what is the impact of counter rotating the rotor

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what is the impact of counter rotating the rotor

what is the impact of counter rotating the rotor

Effect of counter-rotating fan’s speed matching on

A counter-rotating fan consists of two counter-rotated rotors, driven by two electro motors, which eliminates the requirement of guide vanes. It has been widely used in industry, transportation and other fields due to its advantages such as large load, lightweight, compact structure, etc.

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Aerodynamic and Aeroacoustic Analysis of Counter

Counter-rotating open rotors (CRORs) have the potential to reduce environmental emissions thanks to their high propulsive efficiency. However, there are a number of concerns surrounding their

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System-Modelling Approach for Counter-Rotating Open

Counter-Rotating Open Rotor (CROR), an unducted configuration which operates at a practically infinite bypass ratio, was reintroduced through project DREAM and Clean Sky initiative as one of the most promising alternatives in terms of improved propulsive efficiency and fuel consumption. Following a dramatic oil price increase, CROR had been developed and extensively tested throughout the 1980’s,

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Performance of a Mach-Scale Coaxial Counter-Rotating

2017-7-24  A single two-bladed rotor, a single four-bladed rotor, and a coaxial counter-rotating rotor system with two blades in each rotor were tested. Parameters for all three tested configurations are listed in Table 1. An untwisted, untapered, constant section blade geometry waschosen bothfor ease offabrication andto serve asa simple case

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Noise reduction of a Counter Rotating Open Rotor

Counter Rotating Open Rotors (CROR) have the potential to significantly reduce aircraft emissions. However, there are a number of concerns surrounding their noise levels. In this contribution, we propose a number of novel configurations to reduce the noise of CROR for general aviation aircraft.

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What are the advantages of dual counter-rotating

2021-6-9  Counter rotating shafts, one in the other. One rotor quite high over the other one to allow relative flapping. Super complicated control actuation. Power requirements: the coaxial configuration has power requirements according to this answer. All in all, the counter rotating setup is simpler than the coaxial setup, which does have the advantage of a very small footprint.

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Rotor Interaction Noise in Counter-Rotating Propfan

A frequency domain approach based on Goldstein’s formulation of the acoustic analogy for moving media and Hanson’s single rotor noise method was extended to counter-rotating configurations. The far field noise predictions were compared to measured data of a similar CRP configuration and demonstrated good agreement between the computed and

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The stability analysis of a two-spool rotor system

2021-3-30  It indicates that for the same set of system parameters, the counter-rotating system undergoes early rub-impact. This is due to the lower critical speeds of the counter-rotating system compared to the co-rotating system.

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Aerodynamic Design of an Aspirated Counter-Rotating

2019-4-9  aspiration in conjunction with rotor counter-rotation. Aspiration has been shown to make feasible significantly increased blade loading and counter-rotation provides a means of taking full advantage of this potential throughout a multistage compressor.

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Prediction of aeroacoustic performance of counter

2019-12-14  Ozbay et al. studied experimentally the wake specification as well as performance of dual-rotor wind turbines in two different positioning, counter-rotating (CR) and co-rotating (CO), with a fixed distance of 0.25 diameter between front and rear rotors, and compared the performance of these models with single-rotor wind turbine (SRWT). The specification of flow around the wind turbines was

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Influence of Torque Ratio on Counter-Rotating Open

2015-4-8  This paper investigates the influence of the torque ratio, at constant total thrust, on the interaction noise of a generic counter-rotating open rotor in pusher configuration. It is shown that torque ratio has a small influence on the open-rotor aerodynamic performance but a strong impact on interaction noise at takeoff condition.

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System-Modelling Approach for Counter-Rotating Open

Counter-Rotating Open Rotor (CROR), an unducted configuration which operates at a practically infinite bypass Ref.8, where an acoustic impact of different rotor-related parameters is studied. Interaction with the wake from the pylon is important for the noise generated by the front rotor, and it shows to be more pronounced at approach.

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The Application of Counter-Rotating Turbine in

The counter rotating turbine is an axial turbine with a first stator followed by a first rotor, an optional second stator, and a second rotor, which rotates in opposite direction of the first stage. In 1958, Wintucky [ 2 ] presented the basic analysis of counter rotating turbine with restricted hypothesis like the same mean diameters for each

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Performance of a Mach-Scale Coaxial Counter-Rotating

2017-7-24  Performance of a Mach-Scale Coaxial Counter-Rotating Rotor in Hover Christopher G. Cameron,∗ Anand Karpatne,∗ and Jayant Sirohi† University of Texas at Austin, Austin, Texas 78712 DOI: 10.2514/1.C033442 A Mach-scale rotor system, 2.03 m in diameter, was built and hover tested in three configurations: two-bladed

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ROTOR SIZE OPTIMISATION OF A COUNTER

Absztrakt The customers growing demand for energy utilization and the need for green and sustainable energy have changed our energy security. Changes in the energy mix have become necessary by the developments and improvements of the energy producers and the need by the population for an energyefficient and sustainable future, thus today’s expectation in this engineering field is to design

