Research Papers: Nuclear Power

Swirling Annular Flow in a Steam Separator

[+] Author and Article Information
Hironobu Kataoka, Yusuke Shinkai, Shigeo Hosokawa, Akio Tomiyama

Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan

J. Eng. Gas Turbines Power 131(3), 032904 (Feb 18, 2009) (7 pages) doi:10.1115/1.3078701 History: Received August 21, 2008; Revised August 22, 2008; Published February 18, 2009

Effects of pick-off ring configuration on the separator performance of a downscaled model of a steam separator for a boiling water nuclear reactor are examined using various types of pick-off rings. The experiments are conducted using air and water. Pressure drops in a barrel and a diffuser and diameters and velocities of droplets at the exit of the barrel are measured using differential pressure transducers and particle Doppler anemometry, respectively. The separator performance does not depend on the shape of the pick-off ring but strongly depends on the width of the gap between the pick-off ring and the barrel wall. The pressure drop in the barrel is well evaluated using the interfacial friction factor for unstable film flows. Carry-under can be estimated using a droplet velocity distribution at the exit of the separator.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 10

Effects of the swirler on Ws∗

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Figure 9

Effects of JG and JL on δmax(z=170 mm)

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Figure 1

Experimental apparatus

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Figure 2

Swirler with a hub and stationary vanes: (a) bird’s-eye view and (b) side view

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Figure 5

Pressure drop measurement

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Figure 6

POR section for PDA

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Figure 7

Annular flow in the diffuser and barrel (JG=14.6 m/s and JL=0.08 m/s): (a) without a swirler and (b) with a swirler

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Figure 8

Effects of JG and JL on δavg(z=170 mm)

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Figure 16

Sauter mean diameter d32: (a) influence of JL and (b) influence of JG

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Figure 11

Effects of the POR shape on Ws∗: (a) nonswirling flow and (b) swirling flow

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Figure 12

Pressure gradient: (a) nonswirling flow and (b) swirling flow

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Figure 13

Pressure drops of swirling flows in the barrel

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Figure 14

Gas core flows at the exit of the barrel (JG=14.6 m/s and JL=0.08 m/s): (a) nonswirling flow and (b) swirling flow

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Figure 17

Mean vertical velocity uD of droplets: (a) influence of JL and (b) influence of JG

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Figure 18

Carry-under CU and carry-over CO: (a) carry-under and (b) carry-over

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Figure 15

Distribution of droplet diameter in swirling flow (z=246 mm, JG=14.6 m/s, and JL=0.08 m/s)



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