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Journal articles on the topic 'Air Rotor'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Tinney, Charles, John Valdez, and Irene Zhao. "The acoustics of multirotor platforms for urban air mobility." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A292. http://dx.doi.org/10.1121/10.0023567.

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The sound field of hovering rotors has generated tremendous interest in recent years with the prospect of urban air mobility platforms comprising eVTOL type designs. In this presentation, we will review a number of key advancements that have been made with regard to an understanding of the sound field produced by multirotor systems in hover and how it relates to the aerodynamic performance of the rotor. Much of this work is based on laboratory-scale measurements of different configurations starting with multirotor drones comprising quad-copter, hexacopter, and even octocopter arrangements (Tin

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2

Sun, Jinji, Jianyi Ren, and Haoxi Sun. "A Novel Design of an Inner Rotor for Optimizing the Air-Gap Magnetic Field of Hollow-Cup Motors." Machines 10, no. 5 (2022): 314. http://dx.doi.org/10.3390/machines10050314.

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In order to obtain a high power density, spacecraft usually use hollow-cup motors with trapezoidal air-gap magnetic field waveforms. However, due to structural issues, the hollow-cup motor has the problem that the waveform of the air-gap magnetic field is inconsistent with the ideal trapezoidal waveform, which causes torque ripples. In order to reduce torque ripples, the existing method only changes the structure of PMs; the changed PMs are difficult to magnetize and manufacture, which causes the air-gap magnetic field waveform to be unsuitable as the ideal waveform. This paper proposes a nove

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3

Gnemmi, Patrick, Kevin Meder, and Christian Rey. "Aerodynamic Performance of a Gun Launched Micro Air Vehicle." International Journal of Micro Air Vehicles 4, no. 4 (2012): 251–72. http://dx.doi.org/10.1260/1756-8293.4.4.251.

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The study deals with the prediction of the aerodynamic performance of the Gun Launched Micro Air Vehicle (GLMAV) platform by using the ANSYS CFX code. A first step consisted of the validation of the numerical simulation on a two-bladed rotor, which has a diameter of 0.20 m. This micro-rotor model is the perfect reproduction at a scale of 1:10 of the rotor bench that ISL had studied in the nineties. The validation was made by the comparison of the computed thrust and torque with the measured ones. These results proved the ability of the ANSYS CFX code to predict the flow field around MAV rotors

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4

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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5

Freitas, Felipe Augusto Lustosa Meireles, Ronaldo Barcelos e. Silva, Leonardo Da Rosa Schmidt, Silvana Maldaner, and Lucinéia Fabris. "Análise da potência mecânica de rotores de Savonius de mesma razão de aspecto." Ciência e Natura 42 (February 7, 2020): 33. http://dx.doi.org/10.5902/2179460x40635.

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An experimental performance study of Savonius small rotors is performed in this work. Two Savonius prototypes, two blades and the same aspect ratio, were constructed from vinyl polychloride and use different air flow. Experimental tests allowed the rotation speed of each rotor to be determined for different air flows. It is important to note that the average angular velocity of the smaller rotor is approximately fifty percent higher than the larger rotor. At the same time, the absorption torque on the rotor shaft was measured and the mechanical power of each Savonius wind turbine prototype was

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6

Zhang, Liu, Zhanpeng Cui, Pengfei Song, Liming Wang, and Xikai Liu. "Sinusoidal Rotor Core Shape for Low Torque Ripple in Hollow-Cup Machines." Energies 17, no. 13 (2024): 3168. http://dx.doi.org/10.3390/en17133168.

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Due to the configuration of coreless stators and two synchronously rotated rotors, hollow-cup machines (HCMs) enjoy the merits of negligible cogging torque and core loss. Consequently, HCMs have been successfully employed as high-speed electric machines in the aerospace field, which requires high precision and low thermal dissipation. However, the permanent magnet (PM) thickness and air-gap length of conventional HCM are uniform, resulting in various harmonics in the air-gap flux density as well as back-EMF. These harmonics inevitably produce an electromagnetic torque ripple, which has not met

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7

Toylbay, Ozgerishan, Gulzhan Seifulla, Aidos Moldabekov, Dastan Yergaliyev, and Uljalgas Adilbayeva. "THE EFFECT OF SURFACE ROUGHNESS AND ELECTROSTATIC BONDS OF RESIDUAL GASES ON THE SETTLING OF THE GYROSCOPE ROTOR." Вестник КазАТК 132, no. 3 (2024): 110–19. http://dx.doi.org/10.52167/1609-1817-2024-132-3-110-119.

