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Journal articles on the topic 'Rotor characteristics'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Kosushkin, K. G., B. S. Kritsky, and R. M. Mirgazov. "Computational studies of the rotors aerodynamic characteristics of multirotor drones." Civil Aviation High Technologies 24, no. 5 (2021): 60–75. http://dx.doi.org/10.26467/2079-0619-2021-24-5-60-75.

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The article presents the results of computational studies of aerodynamic characteristics for unmanned lift-generating multi-rotor drones of various configurations. The distinctive features of rotors flow were characterized. The rotor interaction was evaluated. The computations were based on the nonlinear rotor blade vortex theory in a non-stationary arrangement. The combinations of four, eight (four coaxial) and fourteen two-bladed rotors at velocity V = 100, 150, 200 km/h were considered. Semi-empirical methods were employed to select the rotor angles of attack, rotation speed, blade installa

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2

Doerffer, Krzysztof, Janusz Telega, Piotr Doerffer, Paulina Hercel, and Andrzej Tomporowski. "Dependence of Power Characteristics on Savonius Rotor Segmentation." Energies 14, no. 10 (2021): 2912. http://dx.doi.org/10.3390/en14102912.

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Savonius rotors are large and heavy because they use drag force for propulsion. This leads to a larger investment in comparison to horizontal axis wind turbine (HAWT) rotors using lift forces. A simple construction of the Savonius rotor is preferred to reduce the production effort. Therefore, it is proposed here to use single-segment rotors of high elongation. Nevertheless, this rotor type must be compared with a multi-segment rotor to prove that the simplification does not deteriorate the effectiveness. The number of segments affects the aerodynamic performance of the rotor, however, the resu

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3

Povarov, Sergii. "Determination of the aerodynamic characteristics of the tiltrotor with the wingtip-mounted coaxial rotors." MECHANICS OF GYROSCOPIC SYSTEMS, no. 40 (December 26, 2021): 108–16. http://dx.doi.org/10.20535/0203-3771402020248778.

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The article describes the study of rotor-to-wing aerodynamic interaction for the wingtip-mounted coaxial rotors configuration of the tiltrotor aircraft. The influence of the rotor slipstreams on lift-to-drag ratio characteristic was determined. Obtained results were compared with similar characteristics of the equivalent in thrust conventional single rotor slipstreams impact. Using the computational aerodynamics methods (panel-vortex method) the flow around the tiltrotor model with the wingtip-mounted single and coaxial rotors has been simulated. A study of the basic model configur

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Povarov, Sergey. "Comparison of aerodynamic characteristics of convertible models with single and coaxial schemes of propellers." MECHANICS OF GYROSCOPIC SYSTEMS, no. 39 (May 20, 2020): 96–105. http://dx.doi.org/10.20535/0203-3771392020229110.

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The article describes the study of rotor-to-wing aerodynamic interaction for the wingtip-mounted coaxial rotors configuration of the tiltrotor aircraft. The influence of the rotor slipstreams on lift-to-drag ratio characteristic was determined. Obtained results were compared with similar characteristics of the equivalent in thrust conventional single rotor slipstreams impact. Using the computational aerodynamics methods (panel-vortex method) the flow around the tiltrotor model with the wingtip-mounted single and coaxial rotors has been simulated. A study of the basic model configur

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5

Freakley, Philip K. "Distributive Mixing Characteristics of Batch Internal Mixers." Rubber Chemistry and Technology 65, no. 4 (1992): 706–14. http://dx.doi.org/10.5254/1.3538636.

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Abstract The distributive mixing characteristics of three internal mixers are examined: a Parrel BR Banbury (1.6 L), a Farrel F40 Banbury (40 L), and a Francis Shaw K1 Intermix (5.5 L). The former two machines have two-wing tangential rotors while the latter has intermeshing rotors. The distribution of sulfur in mixed batches of an EPDM compound and an SBR compound, as measured by curemeter tests on samples taken from random locations within each batch, is used to quantify distributive mixing. The dominant influence on sulfur distribution is total rotor revolutions and a maximum of 20 rotor re

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Arcoumanis, C., R. F. Martinez-Botas, J. M. Nouri, and C. C. Su. "Performance and Exit Flow Characteristics of Mixed-Flow Turbines." International Journal of Rotating Machinery 3, no. 4 (1997): 277–93. http://dx.doi.org/10.1155/s1023621x97000262.

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The performance and exit flow characteristics of two mixed-flow turbines have been investigated under steady-state conditions. The two rotors differ mainly in their inlet angle geometry, one has a nominal constant incidence (rotor B) and the other has a constant blade angle (rotor C), but also in the number of blades. The results showed that the overall peak efficiency of rotor C is higher than that of rotor B. Two different volutes were also used for the tests, differing in their cross-sectional area, which confirm that the new larger area volute turbine has a higher efficiency than the old o

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7

Gregorio, Fabrizio De, Karl-Stephane Rossignol, Giuseppe Ceglia, and Jianping Yin. "Aerodynamic and acoustic investigations of rotor-rotor wake interaction." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 21 (July 8, 2024): 1–27. http://dx.doi.org/10.55037/lxlaser.21st.221.

