초록 ▼

Acoustic pulsations in fluid transmission systems such as gas pipelines, engine exhaust systems and compressed air networks are suppressed by an acoustic filter comprising an enlarged pressure vessel with inlet and outlet conduits arranged such that conduit inlet and outlet openings are at the press

Acoustic pulsations in fluid transmission systems such as gas pipelines, engine exhaust systems and compressed air networks are suppressed by an acoustic filter comprising an enlarged pressure vessel with inlet and outlet conduits arranged such that conduit inlet and outlet openings are at the pressure node of standing pressure waves of the pressure vessel length resonant frequency and odd or even harmonics of the fundamental frequency. The inlet and outlet conduit openings are arranged such that the direction of convection flow and acoustic pulsation modulating flow is transverse to the instantaneous particle velocity of fluid resulting from acoustic pulsations existing in or excitable in the pressure vessel. Inlet and outlet conduits preferably open into the pressure vessel in a generally radial direction with respect to the central longitudinal axis of the vessel.

대표청구항 ▼

Apparatus for minimizing the transmission of acoustic pulsations in a fluid transmission system comprising: means forming an elongated pressure vessel closed at opposite ends by opposed endwalls and forming an enclosed chamber having an acoustic length; a first fluid conduit having means forming an

Apparatus for minimizing the transmission of acoustic pulsations in a fluid transmission system comprising: means forming an elongated pressure vessel closed at opposite ends by opposed endwalls and forming an enclosed chamber having an acoustic length; a first fluid conduit having means forming an opening into said chamber; a second fluid conduit having means forming an opening into said chamber whereby fluid may be transmitted between said conduits through said pressure vessel; and said means forming said openings of said conduits each, respectively, are disposed in said pressure vessel at substantially the maximum amplitude of a fluid particle velocity wave corresponding to a standing pressure wave of a selected resonant frequency of which said pulsations are to be minimized and said means forming said openings in said first and second conduits are each disposed so as to cause fluid flow in a direction substantially transverse to the fluid particle velocity to minimize coupling of kinetic energy between fluid in said pressure vessel and said conduits, respectively.