A propeller system combines innovative strategies to create a new methodology to reduce propeller or rotor noise. The propeller is specifically aimed for ultra-quiet electrically powered aircraft foruse in high proximity aviation, but its low-noise advantages will extend to other purposes. The propeller blade includes geometries, along with size and operational limitations that minimize rotational and vortex noise, vibration and span-wise air flow on the blade. To further reduce noise, the propeller provides greater relative thrust on the inboard portions of the blade than do conventional propellers and provides less than conventional relative thrust including negative thrust at the outermost portions of the blade. The propeller blade includes stepped changes in shape at calculated intervals that can reduce resonant blade vibrations and their resultant noise. This ultra-quiet propeller design can also be used for quieting hovercraft, drones, surveillance aircraft, indoor fans, wind tunnels and other applications.
一种螺旋桨系统组合创新策略以创建一种降低螺旋桨或旋翼噪声的新方法。所述螺旋桨特别以用于在高接近度航空中使用的超静音电力供电飞机为目标,但它的低噪声优点将扩展到其他目的。螺旋桨叶片包括几何结构连同尺寸和操作限制,其最小化在叶片上的旋转和旋涡噪声、振动和沿翼展方向的气流。为了进一步降低噪声,所述螺旋桨在叶片的内侧部分上提供比常规螺旋桨提供的更大的相对推力,并在叶片的最外面的部分处提供比常规相对推力小的推力,包括负推力。所述螺旋桨叶片包括在所计算的间隔处的形状的步进式变化,其可减小共振叶片振动和它们产生的噪声。此超静音螺旋桨设计也可用于静音气垫船、无人机、侦察机、户内风扇、风洞和其他应用。
ULTRA-QUIET PROPELLER SYSTEM
超静音螺旋桨系统
2020-12-04
Patent
Electronic Resource
Chinese
IPC: | B64C AEROPLANES , Flugzeuge |