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Regarding little benefit: The second paragraph already discusses the lack of aerodynamic benefit, and the gyro effects are small compared to the damping and control forces available in regular …
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Aiming at the typical dual aeroengine with inter-shaft bearing, the dual-rotor dynamic analysis model was established. The dynamic characteristics induced by the high pressure …
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Multirotors are gaining great importance in the layout of innovative and more agile mobility. In this framework, a possible solution to developing an aircraft complying with the stringent size requirements characterizing this type …
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Wojno, J.P. and Janardan, B.A. Comparison of NASA 9 × 15 Low Speed Wind Tunnel Counter Rotating Open Rotor Data with GE-Anechoic Facility Historic Data for …
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The noise from conventional single multi-rotor UAV propellers is predominantly caused by steady loading and thickness noise in directions near the plane of the propeller …
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In recent years, with the development of CFD methods [[11], [12], [13]], many scholars have conducted extensive research on the aerodynamic performance of coaxial …
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Unlike conventional helicopters that possess a main rotor for lift and thrust with a tail rotor for anti-torque, a coaxial helicopter utilizes two counter-rotating rotor disks that serve to provide lift, …
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Contra-rotation increases efficiency in comparison with the single-rotor design, but this advantage is not fully harnessed. The axial spacing of two-stage contra-rotating blade …
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The DRWT system employs counter-rotating technology, allowing the downwind rotor to benefit from the swirl generated by the upwind rotor's interrupted flow 14,15.
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Counter-rotating propellers offer a practical solution to some of the challenges faced by propeller-driven aircraft. By spinning in opposite directions, they help cancel out torque and …
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With the renewed interest in counter-rotating coaxial rotor (CCR) vehicles, a comprehensive understanding of its performance under out-of-ground effect and in-ground …
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Counter-rotating open rotor are currently being investigated within the frame of aircraft fuel burn and noise reduction. The vortex sheet shed by the front propeller interacts with the …
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Compact design is an important development trend for the refrigerating system to help reduce the supplies and achieve the carbon neutrality, while this would unavoidably put forward higher …
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rotating machinery world – with a few important differences, especially once the rotor starts to spin. A Simple Rotating Machine The rotating machinery equivalent to the single spring-mass …
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As in the case of the contra-rotating propeller principle, recent work on this concept has been largely confined to research and development, and the system has rarely been used …
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The mutual influence between the counter-rotating rotors is the largest when the blades are in close proximity. Similar to the results for the unidirectional co-axial twin-rotor, a …
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There are two types of counter-rotating double rotors. The first is the tandem rotor used on the CH-47 Chinook. It has a larger disc area compared to a coaxial …
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Subsequently, using three-dimensional spectrum, rotating orbits, and Poincaré diagram, a comparison of inter-shaft rubbing behaviors of a twin-spool rotor system with and …
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This work utilizes the surface-vorticity solver FlightStream® to explore its efficacy in modeling the aerodynamic interaction of counter-rotating coaxial rotors during blade …
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An unbalanced rotor accelerates and decelerates during each revolution. The turbine experiences loss of power during half of the rotor rotation and gain of power during the …
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For co-rotating rotors, the swirled flow has the same direction as the blade rotation such that u 2, θ is subtracted from Ω η 2 when computing the relative velocity, and vice versa, …
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Contra-rotating propellers, also referred to as coaxial contra-rotating propellers or high-speed propellers, apply the maximum power of an engine (or engines) to drive two propellers one …
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Description Counter-rotating propellers are installed on some twin and multi-engine, fixed wing aircraft. They are called counter-rotating propellers because the propeller(s) on one wing …
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Counter-rotating coaxial rotors (CCR) are ubiquitous in emerging next-generation configurations, demonstrating enhanced performance metrics such as increased forward-flight …
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Inaddition,thefigureofmeritwasusedasametrictoidentifythepointofrotorstall. Thefigureofmeritisan ...
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Coaxial helicopters solve the problem of torque by using counter-rotating main rotors. On a real helicopter the tail orientation is controlled with pedals similar to those for a rudder on an …
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Prabith et al. [24] found that the counter-rotation rotor system enters the quasi-periodic regime more quickly than the co-rotation case when rub-impact occurs. However, to …
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For the counter-rotating rotors, interference happens for the aerodynamic noise emitted from different rotors. The variation of the relative location of the sound sources will …
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Counter-Rotating Propeller Modeling The first challenge encountered when creating a cycle model for an open rotor engine was developing a performance prediction modeling capability for the …
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