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Consider the rotor of an electrostatic gyroscope (ESG) for contactless operation. The rotors of the ESG are made in the shape of a ball and placed in an electric field. The gyroscope operates contactless between the rotor and the mutual oscillation force of the electrodes. Air is sucked out of the chamber in which the rotor is located. Due to the lack of air resistance and the lack of friction force, the rotor can rotate for a long time. But the rotor, located inside the vacuum, also slows down. The reason for this is the roughness and residual deposits of the rotor surface. This is the notori

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8

Mathew, Bilji C., Prasun Banerjee, Muhammad Fawaz, Samprit Roy, Aritra Laha, and Manasa Bhatt. "A Review on Vibration Analysis of Helicopter Rotor Blade." International Journal for Research in Applied Science and Engineering Technology 10, no. 2 (2022): 1363–69. http://dx.doi.org/10.22214/ijraset.2022.40533.

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Abstract: Vibration has always been a major disturbance for helicopter. Vibrations, thus, a threat to components of helicopter. The vibration created by a helicopter draws a great contribution to the reduction in life of the components. Reducing the vibration that creates from helicopter rotor blades, tail rotors is a one step closer to this crisis. Helicopter Vibration control is a topic of research into designing helicopter rotor blade which can be operated more efficiently. The major source of the vibration come from the rotor blade rotation. By trying to upgrade new design in the helicopte

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9

(Kevin) Li, Sicheng, and Seongkyu Lee. "Prediction of Urban Air Mobility Multirotor VTOL Broadband Noise Using UCD-QuietFly." Journal of the American Helicopter Society 66, no. 3 (2021): 1–13. http://dx.doi.org/10.4050/jahs.66.032004.

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This paper investigates broadband noise of multirotor urban air mobility (UAM) vertical take-off and landing (VTOL) vehicles. Based on an earlier single-rotor trailing-edge noise prediction method, a multirotor broadband noise prediction program is developed, where the multirotor coordinate transformation is included, and the amplitude modulation capability is introduced. Thereafter, the program is used to predict broadband noise from three UAM VTOL conceptual designs and a vertiport conceptual design. It is found that UAM VTOL vehicles' broadband noise is important in the high-frequency range

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10

Lei, Yao, and Rongzhao Lin. "Effect of wind disturbance on the aerodynamic performance of coaxial rotors during hovering." Measurement and Control 52, no. 5-6 (2019): 665–74. http://dx.doi.org/10.1177/0020294019834961.

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The ability to resist the effect of wind disturbance is vital for micro air vehicles. As the most compact rotor configuration for micro air vehicles, coaxial rotors will be the preferred choice for this type of devices. In this paper, the aerodynamic performance of the coaxial rotors considering the wind gust is presented with both experiments and simulations. First, effect of wind disturbances on the micro air vehicles flight was introduced. Then, low-speed wind tunnel tests were performed on a coaxial rotor with a spacing 0.39 R to obtain the performance in both horizontal and vertical wind

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11

Allaire, P. E., M. E. F. Kasarda, and L. K. Fujita. "Rotor Power Losses in Planar Radial Magnetic Bearings—Effects of Number of Stator Poles, Air Gap Thickness, and Magnetic Flux Density." Journal of Engineering for Gas Turbines and Power 121, no. 4 (1999): 691–96. http://dx.doi.org/10.1115/1.2818528.

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Rotor Power losses in magnetic bearings cannot be accurately calculated at this time because of the complexity of the magnetic field distribution and several other effects. The losses are due to eddy currents, hysteresis, and windage. This paper presents measured results in radial magnetic bearing configurations with eight pole and 16 pole stators and two laminated rotors. Two different air gaps were tested. The rotor power losses were determined by measuring the rundown speed of the rotor after the rotor was spun up to speeds of approximately 30,000 rpm, DN = 2,670,000 mm-rpm, in atmospheric

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12

Lu, Y., K. Hoang, D. Noake, and N. Low. "Design and analysis of conical rotary compressor." IOP Conference Series: Materials Science and Engineering 1267, no. 1 (2022): 012001. http://dx.doi.org/10.1088/1757-899x/1267/1/012001.

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Conical Rotary Compressor (CRC) is a screw type Positive Displacement Machine (PDM) consisting of one inner rotor rotating inside an outer rotor. The conical internal meshing rotors with the feature of variable pitch and rotor profile have an inherent capability to operation at high pressure ratio due to high built-in volume ratio and low leakage. CRC has potential to run in various applications such as Heating, Ventilation, and Air Conditioning (HVAC) system, vacuum pumps, and air compressors. The performance of the machine is heavily affected by rotor profile and rotor geometry. In this pape

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13

Ren, Jiakan, and Hong Zhang. "Critical speed analysis on high-speed foil bearing rotor of fuel cell air compressor." Journal of Physics: Conference Series 3043, no. 1 (2025): 012034. https://doi.org/10.1088/1742-6596/3043/1/012034.

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Abstract Based on the characteristic analysis of dynamic pressure gas bearing, the reliability analysis of high-speed rotors of fuel cell air compressors is carried out in this paper, which is of great significance for the study of the safety of automotive fuel cell systems. The calculation method of rotor critical speed is introduced, and its key role in the reliability analysis of the rotor system is analyzed. The dynamic pressure gas bearing used in the rotor system is calculated and analyzed, and its stiffness and damping changes with the speed are obtained. Based on the calculated bearing

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14

Chi, Zhongzhe, Greg F. Naterer, and Yuping He. "EFFECTS OF BRAKE DISC GEOMETRICAL PARAMETERS AND CONFIGURATIONS ON AUTOMOTIVE BRAKING THERMAL PERFORMACE." Transactions of the Canadian Society for Mechanical Engineering 32, no. 2 (2008): 313–24. http://dx.doi.org/10.1139/tcsme-2008-0020.