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The paper presents part of the experimental activities carried out in the GARTEUR Action Group RC/AG-26 to study the acoustic and aerodynamic characteristics of small rotor configurations, including the influence of the rotor-rotor interactions. Two rotors, equipped with two-bladed propellers of a diameter of D=330.2 mm, were operated at two rotating speeds of 8025 RPM and 10120 RPM and arranged in different configurations. Isolated rotor and two different coaxial configurations in hover conditions were assessed. The aerodynamic loads and the rotor slipstream characterisation, in terms of flow

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8

Wang, Yu, Mao Sun, and Chao Yan. "Numerical simulation of hovering flow field and interference characteristics of rotor system." Journal of Physics: Conference Series 2235, no. 1 (2022): 012002. http://dx.doi.org/10.1088/1742-6596/2235/1/012002.

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Abstract In order to investigate the aerodynamic interference characteristics of tandem rotor, this paper simulates the hovering flow field of single rotor and tandem rotor based on the dynamic structure overset grid method and unsteady Navier-Stokes equations in computational fluid dynamics (CFD). In the study of hover state of single rotor with twist, the trajectory of the blade vortex and the change pattern are briefly analyzed. Subsequently, the flow field disturbance of tandem rotor, the vortex structure, the pull coefficient and the downwash flow are investigated. The results show that t

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9

Sineglazov, Victor, and Oleksandr Stanislavchuk. "Automation Disign of Hybrid Vertical-axial Rotors." Electronics and Control Systems 4, no. 70 (2022): 44–50. http://dx.doi.org/10.18372/1990-5548.70.16755.

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The paper proves the need to create vertical-axial rotors of wind power plants in the city strip, which can be placed on roofs, which makes it possible to increase their energy efficiency by 60-70%. It is shown that the placement of such rotors on the roofs has its own characteristics, which is the need to take into account the relief of the roof of the house, its surface area, rose and wind speed over it and others. Examples of wind farms are considered and it is proved that their energy efficiency can be increased by using hybrid vertical-axial rotors, which consist of a combination of Darri

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10

Qi, Haotian, Ping Wang, Linsong Jiang, and Yang Zhang. "Investigation on Aerodynamic Noise Characteristics of Coaxial Rotor in Hover." Applied Sciences 12, no. 6 (2022): 2813. http://dx.doi.org/10.3390/app12062813.

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A numerical method based on Reynolds Averaged Navier–Stokes (RANS) equations and a high-efficiency trim model is developed to simulate the aerodynamics of a coaxial rotor. Farassat 1A equations are used for the prediction of thickness and loading noise. Hover cases of different thrust coefficients with torque balance are conducted. The sound pressure history of different observation points positioned below the rotor disk plane is analyzed. Results indicate that the special noise characteristics of the coaxial rotor are mainly caused by the noise superposition of the twin rotors and the unstead

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11

Xia, Peng, Zhan-sheng Liu, Jia-jia Yan, and Guang-hui Zhang. "Lock-up characteristics of floating ring seals considering rotor whirling motion." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, no. 4 (2017): 437–52. http://dx.doi.org/10.1177/1350650117718657.

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This paper presents a lock-up condition with rotor whirling motion to predict the lock-up area for floating ring seals in liquid turbopumps. To calculate the hydrodynamic forces with arbitrary rotor motion, bulk flow model is modified with explicitly considering the squeeze velocity and temporal inertia. Finite element method is implemented to solve the transient nonlinear model. The effect of lock-up position on leakage and rotordynamic coefficients of floating ring seals is studied and shows insensitivity to eccentricity within moderate eccentric area (<0.5), which indicates that predicti

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12

YUAN, Mingchuan, Huixun SUN, Zhibin LI, Qingfeng NIU, and Feng FAN. "Numerical calculation and analysis of aero-acoustic characteristics of tilt rotor in different tilt angles." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 42, no. 2 (2024): 205–13. http://dx.doi.org/10.1051/jnwpu/20244220205.

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The numerical calculation model for the aero-acoustic analysis of a tilt rotor was established by combining the free wake method and the FW-H (Ffowcs Williams-Hawkings) equation. The numerical method was validated by using the tilt rotor′s aero-acoustic test results. The aero-acoustic characteristics of dual tilt rotors that take into account the force and moment trim of an aircraft in its typical transition path were calculated. The unsteady air load of a rotor blade and its noise data in different observational positions were acquired. The acoustic directivity and sound pressure level of the

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13

ROTARU, Constantin, Janel TANASE, Oliver CIUICA, and Eduard MIHAI. "COAXIAL ROTOR SYSTEMS – CHARACTERISTICS AND PERFORMANCES." SCIENTIFIC RESEARCH AND EDUCATION IN THE AIR FORCE 20 (June 18, 2018): 233–38. http://dx.doi.org/10.19062/2247-3173.2018.20.31.

