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Chapter 10
Axial and Leakage-Flow-Induced Vibrations

Excerpt

Under normal conditions, axial flow-induced vibrations of power and process plant components are of much less concern than cross-flow-induced vibrations with comparable flow velocities and fluid densities. Because of this and because industry research effort over the past 20 years has been focused on cross-flow-induced vibration, axial flow-induced vibration is often overlooked in the industry. A detailed review of the operating history of commercial nuclear power, in which detailed documentation of every flow-induced vibration incident is required by law and is available to the public, revealed that in the last 40 years, axial flow-induced vibration has caused as much monetary loss to the industry as cross-flow-induced fluid-elastic instability and vortex-induced vibration combined.

In the absence of narrow flow channels, axial flow-induced vibration can be estimated by three different methods:

1) The acceptance integral method developed in Chapter 8 for parallel-flow-induced vibration.

2) Equation of Wambsganss and Chen (1971) which estimates the minimum response of a rod or a tube subject to axial flow,

yrms(x)=0.0255κγD1.5DH1.5V2ψ(x)L0.5f1.5mtζ

3) Paidoussis' (1981) equation, which estimate the upper bound responses,

ymaxD=(5E4)Kα4{u1.6ε1.8Re0.251+u2}{DhD}0.4{β231+4β}

  • Summary
  • Nomenclature
  • 10.1 Introduction
  • 10.2 Turbulence-Induced Vibration in Axial Flow
  • 10.3 Some Simplified Equations for External Axial Flow
  • Example 10.1
  • Example 10.2
  • 10.4 Stability of Pipes Conveying Fluid
  • Buckling Instability
  • Example 10.3
  • 10.5 Leakage-Flow-Induced Vibration
  • Rules to Avoid Leakage-Flow-Induced Vibration
  • 10.6 Components Prone to Axial and Leakage-Flow-Induced Vibration
  • The Cavitating Venturi
  • The Common Faucet
  • Lift Check Valves
  • Tube-in-Tube Slip Joint
  • Reactor Control Rods
  • 10.7 Case Studies in Axial and Leakage-Flow-Induced Vibrations
  • Case Study 10.1: Boiling Water Reactor Thermal Shield
  • Case Study 10.2: Feedwater Sparger Thermal Sleeve
  • Case Study 10.3: Surveillance Specimen Holder Tube
  • Case Study 10.4: Kiwi Nuclear Rocket
  • References

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