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This paper examines the effects of geometrical parameters of pillar post rotors on the thermal performance of automotive vehicle brakes. The thermal performance of vented disc brakes strongly depends on the aerodynamic characteristics of the air flow through the rotor passages. These air flow passages are determined by the geometrical parameters of the brake rotors. In this study, different pillar post rotor models are considered and the corresponding numerical simulations are performed, in order to investigate the effects of various geometrical parameters on the thermal performance. These geo

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15

Gannon, Anthony J., and Garth V. Hobson. "Performance Testing on Transonic Rotors." Mechanical Engineering 132, no. 08 (2010): 52–53. http://dx.doi.org/10.1115/1.2010-aug-8.

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This article discusses the performance testing of transonic rotors at the Turbopropulsion Laboratory at the Naval Postgraduate School. The Mach number is one of the most important parameters in the case of high-speed compressors. In order to limit power consumption in a test machine, the simplest change is to scale down the machine. A second concept to reduce the power consumption of the machine once it has been scaled down is to throttle the flow before the rotor rather than after it. As a high-speed rotor compresses the incoming air by around 1.4–1.6 times, the air leaving it is appreciably

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16

Cornelius, Jason, Sven Schmitz, Jose Palacios, Bernadine Juliano, and Richard Heisler. "Rotor Performance Predictions for Urban Air Mobility: Single vs. Coaxial Rigid Rotors." Aerospace 11, no. 3 (2024): 244. http://dx.doi.org/10.3390/aerospace11030244.

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This work details the development and validation of a methodology for high-resolution rotor models used in hybrid Blade Element Momentum Theory Unsteady Reynolds Averaged Navier–Stokes (BEMT-URANS) CFD. The methodology is shown to accurately predict single and coaxial rotor performance in a fraction of the time required by conventional CFD methods. The methodology has three key features: (1) a high-resolution BEMT rotor model enabling large reductions in grid size, (2) a discretized set of momentum sources to interface between the BEMT rotor model and the structured URANS flow solver, and (3)

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17

Vahdati, Mehrdad, E. Azimi, and Ali Shokuhfar. "Air Characteristics in Air Turbine Spindle of Ultra Precision Machines." Defect and Diffusion Forum 297-301 (April 2010): 396–401. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.396.

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Air Spindles have been used in ultra precision machines for several years due to their advantages such as high speed rotation, low friction, and low vibration, [1]. Air spindles are widely used in these machines for producing precise work pieces. Although, spindles function on a very complicated theoretical basis, [2, 3], their structure is very simple and consists of mainly a rotor and a stator. The rotor/stator could be made of different shapes. A cylindrical shape is the one commonly in use. The spindle designed in this work has a spherical configuration. It has been designed so that it cou

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18

Zhu, He, Siqiang Deng, Shaoxiong Wei, Hong Nie, and Xiaohui Wei. "Experimental Investigation on Thrust Performance of a Small-Scale Staggered Rotor System in Hover." Drones 7, no. 11 (2023): 677. http://dx.doi.org/10.3390/drones7110677.

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In recent years, the demand for Urban Air Mobility (UAM) and Micro Aerial Vehicles (MAVs) has driven the emergence of new aircraft designs, with the Staggered Rotor System being widely applied in these vertical take-off and landing aircraft. Due to the complex aerodynamic interference between rotors, the spacing between them has a significant impact on the performance of these new aircraft configurations. A testbed was designed and validated to investigate the effects of parameters such as axial distance and lateral distance between rotors on the thrust performance of the Staggered Rotor Syste

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19

LI, Yuhong, Zhida MA, Peng ZHOU, Siyang ZHONG, and Xun HUANG. "A computational aeroacoustic study of a multi-rotor powered urban air mobility vehicle." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 5 (2023): 3077–88. http://dx.doi.org/10.3397/in_2023_0446.

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The multi-rotor propulsion system has become one of the popular configurations for urban air mobility vehicles due to its capability of high-density vertical take-off and landing operations. The noise characteristics, as a critical criterion for urban air mobility, usually differ for a multi-rotor configuration from a single-rotor configuration. In this work, we investigate the noise generated by a hexacopter configuration using delayed detached eddy simulations and the Ffowcs-Williams and Hawkings acoustic-analogy-based solver. The overall length and the rotor diameter of the vehicle are 4 m

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20

Song, Yan Dong. "Secondary Developing and Finite Element Analysis on Screw Compressor of Automotive Air Conditioning." Applied Mechanics and Materials 467 (December 2013): 492–95. http://dx.doi.org/10.4028/www.scientific.net/amm.467.492.

