Abstract:
Ein Schalldämpfer (1) weist mindestens einen von einem gasdurchströmten Gaskanal (11) auf, in dem mindestens ein helikaler Einbau (4) vorgesehen ist, der einem Innenbereich (10) des Gaskanals einen schraubenförmigen Verlauf verleiht. Mittels des mindestens einen helikalen Einbaus (4) ist in dem Gaskanal (11) ein Resonator (13) ausgebildet, der von Schallwellen angeregt wird, welche sich in dem strömenden Gas ausbreiten.
Abstract:
The invention concerns a resonance exhaust silencer for 2-stroke internal combustion engines which has an axially symmetrical resonator housing (1) into which an inlet connection piece (8) leads and which in turn leads into an outlet pipe (4) containing a silencer. In the direction of flow the resonator housing (1) delimits in succession a divergent diffuser section (13), optionally an intermediate section (14) of constant flow cross-section, and a converging reflector section (15). The outlet pipe (4) passes coaxially through the resonator housing (1) and the inlet connection piece (8) opens tangentially into the diffuser section (13).
Abstract:
Low pressure pulses are generated intermittently in the exhaust gases in the exhaust-silencer system of the engine, to produce a standing wave of alternating high and low pressure. This is achieved by means of a turbulence unit designed to be fitted in an ordinary exhaust-silencer system, said unit accelerating the exhaust gases so that a strong momentary vacuum is produced when the exhaust valve is closed. The turbulence unit comprises in principle a cylindrical pipe (11), a spiral element (14) arranged centrally in the pipe, and a gap (15) arranged between the edges of the spiral element (14) and the inner surface of the pipe (11).
Abstract:
The present invention is an active internal combustion engine exhaust noise reduction system optionally capable of harvesting acoustic energy from the exhaust stream. Salient features include at least one controllably movable reaction element, preferably designed to minimize exhaust back pressure while converting pressure and velocity variations to electrical energy.
Abstract:
A vortex flow apparatus including a cylindrical housing that contains a fluid that flows in a swirling circular path. The apparatus may be utilized as a muffler for a combustion engine, a particle separator, or an energy conversion device that physically or chemically acts upon the fluid flow and particles contained within the apparatus. The housing defines an inlet opening that opens into the first end of the housing proximate a first end wall. An outlet tube defines an outlet opening through a first end wall. A projection is attached to a second end wall of the housing and extends into the housing. The outlet tube and projection are aligned with and centered relative to a central axis.
Abstract:
The invention presents a sound dampening flow channel device defining at least one flow channel (2) having an inlet opening (3) and an outlet opening (4), the flow channel (2) being at least partly delimited by at least one acoustic energy dissipative wall (5, 6). The outlet opening (4) of the flow channel (2) can not be seen from the inlet opening (3) and vice versa. Preferably, the acoustic energy dissipative wall (5, 6) presents, in relation to the interior of the flow channel (2), a smooth curvature.
Abstract:
Eine Vorrichtung zur Schalldämpfung in einem Rohrkanal (2), insbesondere einem gasführenden Kanal (2) einer Brennkraftmaschine (1), weist in einem Streckenabschnitt des Rohrkanals (2) mindestens einen paralell zu einem Hauptkanal (6) geführten Bypasskanal (5) auf. Dieser Bypasskanal (5) besitzt eine längere Wegstrecke zwischen einer Abzweigung (7) und einer Einmündung (8) als der Hauptkanal (6). Um den Raumbedarf der Dämpfungsvorrichtung (4) zu reduzieren, ist erfindungsgemäss vorgesehen, den Bypasskanal als schraubenförmig um eine Mittelachse des Hauptkanals verlaufenden Spiralkanal (5) auszubilden.
Abstract:
An exhaust aftertreatment system may include an injector, an aftertreatment device and a mixer assembly. The injector may be configured to inject a fluid into an exhaust passageway that receives exhaust gas from a combustion engine. The aftertreatment device may be disposed in the exhaust passageway downstream of the injector. The mixer assembly may be disposed in the exhaust passageway upstream of the aftertreatment device and may include a first stage having a plurality of parallel plates and a second stage connected to the first stage and disposed downstream of the first stage. The second stage may include an auger blade. The mixer assembly may divide an exhaust stream into at least two flow paths.