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14

He, Xing Zhu, Shu Nan Liu, Yan Li Chen, Chun Xue Wang, and Song Yang. "Research on Hover Characteristics of Ducted Fan with Coaxial Rotors." Applied Mechanics and Materials 427-429 (September 2013): 216–20. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.216.

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The method of handling respectively is used to refine the grid of ducted fan with coaxial rotors. Research the complex flow field of the ducted fan by numerical simulation to analyze its hover characteristics. The curve of the upper rotors lift, the lower rotors lift, the ducts lift with collective and the distance between rotors is got respectively. By comparing with the aerodynamic characteristics of ducted fan with a single rotor, results show that there is interference between the upper and lower rotors, the upper one interferes the lower one more heavily and interference is reduced with t

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15

Petro, Kachanov, Lytviak Oleksandr, Derevyanko Oleksandr, and Komar Sergii. "DEVELOPMENT OF AN AUTOMATED HYDRAULIC BRAKE CONTROL SYSTEM FOR TESTING AIRCRAFT TURBOSHAFT GAS TURBINE ENGINES." Eastern-European Journal of Enterprise Technologies 6, no. 2 (102) (2019): 52–57. https://doi.org/10.15587/1729-4061.2019.185539.

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To absorb the power generated by a free turbine, hydraulic brake systems of various designs are used in ground tests of aircraft turboshaft gas turbine engines. Ground tests of aircraft turboshaft gas turbine engines with the use of such hydraulic brakes can result in emergency modes of automated engine control in the area of operation of a free turbine speed regulator. Mismatch between the hydraulic brake loading characteristics and the loading characteristics of the rotor driven by a free turbine of the engine is the main cause of emergency operation of automated control systems. The present

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16

Li, Hui, Changzhi Shi, Xuejun Li, Mingfeng Li, and Jie Bian. "Research on Unbalanced Vibration Characteristics and Assembly Phase Angle Probability Distribution of Dual-Rotor System." Machines 12, no. 12 (2024): 842. http://dx.doi.org/10.3390/machines12120842.

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This paper addresses the complex issue of vibration response characteristics resulting from the unbalanced assembly of the double rotors in the 31F aero-engine. The study investigates the vibration response behavior of the dual-rotor system through the adjustment of rotor assembly phase angle. Initially, a dynamic model of the four-disk, five-pivot dual-rotor system is established, with its natural frequencies and vibration modes verified. The influence of size and the position of the unbalance on the vibration amplitude in the dual-rotor system is analyzed. Additionally, the probability distr

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17

Fan, Ye Sen, San Min Wang, and Zhen Yang. "Dynamic Characteristics of the Coupled System of the High Pressure Rotor and the Radial Driveshaft of a Turbofan Engine." Advanced Materials Research 44-46 (June 2008): 127–34. http://dx.doi.org/10.4028/www.scientific.net/amr.44-46.127.

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In a turbofan engine, the high pressure rotor and the radial driveshaft, which transmit the power from the internal gear-box to the external gear-box, are geared by a spiral bevel gear pair. In this paper, a reasonably simplified dynamic model of the coupled rotors system is established, and then, the coupled stiffness matrix and coupled damping matrix of the spiral bevel gear pair are deduced. A shaft element method is proposed to investigate the lateral-torsional coupled vibration equations of the gear-rotor system. Furthermore, the mode shapes and unbalance responses of this two rotors coup

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18

Wang, Longkai, Yijun Yin, Ailun Wang, Xing Heng, and Miao Jin. "Dynamic Modeling and Vibration Characteristics for a High-Speed Aero-Engine Rotor with Blade Off." Applied Sciences 11, no. 20 (2021): 9674. http://dx.doi.org/10.3390/app11209674.

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Blade off that occurs during operation will generate a sudden imbalance excitation and make the rotor become inertially asymmetric, which leads to large instantaneous impact load and induces more complex rotor dynamic phenomena. In order to study the transient dynamic characteristics for complex rotors suffering from blade off, a mathematical model for solving the response of the gas generator rotor in the aero-turboshaft engine is established based on the FE method and DOF condensation, in which the complex structural characteristics, transient impact load, and inertia asymmetry of the rotor

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19

Li, Yan, Yan Ouyang, Huisong Wu, Xiping Kou, and Su Jia. "Research for nonlinear vibration characteristics of sealing structure rub-impact between dual-rotor shafts." Journal of Physics: Conference Series 2977, no. 1 (2025): 012053. https://doi.org/10.1088/1742-6596/2977/1/012053.