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The three-screw compressor is a special type of positive displacement compressors that has two or more intermeshing screws rotating axially to deliver fluids. Three-screw compressor depend mainly on master-slave screw meshing with each other forming seal cavity so as to delivery liquid from the suction to the outlet. So it is important to design the screw profile accurately to obtain a high volumetric efficiency of the screw compressor. Through the central rotor and idler rotors three-dimensional model, we can directly obtain the central rotor and idler rotors law Section Surface contour and l

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21

Shukla, Dhwanil, and Narayanan Komerath. "Multirotor Drone Aerodynamic Interaction Investigation." Drones 2, no. 4 (2018): 43. http://dx.doi.org/10.3390/drones2040043.

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Aerodynamic interactions between rotors are important factors affecting the performance of in-plane multirotor Unmanned Air Vehicles (UAVs) or drones, which are the majority of small size UAVs (or mini-drones). Optimal design requires knowledge of the flow features. The low Reynolds number of many UAV rotors raises the question of how these features differ from those expected by traditional analytical methods for rotorcraft. Aerodynamics of a set of side-by-side rotors in hover over a range of rotor separation and Reynolds number is studied using high-speed Stereo Particle Image Velocimetry (S

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22

Hrishikeshavan, Vikram, and Inderjit Chopra. "Aeromechanics and Control of a Shrouded Rotor Micro Air Vehicle in Hover and in Edgewise Flow." Journal of the American Helicopter Society 56, no. 4 (2011): 1–14. http://dx.doi.org/10.4050/jahs.56.042004.

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Shrouded rotors are efficient in hover but are quite sensitive to disturbances in external flow. In this paper, the dynamics and control of a shrouded rotor micro air vehicle is studied in hover and when it is subjected to edgewise gust. The importance of incorporating a hingeless rotor in a shrouded rotor configuration was shown and was flight-tested in hover using a proportional-integral attitude feedback controller. In edgewise flow, the shrouded rotor produced up to 300% higher pitching moment than the unshrouded rotor. To counter this pitching moment, the control moments were about 80–100

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23

Liu, Mingkun, Chuang Wang, Yaoxiang Han, and Ziwen Xing. "Potential Evaluation of Twin-Screw Air Expanders with Dual-Lead Rotors Used in PEMFC Systems." Applied Sciences 14, no. 21 (2024): 9983. http://dx.doi.org/10.3390/app14219983.

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The reduction in the power cost of air supply systems has emerged as a critical challenge in the development of polymer electrolyte membrane fuel cells. This study proposes the use of dual-lead rotors to improve the performance of twin-screw expanders for the purpose of boosting expanders’ recovery power and consequently lowering the power cost of the air supply subsystem, which is hardly investigated in previous publications. For this purpose, a mathematical model is built to assess the potential of improving the expander performance by means of the dual-lead rotors. And the influence of lead

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24

Zhu, He, Yuhao Du, Hong Nie, Zhiyang Xin, and Xi Geng. "Experimental Investigation of Aerodynamic Interaction in Non-Parallel Tandem Dual-Rotor Systems for Tiltrotor UAV." Drones 9, no. 5 (2025): 374. https://doi.org/10.3390/drones9050374.

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The distributed electric tilt-rotor Unmanned Aerial Vehicle (UAV) combines the vertical take-off and landing (VTOL) capability of helicopters with the high-speed cruise performance of fixed-wing aircraft, offering a transformative solution for Urban Air Mobility (UAM). However, aerodynamic interference between rotors is a new challenge to improving their flight efficiency, especially the dynamic interactions during the transition phase of non-parallel tandem dual-rotor systems, which require in-depth investigation. This study focuses on the aerodynamic performance evolution of the tilt-rotor s

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25

Suroso, Indreswari, and Hendriana Helda Pratama. "Analysis Mapping of Long Dry With Drone Type Dji Spark in Hargowilis, Kokap, Kulonprogo." Journal of Applied Geospatial Information 4, no. 1 (2020): 259–64. http://dx.doi.org/10.30871/jagi.v4i1.1858.

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This research was conducted in the village of Hargowilis, Kokap District, Kulon Progo Regency with a temperature of 31oC, with a wind speed of 13 km/h, 55% air humidity, and a height of 35 m from the ground surface. This research was carried out on November 8, 2019 with hot weather conditions and wind speeds of around 13 km/hour. The purpose of this study is to map the drought area in Mount Menoreh Hargowilis Village, Kokap, Kulon Progo. The method used in this study are preparation for making a drone, survey of area Menoreh hills in Hargowilis, Kokap, Kulon Progo planning testing at certain a

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26

Kekus-Kumor, Pawel, and Adam Sieradzki. "Experimental investigation of unmanned air vehicle rotor aeroacoustics using benchmark geometries." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 3 (2023): 5440–51. http://dx.doi.org/10.3397/in_2023_0769.

