Sound suppression system (original) (raw)
En astronautique, un déluge est un système permettant de déverser de l'eau au niveau de l'échappement d'un lanceur spatial au moment de son décollage, permettant d’atténuer les ondes acoustiques, et éviter tout rebond de l'onde de choc vers le lanceur, ce qui pourrait l'endommager. Au contact de la chaleur extrême générée par la combustion, les milliers de litres d'eau se transforment en vapeur, ce qui constitue le nuage de vapeur d'eau caractéristique des décollages.
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| dbo:abstract | Sites for launching large rockets are often equipped with a sound suppression system to absorb or deflect acoustic energy generated during a rocket launch. As engine exhaust gasses exceed the speed of sound, they collide with the ambient air and shockwaves are created, with noise levels approaching 200 db. This energy can be reflected by the launch platform and pad surfaces, and could potentially cause damage to the launch vehicle, payload, and crew. For instance, the maximum admissible overall sound power level (OASPL) for payload integrity is approximately 145 db. Sound is dissipated by huge volumes of water distributed across the launch pad and launch platform during liftoff. Although the primary reason for the water deluge is to reduce extreme heat damage to the launch structure, it also serves to suppress sound waves that can damage the vehicle upon launch. Water-based acoustic suppression systems are common on launch pads. They aid in reducing acoustic energy by injecting large quantities of water below the launch pad into the exhaust plume and in the area above the pad. Flame deflectors or flame trenches are designed to channel rocket exhaust away from the launch pad but also redirect acoustic energy away. (en) En astronautique, un déluge est un système permettant de déverser de l'eau au niveau de l'échappement d'un lanceur spatial au moment de son décollage, permettant d’atténuer les ondes acoustiques, et éviter tout rebond de l'onde de choc vers le lanceur, ce qui pourrait l'endommager. Au contact de la chaleur extrême générée par la combustion, les milliers de litres d'eau se transforment en vapeur, ce qui constitue le nuage de vapeur d'eau caractéristique des décollages. Un déluge peut être couplé à des carneaux. Tous les pas de tir ne possèdent pas de déluge, ceux des fusées Soyouz par exemple : la table de lancement est située au-dessus d'un vaste espace vide, ce qui empêche tout risque de rebond de l'onde de choc. (fr) |
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| rdfs:comment | En astronautique, un déluge est un système permettant de déverser de l'eau au niveau de l'échappement d'un lanceur spatial au moment de son décollage, permettant d’atténuer les ondes acoustiques, et éviter tout rebond de l'onde de choc vers le lanceur, ce qui pourrait l'endommager. Au contact de la chaleur extrême générée par la combustion, les milliers de litres d'eau se transforment en vapeur, ce qui constitue le nuage de vapeur d'eau caractéristique des décollages. (fr) Sites for launching large rockets are often equipped with a sound suppression system to absorb or deflect acoustic energy generated during a rocket launch. As engine exhaust gasses exceed the speed of sound, they collide with the ambient air and shockwaves are created, with noise levels approaching 200 db. This energy can be reflected by the launch platform and pad surfaces, and could potentially cause damage to the launch vehicle, payload, and crew. For instance, the maximum admissible overall sound power level (OASPL) for payload integrity is approximately 145 db. Sound is dissipated by huge volumes of water distributed across the launch pad and launch platform during liftoff. Although the primary reason for the water deluge is to reduce extreme heat damage to the launch structure, it al (en) |
| rdfs:label | Déluge (astronautique) (fr) Sound suppression system (en) |
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| foaf:depiction | wiki-commons:Special:FilePath/Sound_suppression_water_system_test_at_KSC_Launch_Pad_39A.jpg |
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