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Abstract In order to study the influence of sealing structure rub-impact between dual-rotor shafts on nonlinear vibration, a dynamic model of an aero-engine dual-rotor system with sealing structure rub-impact between dual-rotor shafts in consideration was established. The nonlinear vibration phenomenon caused by the rubbing of the sealing structure between dual-rotor shafts was investigated through simulation and experimentation. The result shows that the backward whirling natural frequency of the dual-rotor system will be induced by the sealing structure rub-impact between dual-rotor shafts,

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20

Song, Ke, Huiting Huan, and Yuchi Kang. "Aerodynamic Performance and Wake Characteristics Analysis of Archimedes Spiral Wind Turbine Rotors with Different Blade Angle." Energies 16, no. 1 (2022): 385. http://dx.doi.org/10.3390/en16010385.

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Continuous improvement of wind turbines represent an effective way of achieving green energy and reducing dependence on fossil fuel. Conventional lift-type horizontal axis wind turbines, which are widely used, are designed to run under high wind speed to obtain a high efficiency. Aiming to use the low-speed wind in urban areas, a novel turbine, which is called the Archimedes Spiral Wind Turbine (abbreviated as ASWT), was recently proposed for low-speed wind applications. In the current work, a numerical simulation on the five ASWT rotors with different blade angles was carried out, which were

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21

Zheng, Nan, Mo-li Chen, Gui-Huo Luo, and Zhi-Feng Ye. "Dynamic Behavior Analysis of Intermediate Bearing-Squeeze Film Dampers-Rotor System under Constant Maneuvering Overload." Shock and Vibration 2021 (April 30, 2021): 1–24. http://dx.doi.org/10.1155/2021/5512409.

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Under the flight maneuvering of an aircraft, the maneuvering load on the rotor is generated, which may induce the change of dynamic behavior of aeroengine rotor system. To study the influence on the rotor dynamic behavior of constant maneuvering overload, a nonlinear dynamic model of bearing-rotor system under arbitrary maneuver flight conditions is presented by finite element method. The numerical integral method is used to investigate the dynamic characteristics of the rotor model under constant maneuvering overload, and the simulation results are verified by experimental works. Based on thi

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22

Wang, Nanfei, Dongxiang Jiang, and Hongzhi Xu. "Dynamic characteristics analysis of a dual-rotor system with inter-shaft bearing." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 3 (2017): 1147–58. http://dx.doi.org/10.1177/0954410017748969.

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The dual-rotor structure is susceptible to vibration, causing the malfunction of the entire operating system. In order to avoid the resonance during operation, it is significant and necessary to conduct modal analysis of such rotors. The dynamic analysis of the full dual-rotor system under operating conditions is also necessary to study dynamic characteristics of the rotating system. In this paper, one-dimension Timoshenko beam-type model, including the effects of gyroscopic moments, rotary inertias, bending and shear deformations, and three-dimension model for dual-rotor system with inter-sha

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23

Yang, Yucheng, Guohua Xu, Yongjie Shi, and Zhiyuan Hu. "Analysis of the Aeroacoustic Characteristics of a Rigid Coaxial Rotor in Forward Flight Based on the CFD/VVPM Hybrid Method." Aerospace 11, no. 1 (2023): 21. http://dx.doi.org/10.3390/aerospace11010021.

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This study develops a hybrid solver with reversed overset assembly technology (ROAT), a viscous vortex particle method (VVPM), and a CFD program based on the URNS method, in order to study the aerodynamic and acoustic characteristics of coaxial rigid rotors. The aerodynamic load of the “AH-1G” helicopter rotor is first calculated based on the hybrid method and compared with available experimental data. The prediction of the linear noise of the OLS rotor is then performed and the obtained results are compared with available experimental data. These results allow the evaluation of the accuracy o

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24

He, Pan, and Jian Xia. "Study on the Influence of Low-Level Jet on the Aerodynamic Characteristics of Horizontal Axis Wind Turbine Rotor Based on the Aerodynamics–Controller Interaction Method." Energies 15, no. 8 (2022): 2709. http://dx.doi.org/10.3390/en15082709.

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Accurate prediction of the aerodynamic characteristics of wind rotors subjected to various wind profiles is of considerable importance in the aerodynamics and structural design of wind turbines. As a very complex atmospheric phenomenon, the impact of a low-level jet (LLJ) on the aerodynamic characteristics of wind rotors is becoming more and more significant with the increase in wind turbine height. Additionally, during calculating the aerodynamic characteristics of the wind rotor, the known wind speed, rotor speed, and blade-pitch angle are generally required. However, when the wind profile i

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Liu, Zhen, Chen Bu, Xiangxu Kong, Dong Yang, and Bingfei Li. "Computational investigation of noise interaction for a nano counter-rotating rotor in a static condition." International Journal of Computational Materials Science and Engineering 07, no. 01n02 (2018): 1850004. http://dx.doi.org/10.1142/s2047684118500045.

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The interaction between the upper and lower rotors greatly influences the aeroacoustic characteristics of a counter-rotating nano-coaxial rotor. To study this influence, a numerical investigation was carried out. The unsteady flow field of a single upper rotor was first studied with a large-eddy simulation computational fluid dynamics method coupled with a sliding-mesh technique. The Ffowcs Williams–Hawking equation method was used to investigate the aeroacoustic characteristics of the upper rotor based on the flow field. An experimental setup was established to validate the computational appr

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26

Muszynska, A. "Improvements in Lightly Loaded Rotor/Bearing and Rotor/Seal Models." Journal of Vibration and Acoustics 110, no. 2 (1988): 129–36. http://dx.doi.org/10.1115/1.3269489.