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A series of benchmark and off-the-shelf unmanned air vehicle rotors with diameters around 12 inches was tested in the newly-built anechoic chamber at the Łukasiewicz Research Network - Institute of Aviation, as well as in an open field. The aerodynamic performance of the rotors was assessed using thrust and torque meters embedded in a custom testing rig, and their acoustic characteristics, including directivity, were determined using a column of free-field microphones. The characteristics of the anechoic chamber, including the spatial distribution of background noise and the anechoic condition

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27

Sunay, Dharwadkar, Harmalkar Sarvesh, Nagzarkar Chinmay, and Tendulkar Vivkanand. "Surveillance FPV Drone with Obstacle Avoidance System." International Journal of Recent Technology and Engineering (IJRTE) 9, no. 3 (2020): 17–20. https://doi.org/10.35940/ijrte.C4204.099320.

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The unmanned air vehicle (UAV) is mostly used in inspection and surveillance operations recent. The UAV is also termed as vertical take-off landing (VTOL), since it is capable of vertical take-off and landing without need of a runway. The big tunnels, infrastructure and large bridges are inserted using UAV by photographic inspection. UAVs are also used for surveillance purposes by the military and by the security guards. Since this is a new technology of the last decade, deep research has to be done. UAVS have the cross structure arrangement to which the rotor blades are attached at the end po

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28

Song, Laiyun, Guoqin Yuan, Hongwen Zhang, Yalin Ding, and Kai Cheng. "Non-Linear Dynamic Analysis on Hybrid Air Bearing-Rotor System under Ultra-High Speed Condition." Materials 15, no. 2 (2022): 675. http://dx.doi.org/10.3390/ma15020675.

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The non-linear dynamic behavior of a hybrid air bearing-rotor system is very complicated and requires careful attention when designing to avoid spindle failure, especially under ultra-high speed condition. In this paper, the rotor trajectory of a hybrid air bearing-rotor system is obtained by solving the unsteady Reynolds equation and motion equations simultaneously. The typical non-linear behavior of hybrid air bearing-rotor systems is illustrated with the analysis of the rotor trajectory, the phase angle, time domain vibration and power spectral density. Furthermore, the influences of the ro

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29

Etemad, M. R., K. Pullen, C. B. Besant, and N. Baines. "Evaluation of Windage Losses for High-Speed Disc Machinery." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 206, no. 3 (1992): 149–57. http://dx.doi.org/10.1243/pime_proc_1992_206_025_02.

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Design and development of experimental apparatus is detailed for stator drag torque measurement as well as a method to evaluate rotor windage losses directly from air mass flow and temperature changes. Effects of air jets at the rotor rim were also investigated. Results are presented for air windage losses associated with ultra-high-speed machinery. These show that within the range investigated the air gap length between the rotor and the stator has an insignificant effect on windage losses. The lowest windage losses were encountered when air was forced through the rotor/stator gap from the di

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30

Du, Jingjuan, Chaojiang Li, Jian Zhao, Xinyu Huang, Yupeng Liu, and Haiying Lv. "Rotor Investigation of High-Speed Permanent Magnet Motor with Roundness Error and CFD-Thermal Distribution Analysis." Energies 15, no. 13 (2022): 4606. http://dx.doi.org/10.3390/en15134606.

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The rotor overtemperature caused by losses is one of the important issues for the high-speed electrical machine. This paper focuses on the rotor loss analysis and CFD-thermal coupling evaluation for 105 kW, 36,000 r/min HSPMSM. Three types of sleeve materials as carbon-fiber, Titanium alloy, and stainless steel are introduced in this paper, researching the effects of sleeve conductivity, thickness and rotational speed on rotor eddy current loss, balancing rotor mechanical strength. The sleeve made of titanium alloy material with a thickness of 3.5 mm is chosen to effectively suppress the rotor

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Barkat, Ibtissem, Abdelouahab Benretem, Fawaz Massouh, Issam Meghlaoui, and Ahlem Chebel. "Modeling and simulation of forces applied to the horizontal axis wind turbine rotors by the vortex method coupled with the method of the blade element." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 1 (2021): 413. http://dx.doi.org/10.11591/ijpeds.v12.i1.pp413-420.

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This article aims to study the forces applied to the rotors of horizontal axis wind turbines. The aerodynamics of a turbine are controlled by the flow around the rotor, or estimate of air charges on the rotor blades under various operating conditions and their relation to the structural dynamics of the rotor are critical for design. One of the major challenges in wind turbine aerodynamics is to predict the forces on the blade as various methods, including blade element moment theory (BEM), the approach that is naturally adapted to the simulation of the aerodynamics of wind turbines and the dyn

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32

Ibtissem, Barkat, Benretem Abdelouahab, Massouh Fawaz, Meghlaoui Issam, and Chebel Ahlem. "Modeling and simulation of forces applied to the horizontal axis wind turbine rotors by the vortex method coupled with the method of the blade element." International Journal of Power Electronics and Drive System (IJPEDS) 12, no. 1 (2021): 413–20. https://doi.org/10.11591/ijpeds.v12.i1.pp413-420.

