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Journal of Engineering for Gas Turbines and Power | Volume 131 | Issue 3 | Research Paper
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
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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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+Experimental apparatus
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Experimental apparatus
Figure 1

Experimental apparatus

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+Swirler with a hub and stationary vanes: (a) bird’s-eye view and (b) side view
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Swirler with a hub and stationary vanes: (a) bird’s-eye view and (b) side view
Figure 2

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

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+POR
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POR
Figure 3

POR

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+POR shapes
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POR shapes
Figure 4

POR shapes

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+Pressure drop measurement
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Pressure drop measurement
Figure 5

Pressure drop measurement

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+POR section for PDA
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POR section for PDA
Figure 6

POR section for PDA

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+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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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
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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+Effects of JG and JL on δavg(z=170 mm)
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Effects of JG and JL on δavg(z=170 mm)
Figure 8

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

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+Effects of JG and JL on δmax(z=170 mm)
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Effects of JG and JL on δmax(z=170 mm)
Figure 9

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

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+Effects of the swirler on Ws∗
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Effects of the swirler on Ws∗
Figure 10

Effects of the swirler on Ws∗

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+Effects of the POR shape on Ws∗: (a) nonswirling flow and (b) swirling flow
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Effects of the POR shape on Ws∗: (a) nonswirling flow and (b) swirling flow
Figure 11

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

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+Pressure gradient: (a) nonswirling flow and (b) swirling flow
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Pressure gradient: (a) nonswirling flow and (b) swirling flow
Figure 12

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

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+Pressure drops of swirling flows in the barrel
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Pressure drops of swirling flows in the barrel
Figure 13

Pressure drops of swirling flows in the barrel

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+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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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
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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+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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Distribution of droplet diameter in swirling flow (z=246 mm, JG=14.6 m/s, and JL=0.08 m/s)
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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+Sauter mean diameter d32: (a) influence of JL and (b) influence of JG
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Sauter mean diameter d32: (a) influence of JL and (b) influence of JG
Figure 16

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

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+Mean vertical velocity uD of droplets: (a) influence of JL and (b) influence of JG
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Mean vertical velocity uD of droplets: (a) influence of JL and (b) influence of JG
Figure 17

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

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+Carry-under CU and carry-over CO: (a) carry-under and (b) carry-over
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Carry-under CU and carry-over CO: (a) carry-under and (b) carry-over
Figure 18

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

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