Transcript 2nd Progress Presentation.pptx

Summary Presentation
Masters Project
JEFFREY STACK
December 2011
December 2011
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Introduction
Problem Description
Methodology
Expected Results
Sizing of the Orifices
Numerical Solution for Orifice DP
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Reactor Coolant Pumps (RCPs)
◦ Provides Coolant to Reactor
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Testing Requirements
◦ Flow/Head, NPSH, HPP
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Challenges to Testing
◦ Conditions
◦ Very specific requirements
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Net Positive Suction Head (NPSH)
◦ Very low test loop pressures
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Harsh Testing Conditions for all Components
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Cavitation in Restriction Orifice
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Task – Dual Orifice System Design
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Hydraulic Design
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Structural Design
◦ Pressure, Temperature, NPSH conditions
◦ Large Δp & Large reduction in flow area
◦ To minimize flow area reduction
◦ Includes analytical sizing of flow diameter & comparison
with numerical results
◦ Includes static and dynamic analysis of the orifices
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Size Orifice & Determine Detailed Geometry
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Comparison with Numerical Results
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Create 3D Model
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Perform Static Structural Analysis
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Perform Dynamic Structural Analysis
◦ Using Idelchick’s “Handbook of Hydraulic Resistance”
◦ Using COMSOL Multiphysics
◦ Using ANSYS Workbench
◦ Using ANSYS Workbench by applying conservative results from the
orifice sizing or numerical results
◦ Using ANSYS Workbench to determine orifice natural frequencies
for comparison with typical RCP hydraulic pressure pulsations
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Using the required Δp of 663.5kPa to achieve
the high flow point, Orifice 1 is sized using
the following correlation from Idelchick
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Where Fo is the flow area of the orifice which
is solved for
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The inner diameter of Orifice 1 is determined
to be 0.551m
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To determine the required Δp for Orifice 2, a new
Δp of Orifice 1 is calculated for the low flow point
This new Orifice 1 Δp is subtracted from the total
(Orifice 1 & 2 combined) Δp of 1143.0kPa, which
is required to achieve the low flow point
The Orifice 2 Δp is determined to be 890.4kPa
Using the correlation on the previous slide, the
Orifice 2 inner diameter is determined to be
0.448m
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Model uses same inputs as analytical method
◦ Fluid properties & geometry
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Auto-meshing function of COMSOL is used
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