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A model for lightly loaded steadily rotating shaft/bearing/seal systems is proposed in this paper. The model is based on modal characteristics for the rotor, and rotational characteristics for the fluid dynamic forces generated in bearings and/or seals. The fluid average circumferential velocity ratio as a nonlinear function of shaft eccentricity represents a key factor in the model. The model is extremely useful for rotor stability analysis. The model adequacy was proved for one and two lateral mode models of rotors.

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27

Shen, ZhiHuang, Bin Yao, BinQiang Chen, Wei Feng, and XiangLei Zhang. "A Novel Rotor Profile Error Tracing and Compensation Strategy for High Precision Machining of Screw Rotor Based on Trial Cutting of Limited Samples." Shock and Vibration 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/978325.

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The machining precision plays an important role in the operation reliability and service life of screw rotors. However, the actual machined rotor profile of screw rotors is different from its theoretical profile due to the errors of the machine tool. This paper proposes a novel method of error tracing and compensation to reduce the machined errors of rotor profile on the basis of the limited sample trials, and the method is based on a matrix of error compensation. The errors of rotor profile are obtained based on limited sample trials machining of screw rotors,and fitted into piecewise smooth

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28

Ullah, Wasiq, Faisal Khan, Udochukwu B. Akuru, and Mehroz Fatima. "Locked Rotor Fault Analysis in Dual Rotor Wound Field Flux Switching Generator for Counter-Rotating Wind Turbine Application." Machines 13, no. 6 (2025): 462. https://doi.org/10.3390/machines13060462.

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In this paper, the performance of the Independent Dual Rotor Wound Field Flux Switching Generator (IDRWFFSG) under locked rotor fault scenarios and counter-rotating operational direction for fault withstand capability is investigated. The IDRWFFSG and the locked rotor fault scenarios are defined, and the magnetic path formation is explained. An integrated mathematical and electromagnetic modelling of the generator characteristics performance comprising torque quality, output power, efficiency and power factor are undertaken, based on the finite element method (FEM) under fault conditions. The

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29

Shevchenko, S. S. "Mathematical modeling of centrifugal machines rotors seals for the purpose of assessing their influence on dynamic characteristics." Mathematical Modeling and Computing 8, no. 3 (2021): 422–31. http://dx.doi.org/10.23939/mmc2021.03.422.

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With an increase of equipment parameters, such as the pressure of the sealing medium and the speed of shaft rotation, the problems ensuring its hermetization efficiency are rising up. In addition to hermetization itself, the sealing system affect the overall operational safety of the equipment, especially vibratory. Groove seals are considered as hydrostatodynamic supports capable of effectively damping rotor oscillations. To determine the dynamic characteristics, models of grooved seals and single-disc rotors with grooved seals are examined. The obtained analytical dependences for computation

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Zeng, Xian Kui, Shuai An, De Wei Zhang, and Dong Wang. "Experimental Study of Relations between Synchronous Rotor Speed and Mixing Process." Key Engineering Materials 501 (January 2012): 243–46. http://dx.doi.org/10.4028/www.scientific.net/kem.501.243.

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Rotor speed is one of the most important technical characteristics of the internal mixer. The effects of rotor speed on mixing process have been studied. In the experiments, three types of synchronous rotors which were two-wing synchronous rotor, four-wing synchronous rotor and six-wing synchronous rotor were used. The experimental results indicated that there was a proper speed of different rotor structure for mixing process. And along with the increase of rotor speed, the maximum power, the unit consumption of energy and discharging temperature increase, while the physical and mechanical pro

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HE, Yayin, Wei ZHANG, Xuyang HE, Kai WANG, Junli WANG, and Yongqiang ZHAO. "Vibration Characteristics Analysis of Twin-Screw Compressor Shell Based on the Fluid-Solid Coupling Method." Mechanics 30, no. 2 (2024): 168–76. http://dx.doi.org/10.5755/j02.mech.33175.

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Under the action of the flow field force and the constraint reaction force of the negative rotor and the positive rotor, the twin screw compressor shell will produce vibration, which will affect the life of the parts and produce noise. The rotors restraint reaction force are calculated by fluid-structure coupling method. The shell inherent frequency is solved by modal analysis, and the shell resonance is analyzed during the rotors meshing process. On this basis, the flow field force and rotor constraint reaction force are used as the compressor shell vibration excitation sources, and the vibra

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32

Sahim, Kaprawi, Kadafi Ihtisan, Dyos Santoso, and Riman Sipahutar. "Experimental Study of Darrieus-Savonius Water Turbine with Deflector: Effect of Deflector on the Performance." International Journal of Rotating Machinery 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/203108.