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This article aims to study the forces applied to the rotors of horizontal axis wind turbines. The aerodynamics of a turbine are controlled by the flow around the rotor, or estimate of air charges on the rotor blades under various operating conditions and their relation to the structural dynamics of the rotor are critical for design. One of the major challenges in wind turbine aerodynamics is to predict the forces on the blade as various methods, including blade element moment theory (BEM), the approach that is naturally adapted to the simulation of the aerodynamics of wind turbines and the dyn

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33

Kotsur, I. M., M. I. Kotsur, D. S. Yarymbash, T. Ye Dyvchuk, Yu S. Bezverkhnia, and V. S. Ozerov. "Investigation of electromagnetic processes in the case of static eccentricity of a two-pole induction motor with a short-circuited rotor." Electrical Engineering and Power Engineering, no. 4 (April 24, 2024): 17–24. http://dx.doi.org/10.15588/1607-6761-2023-4-2.

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Purpose. Correction of the mathematical model of electromagnetic processes in a two-pole induction motor with a short-circuited rotor, taking into account static rotor eccentricity to identify diagnostic correlations. Methodology. Analytical modeling using the method of specific magnetic conductivity, mathematical modeling of electromagnetic fields in a three-phase induction motor with a short-circuited rotor using methods of electromagnetic field theory and finite element methods. Obtained results. The necessity of improving mathematical models for induction motors with short-circuited rotors

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Liu, Cong, Baiqing Li, Zhiqiang Wei, Zongwei Zhang, Zezhong Shan, and Yu Wang. "Effects of Wake Separation on Aerodynamic Interference Between Rotors in Urban Low-Altitude UAV Formation Flight." Aerospace 11, no. 11 (2024): 865. http://dx.doi.org/10.3390/aerospace11110865.

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In recent years, unmanned aerial vehicle (UAV) formation flight has become an effective strategy for urban air mobility (UAM). However, close rotor separation during formation flight leads to complex aerodynamic interference between rotors, significantly affecting UAV flight performance and operational safety. This study systematically examines the effects of axial and lateral rotor separation on the rotor’s thrust performance through wind tunnel experiments. The tests simulate horizontal, vertical, and hovering states by generating relative airflow in the wind tunnel, focusing primarily on th

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Han, Jia De, Guang Yu Hong, Lu Tang, and Yi Ping Lu. "Numerical Studies on the Flow Field of Stator and Air Gap for Large Air-Cooled Turbo-Generator." Advanced Materials Research 516-517 (May 2012): 970–75. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.970.

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In order to study the flow characteristics in the stator and air gap for a large air-cooled turbo-generator with multi-air-zone of stator, a 3-D physical model includes the stator, rotor, and air gap was established. Numerical simulation was carried out by the finite volume method according computational fluid dynamics (CFD) principle, based on some corresponding boundary conditions and assumptions. The results show that the cooling air flowing into the air-gap through the outlets of rotor wedge rotates with rotor in the spiral trajectory and in higher velocity than ambient. The air velocity a

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Kumar, Akshay, S. M. Ishtiaque, and K. R. Salhotra. "STUDY OF EFFECT OF SPINNING PROCESS VARIABLES ON THE PACKING DENSITY OF RING, ROTOR AND AIR-JET YARNS USING THE TAGUCHI METHOD." AUTEX Research Journal 6, no. 3 (2006): 122–35. http://dx.doi.org/10.1515/aut-2006-060302.

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Abstract The effect of lap hank, card draft, draft/doublings and drafts at speed frame, ring frame, rotor and air-jet on packing density parameters were analysed using the Taguchi method. The trends of change in packing density with process variables are opposite to those of the yarn diameter and helix angle of the ring, rotor and air-jet yarns studied. The packing density is found to be the highest in air-jet yarn and the lowest in rotor yarn. An increase in draft in the air-jet and a decrease in the rotor spinner increases the packing density of the respective yarns.

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Wu, Pey Shey, Min-Fu Hsieh, Yong En Lu, Wei Ling Cai, and Shyy Woei Chang. "Thermal Performance Improvement by Rotating Thermosyphon Loop in Rotor of an Interior Permanent Magnet Synchronous Electric Motor." Inventions 7, no. 2 (2022): 37. http://dx.doi.org/10.3390/inventions7020037.

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As an attempt to enable a further increase in the power-to-weight ratio of an electric motor by improving its cooling performance, rotating thermosyphon loops in a rotor of a permanent magnet synchronous electric motor are proposed. The effective thermal conductivity and airflow heat-transfer rate of the rotating thermosyphon loop and the convective heat-transfer coefficient over the annular interior surface of the air chamber are measured to permit the definition of the thermal boundary conditions for simulating the temperature fields of the electric motors. The axial heat-transfer pathway wi

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Li, Yangfan, Hongqi Wei, Chenghao Fan, and Weiwei Shi. "A Novel Numerical Simulation Study of Air Leakage in Rotary Air Preheaters Based on Rotor Thermal Deformation." Processes 12, no. 3 (2024): 505. http://dx.doi.org/10.3390/pr12030505.

