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Title: Shock wave absorber having a deformable liner

Abstract

This invention discloses a shock wave absorber for a piping system carrying liquid. The absorber has a plastically deformable liner defining the normal flow boundary for an axial segment of the piping system, and a nondeformable housing is spaced outwardly from the liner so as to define a gas-tight space therebetween. The flow capacity of the liner generally corresponds to the flow capacity of the piping system line, but the liner has a noncircular cross section and extends axially of the piping system line a distance between one and twenty times the diameter thereof. Gas pressurizes the gas-tight space equal to the normal liquid pressure in the piping system. The liner has sufficient structural capacity to withstand between one and one-half and two times this normal liquid pressures; but at greater pressures it begins to plastically deform initially with respect to shape to a more circular cross section, and then with respect to material extension by circumferentially stretching the wall of the liner. A high energy shock wave passing through the liner thus plastically deforms the liner radially into the gas space and progressively also as needed in the axial direction of the shock wave to minimize transmission of themore » shock wave beyond the absorber.« less

Inventors:
; ; ; ;
Publication Date:
OSTI Identifier:
6897955
Application Number:
ON: DE84011308
Assignee:
Dept. of Energy ERA-09-029022; EDB-84-093735
DOE Contract Number:
W-31-109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; PIPES; SHOCK ABSORBERS; DESIGN; DEFORMATION; FLUID FLOW; LINERS; SHOCK WAVES 420400* -- Engineering-- Heat Transfer & Fluid Flow

Citation Formats

Youngdahl, C.K., Wiedermann, A.H., Shin, Y.W., Kot, C.A., and Ockert, C.E. Shock wave absorber having a deformable liner. United States: N. p., 1983. Web.
Youngdahl, C.K., Wiedermann, A.H., Shin, Y.W., Kot, C.A., & Ockert, C.E. Shock wave absorber having a deformable liner. United States.
Youngdahl, C.K., Wiedermann, A.H., Shin, Y.W., Kot, C.A., and Ockert, C.E. 1983. "Shock wave absorber having a deformable liner". United States. doi:.
@article{osti_6897955,
title = {Shock wave absorber having a deformable liner},
author = {Youngdahl, C.K. and Wiedermann, A.H. and Shin, Y.W. and Kot, C.A. and Ockert, C.E.},
abstractNote = {This invention discloses a shock wave absorber for a piping system carrying liquid. The absorber has a plastically deformable liner defining the normal flow boundary for an axial segment of the piping system, and a nondeformable housing is spaced outwardly from the liner so as to define a gas-tight space therebetween. The flow capacity of the liner generally corresponds to the flow capacity of the piping system line, but the liner has a noncircular cross section and extends axially of the piping system line a distance between one and twenty times the diameter thereof. Gas pressurizes the gas-tight space equal to the normal liquid pressure in the piping system. The liner has sufficient structural capacity to withstand between one and one-half and two times this normal liquid pressures; but at greater pressures it begins to plastically deform initially with respect to shape to a more circular cross section, and then with respect to material extension by circumferentially stretching the wall of the liner. A high energy shock wave passing through the liner thus plastically deforms the liner radially into the gas space and progressively also as needed in the axial direction of the shock wave to minimize transmission of the shock wave beyond the absorber.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1983,
month = 8
}
  • The shock or energy absorber disclosed herein utilizes an apertured plate maintained under the normal level of liquid flowing in a piping system and disposed between the normal liquid flow path and a cavity pressurized with a compressible gas. The degree of openness (or porosity) of the plate is between 0.01 and 0.60. The energy level of a shock wave travelling down the piping system thus is dissipated by some of the liquid being jetted through the apertured plate toward the cavity. The cavity is large compared to the quantity of liquid jetted through the apertured plate, so there ismore » little change in its volume. The porosity of the apertured plate influences the percentage of energy absorbed.« less
  • The shock or energy absorber disclosed herein utilizes an apertured plate maintained under the normal level of liquid flowing in a piping system and disposed between the normal liquid flow path and a cavity pressurized with a compressible gas. The degree of openness (or porosity) of the plate is between 0.01 and 0.60. The energy level of a shock wave travelling down the piping system thus is dissipated by some of the liquid being jetted through the apertured plate toward the cavity. The cavity is large compared to the quantity of liquid jetted through the apertured plate, so there ismore » little change in its volume. The porosity of the apertured plate influences the percentage of energy absorbed.« less
  • The shock or energy absorber disclosed herein utilizes an apertured plate maintained under the normal level of liquid flowing in a piping system and disposed between the normal liquid flow path and a cavity pressurized with a compressible gas. The degree of openness (or porosity) of the plate is between 0.01 and 0.60. The energy level of a shock wave travelling down the piping system thus is dissipated by some of the liquid being jetted through the apertured plate toward the cavity. The cavity is large compared to the quantity of liquid jetted through the apertured plate, so there ismore » little change in its volume. The porosity of the apertured plate influences the percentage of energy absorbed.« less
  • A laser mirror is described having a cooled, deformable reflecting surface. The mirror is comprised of: a thin faceplate having a central region capable of being selectively deformed by the application of mechanical forces; a base manifold including means for distributing coolant toward the faceplate and means for collecting coolant which has been circulated through one or more enclosed spaces; actuators located between the second, bottom side of faceplate and base manifold, the actuators being selectively operable by the application of signals to elongate the actuators and to impart mechanical forces to effect the selective deformation of the reflecting surfacemore » of the faceplate; at least two of the actuators are coolant-carrying actuators, the coolant-carrying actuators having passages to permit coolant to be transferred between the faceplate and the base manifold; means for circulating coolant toward and away from the base manifold; and faceplate is cooled by coolant circulating from base manifold through coolant-carrying actuators to the faceplate and through at least one of elongated spaces in the faceplate and back to the base manifold through at least a second of the coolant-carrying actuators.« less
  • An open apex shape charge explosive device is disclosed having an inner liner defining a truncated cone, an explosive charge surrounding the truncated inner liner, a primer charge, and a disc located between the inner liner and the primer charge for directing the detonation of the primer charge around the end edge of the disc means to the explosive materials surrounding the inner liner. The disc comprises a material having one or more of: a higher compressive strength, a higher hardness, and/or a higher density than the material comprising the inner liner, thereby enabling the disc to resist deformation untilmore » the liner collapses. The disc has a slide surface thereon on which the end edge of the inner liner slides inwardly toward the vertical axis of the device during detonation of the main explosive surrounding the inner liner, to thereby facilitate the inward collapse of the inner liner. In a preferred embodiment, the geometry of the slide surface is adjusted to further control the collapse or .beta. angle of the inner liner.« less