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The reverse force on the returning blade of a water turbine can be reduced by setting a deflector on the returning blade side of a rotor. The deflector configuration can also concentrate the flow which passes through the rotor so that the torque and the power of turbine can be considerably increased. The placing of Savonius in Darrieus rotor is carried out by setting the Savonius bucket in Darrieus rotor at the same axis. The combination of these rotors is also called a Darrieus-Savonius turbine. This rotor can improve torque of turbine. Experiments are conducted in an irrigation canal to find

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De Gregorio, F., P. Candeloro, G. Ceglia, and T. Pagliaroli. "Flow field and acoustic assessment of twin rotors in hover conditions." Journal of Physics: Conference Series 2802, no. 1 (2024): 012011. http://dx.doi.org/10.1088/1742-6596/2802/1/012011.

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Abstract The paper presents part of the experimental activities in the GARTEUR Action Group RC/AG-26 framework to study the acoustic and aerodynamic characteristics of small rotors, including the influence of the rotor-rotor interactions. Two rotors with three-bladed propellers with a diameter D=393.7 mm were tested at a constant rotational speed of 5200 RPM, for different rotating verses and geometry configurations. Two rotor configurations were assessed in hover, i.e., either a baseline comprised of one isolated rotor, or two rotors arranged side-by-side. The aerodynamic loads, flow field ve

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Su, D. C., Y. J. Shi, and G. H. Xu. "Numerical study of the rotational direction effect on aerodynamic loading characteristics of shipborne helicopter rotor." Aeronautical Journal 123, no. 1263 (2019): 635–57. http://dx.doi.org/10.1017/aer.2019.20.

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ABSTRACTNumerical simulations of ship/rotor-coupled flowfield have been performed to investigate the rotational direction effects on a shipborne single-rotor helicopter in different deck landing trajectories (i.e., lateral and longitudinal translation) based on Reynolds-averaged Navier-Stokes (RANS) solver. Both the momentum source model and moving overset mesh model are employed to simulate the effect of the rotor on the ship airwake for different levels of fidelity requirement. The aerodynamic loading characteristics in terms of time-averaged and root-mean-square (RMS) thrust and pitch and r

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Zou, Yingyong, Mukai Wang, Duhui Lu, Yongde Zhang, Zili Xu, and Yeyin Xu. "Nonlinear Vibration Characteristics and Bifurcations of a Rotor System Subjected to Brush Seal Forces." Applied Sciences 13, no. 20 (2023): 11539. http://dx.doi.org/10.3390/app132011539.

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In the paper, nonlinear vibration characteristics of a rotor system are investigated. Such a nonlinear rotor system is subjected to brush seal forces, which are obtained by integrating the bristle force along the entire ring. The nonlinear brush seal rotor system is constructed by merging a flexible rotor with nonlinear seal forces. The research is aimed at studying the nonlinear vibration characteristics and bifurcations of the motions under a variety of eccentricity circumstances. Different kinds of bifurcations are successfully obtained by mathematical discretization and mapping manipulatio

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Zhu, Rui, Guang-chao Wang, Qing-peng Han, An-lei Zhao, Jian-xing Ren, and Xin Xia. "Dynamic Characteristics and Experimental Research of a Two-Span Rotor-Bearing System with Rub-Impact Fault." Shock and Vibration 2019 (September 15, 2019): 1–15. http://dx.doi.org/10.1155/2019/6309809.

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Rotor rub-impact has a great influence on the stability and safety of a rotating machine. This study develops a dynamic model of a two-span rotor-bearing system with rubbing faults, and numerical simulation is carried out. Moreover, frictional screws are used to simulate a rubbing state by establishing a set of experimental devices that can simulate rotor-stator friction in the rotor system. Through the experimental platform and its analysis system, the rubbing experiment was conducted, and the vibration of the rotor-bearing system before and after the critical speed is observed. Rotors runnin

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Buzuluk, V. I., K. G. Kosushkin, and V. I. Mavritsky. "Multi-rotor helicopter type platform capacities research." Civil Aviation High Technologies 22, no. 6 (2019): 66–74. http://dx.doi.org/10.26467/2079-0619-2019-22-6-66-74.

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The development of multi-rotor helicopter concepts, driven by the active introduction of brushless electric motors, leads to the necessity of assessing the multi-rotor scheme main advantages implementing possibility and determining the rational areas of its application. The article analyzes the concept of a multi-rotor platform with a distributed power plant. Parametric study of characteristics depending on the number of rotors for a line of multi-propeller aircraft with take-off weight from 0.5 to 120 tons was carried out. Evaluation of weight and dimensional characteristics of blades, main r

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Hayami, H., Y. Senoo, Y. I. Hyun, and M. Yamaguchi. "Effects of Tip Clearance of Nozzle Vanes on Performance of Radial Turbine Rotor." Journal of Turbomachinery 112, no. 1 (1990): 58–63. http://dx.doi.org/10.1115/1.2927421.

