THE EFFECT OF AIR IN DAMPING WATER BORNE PRESSURE PULSES

Abstract

The effect of injection of up to 10% by volume air in damping the amplitude of water borne pressure pulses was studied. Pressure pulses were generated using a water hammer model. The water hammer model consisted of a length of pipe with water flowing through it and a quick closing valve located downstream. Measured amounts of air were injected into a water stream and the valve was quickly closed. The pressure-time history was recorded on oscilloscope photographs at two locations along the pipe. A mathematical model was developed for this two phase model. Small amounts of air greatly reduced the amplitude of the pressure pulses. By injection of 1% by volume of air into the model at 15.5 psia, the pressure amplitude was reduced to 8.6% of the theoretical no air amplitude. The effect decreased with increased pressure of the system.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1964
Accession Number
AD0481353

Entities

People

  • William A. Rehder

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Flow
  • Amplitude
  • Bulk Modulus
  • Cameras
  • Flow
  • Flow Rate
  • Frequency
  • Gate Valves
  • Mass Flow
  • Measurement
  • Mechanical Engineering
  • Modulus Of Elasticity
  • Oscilloscopes
  • Photographs
  • Pressure Transducers
  • United States
  • Water Hammer

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Combustion Dynamics and Shock Wave Physics.
  • Internal Combustion Engine (ICE) Technology.