F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
F01N1/00—Silencing apparatus characterised by method of silencing
F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
Systeme pour attenuer les ondes sonores contenues dans les gaz ou l'air d'evacuation des moteurs thermiques ou turbines ou materiels fonctionnant a l'air comprime