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INVESTIGATION OF THE TIP CLEARANCE EFFECT IN A

2019-7-6  characteristics of the counter-rotating ducted fan to investigate the effect of tip clearance. The tip clearance(t/R) of rear rotor is fixed to 0.67, 1.33, 2.67, 4.00, 5.33% and vise versa. The tip clearance(t/R) of front rotor is set to 0.67~5.33%. The Figure of merit and thrust coefficient increases along with increase of the

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Conceptual Design of a Counter- Rotating Fan System for

2020-8-6  rotor into a pair of counter-rotating fans (CRFs) are adopted in the present design. The design optimization of CRFs are carried out based on turbomachinery CFD analysis7,8 and a multi-objective evolutionary algorithm.9 The present paper consists of 5 chapters hereafter. Chapter 2

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Experimental comparison between a counter-rotating

2021-6-23  a conventional single rotor stage (R1) and a conventional rotor-stator stage (RSS). To achieve this target, a first series of experiments are carried out on a sing le axial-flow fan (R1). Then a stator is designed to fit with this rotor to form RSS and finally, the seco nd counter-rotating rotor is used to form the counter-rotating stage (CRS).

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Effect of Rotor Spacing and Duct Diffusion Angle on the

2020-10-23  a counter-rotating fan with and without ducts for di erent blade pitch angles, rotor spacings, and tip clearances in hover mode. The results showed that the counter-rotating fan with a duct generated more thrust than the open counter-rotating fan because of the negative pressure region around the duct’s leading edge created by the duct.

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CFD Computation of the H-Darrieus Wind Turbine—The

2019-6-28  the analysis of the impact of the tower shadow on the performance characteristics of the 17-m rotor (the ratio of the rotor blade and radius chord, c/R, was 0.05). According to the predictions of the 2D version of this model, the rotor power coe cient drops almost linearly with

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Influence of Torque Ratio on Counter-Rotating Open

2015-4-8  This paper investigates the influence of the torque ratio, at constant total thrust, on the interaction noise of a generic counter-rotating open rotor in pusher configuration. It is shown that torque ratio has a small influence on the open-rotor aerodynamic performance but a strong impact on interaction noise at takeoff condition.

get price

The Application of Counter-Rotating Turbine in

The counter rotating turbine is an axial turbine with a first stator followed by a first rotor, an optional second stator, and a second rotor, which rotates in opposite direction of the first stage. In 1958, Wintucky [ 2 ] presented the basic analysis of counter rotating turbine with restricted hypothesis like the same mean diameters for each

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Study of Contra-rotating Coaxial Rotors in Hover, A

2020-10-13  counter-rotating coaxial rotor system. As it is based on the blade element theory, it could be used as a design tool where the engineer can modify all parameters rotor radius, blade pitch distribution, tip velocity, rotor spacing, number of blades, blade chord, and airfoil's shape through its lift coefficient versus angle of attack slope.

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Co-rotating and Counter-rotating Coaxial Rotor

Generally, a counter-rotating coaxial rotor is more efficient than the corresponding single rotor with twice the number of blades. Some of the performance gains are attributed to the unequal thrust sharing between the two rotors with the upper rotor, which operates more efficiently without direct interference of the lower rotor wake, carrying a

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Conceptual Design of a Counter- Rotating Fan System for

2020-8-6  rotor into a pair of counter-rotating fans (CRFs) are adopted in the present design. The design optimization of CRFs are carried out based on turbomachinery CFD analysis7,8 and a multi-objective evolutionary algorithm.9 The present paper consists of 5 chapters hereafter. Chapter 2

get price

ROTOR SIZE OPTIMISATION OF A COUNTER

Absztrakt The customers growing demand for energy utilization and the need for green and sustainable energy have changed our energy security. Changes in the energy mix have become necessary by the developments and improvements of the energy producers and the need by the population for an energyefficient and sustainable future, thus today’s expectation in this engineering field is to design

get price

Experimental comparison between a counter-rotating

2021-6-23  a conventional single rotor stage (R1) and a conventional rotor-stator stage (RSS). To achieve this target, a first series of experiments are carried out on a sing le axial-flow fan (R1). Then a stator is designed to fit with this rotor to form RSS and finally, the seco nd counter-rotating rotor is used to form the counter-rotating stage (CRS).

get price

Flow-driven simulation on variation diameter of counter

2019-5-12  2.2 Counter rotating wind turbines Lee et al [5], a counter rotating wind turbines (CRWT) is the development of a dual rotor horizontal axle wind turbine, having two rotors rotating in opposite direction on the same axis. The Counter rotating wind turbine model design used in the research can be seen from Table 1.

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Twisting of the Tail Rotor Shaft A Case Study

rotation of overhead rotor blades produces a clockwise torque which is being countered by the tail rotor blades to keep the helicopter stable and straight. In addition, the rotor blades are used to change the direction of the helicopter by changing the pitch (angle of attack) of the blades. Fig. 1 . Counter torque by the tail rotor shaft [1]

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CFD Computation of the H-Darrieus Wind Turbine—The

2019-6-28  the analysis of the impact of the tower shadow on the performance characteristics of the 17-m rotor (the ratio of the rotor blade and radius chord, c/R, was 0.05). According to the predictions of the 2D version of this model, the rotor power coe cient drops almost linearly with

get price