquid wall protection include keep-


Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles


Collections: Plasma Physics and Fusion