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In radial turbines with variable nozzles, the flow downstream of the nozzles could be distorted by the leakage flow through the tip clearance of the upstream nozzle vanes. To investigate the effects of flow distortion on the performance of turbine rotors, two rotors with different numbers of blades were tested for three types of distorted velocity distribution at the rotor inlet. In the case of the 20-blade rotor with moderate blade loading, the flow distortion at the rotor inlet had a negligible effect on the rotor characteristics, and the measured data on the turbine performances agreed well

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Zhang, Hongxian, Liangpei Huang, Xuejun Li, et al. "Spectrum Analysis of a Coaxial Dual-Rotor System with Coupling Misalignment." Shock and Vibration 2020 (July 10, 2020): 1–19. http://dx.doi.org/10.1155/2020/5856341.

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The finite element model of a dual-rotor system was established by Timoshenko beam element. The dual-rotor system is a coaxial rotor whose supporting structure is similar to that of an aero-engine rotor system. The inner rotor is supported by three bearings, which makes it a redundantly supported rotor. The outer rotor connects the inner rotor by an intershaft bearing. The spectrum characteristics of the dual-rotor system under unbalanced excitation and misalignment excitation were analysed in order to study the influence of coupling misalignment of the inner rotor on the spectral characterist

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Nguyen, Trong Linh, and Yu Ren Wu. "A Novel Rotor Profile Generation Method for Claw-Type Vacuum Pumps Based on Sealing Line." Applied Mechanics and Materials 894 (September 2019): 34–40. http://dx.doi.org/10.4028/www.scientific.net/amm.894.34.

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The sealing line between two conjugated rotors is a main leakage path in the vacuum pump, however, it is unable to be adjusted before the rotor profiles are determined in the traditional rotor profile generation method. Therefore, a generation method of rotor profiles for claw-type vacuum pumps based on the sealing line is proposed in this paper. The sealing line can be firstly specified as specific segments regarding the characteristics of claw-shaped rotor profiles. By applying the enveloping theory and the cubic spline curve fitting method, the rotor profile is able to be generated from the

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El-Shafei, A., and R. V. Eranki. "Dynamic Analysis of Squeeze Film Damper Supported Rotors Using Equivalent Linearization." Journal of Engineering for Gas Turbines and Power 116, no. 3 (1994): 682–91. http://dx.doi.org/10.1115/1.2906874.

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The technique of equivalent linearization is presented in this paper as a powerful technique to perform nonlinear dynamic analysis of squeeze film damper (SFD) supported rotors using linear rotor-dynamic methods. Historically, it is customary to design SFDs for rotor-dynamic analysis by assuming circular-centered orbits, which is convenient in making the nonlinear damper coefficients time independent and thus can be used in an iterative approach to determine the rotor-dynamic characteristics. However, the general synchronous orbit is elliptic in nature due to possible asymmetry in the rotor su

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Nie, Weijian, Xiaoguang Yang, Guang Tang, Qicheng Zhang, and Ge Wang. "Effect of Oil Film Radial Clearances on Dynamic Characteristics of Variable Speed Rotor with Non-Concentric SFD." Machines 12, no. 12 (2024): 882. https://doi.org/10.3390/machines12120882.

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Variable-speed aircraft engines require the power turbine rotor to operate stably within a wide range of output speeds, posing a challenge for rotor vibration reduction design. Non-concentric squeeze film dampers (NCSFDs) have been widely used in rotor vibration reduction design due to their simple structure. However, comprehensive research on the matching and applicability of NCSFDs under varying operating speeds is lacking. Therefore, this paper investigates the influence of oil film radial clearances on the dynamic characteristics of a variable-speed rotor system with an NCSFD, examining it

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Hou, Shengliang, Lei Hou, Shiwei Dun, Yufeng Cai, Yang Yang, and Yushu Chen. "Vibration Characteristics of a Dual-Rotor System with Non-Concentricity." Machines 9, no. 11 (2021): 251. http://dx.doi.org/10.3390/machines9110251.

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A finite element model of an aero-engine dual-rotor system with intermediate bearing supported by six bearings is set up. Three modes of non-concentricity caused by the assembly process are defined, namely parallel non-concentricity, front deflection angle non-concentricity and rear deflection angle non-concentricity. The influence of the non-concentricity on the vibration characteristics of the dual-rotor system is investigated in detail. The results show that the parallel non-concentricity and the front deflection angle non-concentricity have a significant influence on the bending vibration

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Yan, Wei, Lidong He, Zhe Deng, and Xingyun Jia. "Experimental research on suppressing unbalanced vibration of rotor by integral squeeze film damper." International Journal of Turbo & Jet-Engines 40, no. 4 (2021): 449–62. http://dx.doi.org/10.1515/tjj-2021-0015.

