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Title: PWR CORE 2 MODEL STUDIES TO IMPROVE INLETPLENUM-CHAMBER MIXING

Abstract

In the course of the PWR Core 2 study program, studies to improve mixing in the lower plenum were carried out using a quarter-scale air-flow model. By use of vanes to form a strong vortex in the lower plenum, excellent lower-plenum mixing was obtained with only slight increase in pressure drop. For the studies relating to a 9-ft core design, the model core was extended downward 4 1/2 in. below the Core I position. The flow baffle used for this configuration extended below the four inlets, with the result that considerable pressure loss occurred in the lower plenum. It was found that mixing could be greatly improved by use of deflectors to divert the inlet flow in a tangential direction. Data on lower- plenum mixing, core-flow distribution, thermal-shield-flow directions and velocities, flowbaffle orifice coefficients, and pressure losses were obtained for the 9-ft core configuration both with flow deflectors and without them. The flow deflectors greatly improved mixing at the expense of increased lowerplenum pressure loss. For the studies relating to a 7.5-ft core design, the core was extended downward 2 1/4 in. The flow baffle used for this core design extended to about the center line of the inlets, somore » that restriction of inlet flow was less than for the 9-ft core. Data for the basic configuration were obtained, following which many types of mixing devices were studied. Use of a vaned ring to produce a strong vortex in the lower plenum resulted in excellent mixing with only slight increase in pressure drop. A similar vaned ring was designed for the prototype by Westinghouse and incorporated in the quarter-scale model. Detailed studies of model performance proved this design satisfactory. (auth)« less

Authors:
; ;
Publication Date:
Research Org.:
Battelle Memorial Inst., Columbus, Ohio
OSTI Identifier:
4236870
Report Number(s):
BMI-1342
NSA Number:
NSA-13-015760
DOE Contract Number:  
W-7405-ENG-92
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
REACTORS; AERODYNAMICS; AIR; ANALOG SYSTEMS; CONFIGURATION; FINS; FLUID FLOW; GAS FLOW; LOSSES; MECHANICAL STRUCTURES; MIXING; NOZZLES; PLANNING; POWER PLANTS; PRESSURE; PWR; REACTOR CORE; TURBULENCE; VARIATIONS; ZONES

Citation Formats

Flanigan, L.J., Whitacre, G.R., and Hazard, H.R. PWR CORE 2 MODEL STUDIES TO IMPROVE INLETPLENUM-CHAMBER MIXING. United States: N. p., 1959. Web. doi:10.2172/4236870.
Flanigan, L.J., Whitacre, G.R., & Hazard, H.R. PWR CORE 2 MODEL STUDIES TO IMPROVE INLETPLENUM-CHAMBER MIXING. United States. doi:10.2172/4236870.
Flanigan, L.J., Whitacre, G.R., and Hazard, H.R. Fri . "PWR CORE 2 MODEL STUDIES TO IMPROVE INLETPLENUM-CHAMBER MIXING". United States. doi:10.2172/4236870. https://www.osti.gov/servlets/purl/4236870.
@article{osti_4236870,
title = {PWR CORE 2 MODEL STUDIES TO IMPROVE INLETPLENUM-CHAMBER MIXING},
author = {Flanigan, L.J. and Whitacre, G.R. and Hazard, H.R.},
abstractNote = {In the course of the PWR Core 2 study program, studies to improve mixing in the lower plenum were carried out using a quarter-scale air-flow model. By use of vanes to form a strong vortex in the lower plenum, excellent lower-plenum mixing was obtained with only slight increase in pressure drop. For the studies relating to a 9-ft core design, the model core was extended downward 4 1/2 in. below the Core I position. The flow baffle used for this configuration extended below the four inlets, with the result that considerable pressure loss occurred in the lower plenum. It was found that mixing could be greatly improved by use of deflectors to divert the inlet flow in a tangential direction. Data on lower- plenum mixing, core-flow distribution, thermal-shield-flow directions and velocities, flowbaffle orifice coefficients, and pressure losses were obtained for the 9-ft core configuration both with flow deflectors and without them. The flow deflectors greatly improved mixing at the expense of increased lowerplenum pressure loss. For the studies relating to a 7.5-ft core design, the core was extended downward 2 1/4 in. The flow baffle used for this core design extended to about the center line of the inlets, so that restriction of inlet flow was less than for the 9-ft core. Data for the basic configuration were obtained, following which many types of mixing devices were studied. Use of a vaned ring to produce a strong vortex in the lower plenum resulted in excellent mixing with only slight increase in pressure drop. A similar vaned ring was designed for the prototype by Westinghouse and incorporated in the quarter-scale model. Detailed studies of model performance proved this design satisfactory. (auth)},
doi = {10.2172/4236870},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1959},
month = {5}
}