An inherent aerodynamic limitation of high-advance-ratio high-speed helicopters is reverse
flow on the retreating blades, which can be a source of several unsteady effects, like vortex …

View Video Presentation: https://doi. org/10.2514/6.2022-1537. vid An inherent aerodynamic
limitation of high advance ratio, high-speed helicopters is the reverse flow region on the …

Rotating blades on helicopters experience reverse flow under high advance ratio conditions.
Here, reverse flow is characterized by the flow traveling from the sharp trailing edge to the …

In forward flight, high advance ratio rotors encounter a large region of reverse flow on their
retreating side. The reverse flow region is the cause of significant separation in sharp-trailing …

The rotorcraft community has a growing interest in the development of high-speed
helicopters to replace outdated fleets. One barrier to the design of such helicopters is the …

One challenge that plagues the high-speed operation of rotorcraft is the inherent increase in
size of the reverse flow region on the retreating side of the rotor disk. The present work …

As rotor advance ratio rises, the region of reverse flow on the rotor disk expands, reaching
the blade tip at 270◦ azimuth at an advance ratio µ∼ 1 of 1. The behavior of the rotor blade …

The vortex shedding characteristics of three airfoils held at static angles of attack through
360 deg are presented with a focus on reverse flow (150≤ α≤ 180 deg). Wind tunnel …

Rotating blades at high advance ratios can experience reverse flow on the retreating side of
the rotor disc, where the freestream flow is directed from the sharp trailing edge of the blade …

The retreating blade of a high-advance-ratio rotor encounters a wide range of Reynolds
numbers when passing through the reverse flow region. The present work was aimed at …