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Abstract As a novel structural damper, the unique structural characteristics of the integral squeeze film damper (ISFD) solve the nonlinear problem of the traditional squeeze film damper (SFD), and it has good linear damping characteristics. In this research, the experimental studies of ISFD vibration reduction performance are carried out for various working conditions of unbalanced rotors. Two ball bearing-rotor system test rigs are built based on ISFD: a rigid rotor test rig and a flexible rotor test rig. When the rotational speed of rigid rotor is 1500 rpm, ISFD can reduce the amplitude of

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Yoshida, Shigeo, Haruto Fuchiwaki, and Koji Matsuoka. "Development of Individual Rotor Mutual Induction (IRMI) Method for Coaxial Counter-Rotating Rotor." Applied Sciences 14, no. 11 (2024): 4782. http://dx.doi.org/10.3390/app14114782.

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A coaxial counter-rotating rotor (CCRR), which has two rotors rotating in the opposite directions on the same axis, is seen as a promising technology for low-cost floating tidal current/ocean current power generation using single-point mooring, as the torques of the front and rear rotors are cancelled. In the evaluation and design of such turbines, there is a need for an accurate analysis method with a low computational load that considers the strong mutual induction between the two rotors placed close together. An individual rotor mutual induction (IRMI) method was developed in this study, ai

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Lee, A.-C., and Y.-P. Shih. "Identification of the Unbalance Distribution and Dynamic Characteristics of Bearings in Flexible Rotors." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 5 (1996): 409–32. http://dx.doi.org/10.1243/pime_proc_1996_210_216_02.

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This paper presents a new method for estimating dynamic characteristics of bearings and unbalance distribution in flexible rotors based on the transfer matrix method for analysing the steady state responses of rotor-bearing systems, in which rotary inertia, gyroscopic and transverse-shear effects are also considered. Identification can be realized from the measured response data influenced by bearing characteristics and rotor unbalance using the least-squares method. Justification of the method is presented by numerical simulations.

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Zhu, He, Shaoxiong Wei, Hong Nie, Yuhao Du, and Xiaohui Wei. "Ground Effect on the Thrust Performance of Staggered Rotor System." Drones 8, no. 4 (2024): 118. http://dx.doi.org/10.3390/drones8040118.

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In this study, the thrust performance of a staggered rotor system in-ground effect (IGE) and out-of-ground effect (OGE) while considering the interaction on wake characteristics were investigated experimentally. A thorough comprehension of their performance holds significant importance for trajectory planning, aircraft design, landing safety, and energy-efficient landings. The complex interactions within staggered rotor systems and the impact of ground effects make rotor distance and ground interactions critical factors influencing near-ground flight performance. The study investigated the inf

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Panchenko, Anatolii, Angela Voloshina, Irina Milaeva, Igor Panchenko, Olena Titova, and . "The Influence of the form Error after Rotor Manufacturing on the Output Characteristics of an Orbital Hydraulic Motor." International Journal of Engineering & Technology 7, no. 4.3 (2018): 1. http://dx.doi.org/10.14419/ijet.v7i4.3.19542.

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The technology of rotors manufacturing for orbital hydraulic motors causes a certain form error of the gear surface. This leads to oscillations of the diametrical gap between the rotors. Such oscillations have a negative effect on the change in the output characteristics of the orbital motor. The previous studies on the issue consider the interaction between the rotors of orbital hydraulic machines as a gapless (theoretical) connection. The authors do not take into account that between the rotors of the orbital hydraulic motor, there is no rigid kinematic connection. This allows the internal r

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Wang, Zhi, Rui Sun, Yu Liu, Yudong Yao, and Jing Tian. "Analysis of Nonlinear Vibration Characteristics and Whirl Behavior of Dual-Rotor Systems with Inter-Shaft Rub Impact." Mathematics 12, no. 10 (2024): 1436. http://dx.doi.org/10.3390/math12101436.

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Previous studies on rub-impact faults have mainly focused on the rub-impact between rotors and stators, with less research on inter-rotor rub impact. The impact of inter-rotor rub impact on rotor nonlinear vibration is particularly significant. This study investigates the effects of inter-shaft rub impact on the vibration characteristics and whirl behavior of dual-rotor systems. Initially, a dual-rotor model with inter-shaft bearings is established using the finite element method, and inter-shaft rub-impact forces are derived based on contact mechanics. Next, the system response is solved usin

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50

Huang, Surui, Chengyuan Sun, Yaodong Yang, Hongchang Chen, and Kai Yang. "Numerical simulation of the effect of helicopter flight advance ratio and lift rate on rotor aerodynamic noise." Journal of Physics: Conference Series 2764, no. 1 (2024): 012048. http://dx.doi.org/10.1088/1742-6596/2764/1/012048.

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Abstract To study the aerodynamic noise characteristics of helicopter rotors under different flight states, this paper combined with the FW-H calculation equation, adopted NACA0012 airfoil and ROBIN fuselage to form a helicopter model and used FLUENT software to simulate different flight states of the helicopter. The influence of the two flight parameters, advance ratios, and lift rates, on the aerodynamic noise characteristics of the rotor, is studied. The results show that with the increase of helicopter advance ratio, the aerodynamic noise generated by the rotor becomes larger, and the effe

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