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Thermal deformation of the rotor is a critical factor leading to radial air leakage in rotary air preheaters. However, previous studies have not comprehensively established the correlation between rotor thermal deformation during thermal operation and radial air leakage. This study addresses this gap by introducing a novel model for calculating radial air leakage, incorporating the thermal deformation of the rotor. To achieve this, we selected a three-section rotary air preheater from a 330 MW coal-fired unit boiler for investigation. This research begins by constructing a heat transfer–struct

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Wu, Han, Wangqiao Chen, Peng Zhou, et al. "Assessment and mitigation of the rotor noise for future urban air mobility vehicles." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 4 (2023): 4201–8. http://dx.doi.org/10.3397/in_2023_0595.

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Multi-rotor configurations are often adopted in urban air mobility (UAM) designs. The aerodynamic noise of rotors is a significant source of the UAM vehicles, requiring systematic measurements and mitigation. To this end, a large-scale test rig is designed and built to enable the acoustic measurement of UAM rotor blades. The test rig is placed in an anechoic chamber with the size of 8.1 m (L) × 6 m (W) × 5.1 m (H). The aerodynamic force and noise of a pair of custom-designed blades with a radius of 0.5 m are measured. The rotational speed ranges from 600 to 1800 revolutions per minute. A zig-z

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Goo, Nam Seo, Hoon Cheol Park, and Kwang Joon Yoon. "Conceptual Design, Thrust Test, and Finite Element Analysis of a Tip-Jet Rotor Using a Small Turbo-Jet Engine." Key Engineering Materials 306-308 (March 2006): 541–46. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.541.

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A general helicopter uses rotary power produced from the installed engine in order to get the directional thrust. In the case of a tip-jet rotor helicopter, the compressed air or the combustion gas passes through a duct system inside rotors and is ejected out of the nozzle at the blade tips to produce torque enough for rotation of the rotor system. The generated torque makes the rotor system rotate, so that it can create the directional thrust. Since the anti-torque does not occur in this tip-jet rotorcraft, the tail rotor can be removed, which can be very attractive. In this paper, a power sy

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Wu, Quanhui, Yazhou Sun, Wanqun Chen, Guoda Chen, Qingshun Bai, and Qingchun Zhang. "Effect of motor rotor eccentricity on aerostatic spindle vibration in machining processes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 7 (2017): 1331–42. http://dx.doi.org/10.1177/0954406217705686.

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In ultra-precision machining field, the air motorized spindle which is composed of a motor and an air bearing, plays a major role. In air motorized spindle, the motor eccentricity between the stator and the rotor is inevitably introduced during the manufacturing process, which directly affects the machining results of workpiece surface, and this phenomenon is particularly unwanted in machining. However, little attention has been paid to the motor eccentricity of air motorized spindle. In this paper, a new integrated electromechanical coupling method for estimating unbalanced force in air motor

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Wiśniewski, Piotr, Guojie Zhang, and Sławomir Dykas. "Numerical Investigation of the Influence of Air Contaminants on the Interfacial Heat Transfer in Transonic Flow in a Compressor Rotor." Energies 15, no. 12 (2022): 4330. http://dx.doi.org/10.3390/en15124330.

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Atmospheric air is a commonly used working fluid in turbomachinery. The air typically contains a certain amount of suspended solid particles, as well as water in the form of vapor or droplets. In the current paper, we focus on the numerical modeling of humid air transonic flow in turbomachinery. In this paper we demonstrate a rarely considered, but as presented herein important influence of air humidity, pollution and liquid water content on the performance of the first stage of the gas turbine compressor and turbofan engine fan (NASA rotors 37 and 67). We also discuss the impact of the interf

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Scheaua, Fanel Dorel. "Comparative Numerical Analysis on Vertical Wind Turbine Rotor Pattern of Bach and Benesh Type." Energies 13, no. 9 (2020): 2311. http://dx.doi.org/10.3390/en13092311.

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In this work, 3D models in classic configuration of Bach and Benesh rotor type, as well as models with modified blade pattern geometry were analyzed from the air circulation point of view inside the rotor enclosure in order to identify the operating parameters differences according to rotor geometric modified configuration. Constructive design aspects are presented, as well as results obtained from the virtual model analysis in terms of circulation velocity and pressure values which enhance rotor operation related to torque and power coefficients. The rotors design pattern is made according to

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Saad, Magedi Moh M., Sofian Mohd, Mohd Fadhli Zulkafli, Nor Afzanizam Samiran, and Djamal Hissein Didane. "CFD Simulation Study on the Performance of a Modified Ram Air Turbine (RAT) for Power Generation in Aircrafts." Fluids 6, no. 11 (2021): 391. http://dx.doi.org/10.3390/fluids6110391.

