초록 ▼

An acoustic treatment device for an internal primary ejection duct from a turbojet pod, including an upstream zone and a downstream zone relative to an airflow direction in the primary ejection duct, the upstream and downstream zones being located on each side of a separating wall with a first face

An acoustic treatment device for an internal primary ejection duct from a turbojet pod, including an upstream zone and a downstream zone relative to an airflow direction in the primary ejection duct, the upstream and downstream zones being located on each side of a separating wall with a first face on the side of the upstream side and a second face on the side of the downstream side. The separating wall is a micro-porous wall and the face of the separating wall located on the side of the downstream side is covered by a honeycomb structure to attenuate high frequency acoustic waves. Such a device may find application to treatment of combustion and turbine noises.

대표청구항 ▼

The invention claimed is: 1. An acoustic treatment device for an internal structure of a primary ejection duct from a turbojet pad, comprising:an upstream zone and a downstream zone relative to an airflow direction in the primary ejection duct, the upstream zone including a perforated outside wall t

The invention claimed is: 1. An acoustic treatment device for an internal structure of a primary ejection duct from a turbojet pad, comprising:an upstream zone and a downstream zone relative to an airflow direction in the primary ejection duct, the upstream zone including a perforated outside wall to allow acoustic waves to enter and the downstream zone including a solid outside wall, the upstream and downstream zones being located on each side of a separating wall with a first face on the side of the upstream zone and a second face on the side of the downstream zone,wherein the separating wall has a perforation ratio of fifteen percent or less, and a micro-porosity of the separating wall and a honeycomb structure attenuate high frequency acoustic waves that cover the face of the separating wall in the downstream zone.