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The present paper aims to study the possibility of dispensing an auxiliary power unit (APU) in an aircraft powered by fossil fuels to reduce air pollution. It particularly seeks to evaluate the amount of power generated by the ram air turbine (RAT) using the novel counter-rotating technique while characterizing its optimum axial distance. The ram air turbine (RAT), which is already equipped in aircrafts, was enhanced to generate the amount of energy produced by the APU. The approach was implemented by a CRRAT system. Six airfoil profiles were tested based on 2D models and the best airfoil was

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Peters, Nicholas, Christopher Silva, and John Ekaterinaris. "A data-driven reduced-order model for rotor optimization." Wind Energy Science 8, no. 7 (2023): 1201–23. http://dx.doi.org/10.5194/wes-8-1201-2023.

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Abstract. For rotor design applications, such as wind turbine rotors or urban air mobility (UAM) rotorcraft and flying-car design, there is a significant challenge in quickly and accurately modeling rotors operating in complex, turbulent flow fields. One potential path for deriving reasonably accurate but low-cost rotor performance predictions is available through the application of data-driven surrogate modeling. In this study, an initial investigation is undertaken to apply a proper orthogonal decomposition (POD)-based reduced-order model (ROM) for predicting rotor distributed loads. The POD

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Wang, Xing, Wen Li, Xuehui Zhang, Yangli Zhu, Wei Qin, and Haisheng Chen. "Flow characteristic of a multistage radial turbine for supercritical compressed air energy storage system." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 6 (2017): 622–40. http://dx.doi.org/10.1177/0957650917743366.

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Compressed air in supercritical compressed air energy storage system expand from supercritical to atmospheric conditions at lower inlet temperature (<500 K) to generate MW scale power. Therefore, a new multistage radial turbine is adopted and the flow characteristic is investigated by numerical simulation. Effects of ideal gas model and tip clearance on the performance and flow field of the multistage turbine are revealed. Results show that ideal gas model can reveal flow pattern under supercritical condition correctly while leading to obvious deviation of isentropic enthalpy drop, entropy,

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Maklakov, Vladimir. "DEVELOPING A MODEL OF ELECTROMECHANICAL CONVERTER WITH AN ALL-METAL FERROMAGNETIC ROTOR." Automation and modeling in design and management 2022, no. 3 (2022): 94–100. http://dx.doi.org/10.30987/2658-6436-2022-3-94-100.

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The article presents the relevance of studying the characteristics of electromechanical con-verters with ferromagnetic all-metal rotors; gives a brief review of the research in this area. The aim of the work is to develop a model of an electromechanical converter with a ferromagnetic rotor. The paper substantiates the expediency of using the field approach when considering electromagnetic processes occurring in the air gap and the all-metal rotor of such converters. The accepted assumptions are described and the field problem solution is obtained, which makes it possible to determine the distr

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Qin, Ming, Ming Wei Ge, Wen Jiang Shi, and Shan Cai Xiao. "Optimization of Air Cooling Ribs for 1.5MW Wind Rotor Based on CFD." Advanced Materials Research 479-481 (February 2012): 50–54. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.50.

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To enhance heat exchange between the rotor and external environment, many ribs are arranged on the cover of the machine. The air cooling condition for 1.5MW wind rotor is evaluated by Computational fluid dynamics(CFD). It is found that the density of the air, the flow velocity and the arrangement of the ribs on the rotor cover is the main factors impacting the air cooling effect of the rotor. Under the same running power, the air cooling condition becomes worse with the decrease of air density and becomes better with the increase of wind speed. To improve the cooling condition of the wind roto

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Zhang, Wei, Bingbing Han, Kunpeng Zhang, and Qian Ding. "Dynamic Analysis of a Rotor System Supported on Squeeze Film Damper with Air Entrainment." International Journal of Bifurcation and Chaos 27, no. 14 (2017): 1750212. http://dx.doi.org/10.1142/s0218127417502121.

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Squeeze film dampers (SFDs) are widely used in compressors and turbines to suppress the vibration while traversing critical speeds. In practical applications, air ingestion from the outside environment and cavitation may lead to a foamy lubricant that weakens oil film damping and dynamic performance of rotor system. In this paper, a rigid rotor model is established considering both lateral and pitching vibration under different imbalance excitations to evaluate the effect of air entrainment on rotor system. Tests with three different imbalances are carried out on a rotor-SFD apparatus. Volume

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Kusyumov, Sergey, Robert Stepanov, Alexander Kusyumov, Ruslan Mirgazov, and Boris Kritsky. "Modelling of Flow Characteristics of Main Rotor with Elliptical Root Section in Hover Mode." E3S Web of Conferences 446 (2023): 06002. http://dx.doi.org/10.1051/e3sconf/202344606002.

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The modelling of a helicopter main rotor flow field in hover regime is being considered. The aerodynamic and aeroacoustics characteristics of two rotor models with different blade root geometries are compared. The first rotor has the shape of NACA0012 air foil in the root section of the blades. The second rotor model has an elliptic air foil in the root of the rotor blade. The amplitude and temporal characteristics of the aeroacoustics emission in near-field are investigated using Computational Fluid Dynamics (CFD).

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