Numerical investigation of full scale coaxial main rotor aerodynamics in hover and vertical descent

Makeev, P. V.; Ignatkin, Yuri Mikhailovich; Shomov, A. I.

doi:10.1016/j.cja.2020.12.011

Cited by 13 publications

(23 citation statements)

References 16 publications

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“…The presented results continue the research published earlier by the authors [29] and which is dedicated to the numerical modeling of the VRS modes of the Kamov Ka-32 helicopter full-scale coaxial rotor in the hover and vertical descent modes (α R = 90 • ). In the proposed study, the simulation of steep descent modes with different angles of attack of the rotor α R = 70, 50 and 30 • has been performed.…”

Section: Introductionsupporting

confidence: 86%

“…In the proposed study, the simulation of steep descent modes with different angles of attack of the rotor α R = 70, 50 and 30 • has been performed. Together with the results of [29], this made it possible to conduct a comprehensive analysis of the coaxial rotor aerodynamics in the VRS modes and receive their boundaries in the "V x -V y " coordinates using various criteria.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Coaxial Main Rotor Aerodynamics in Steep Descent

2022

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Numerical studies of the aerodynamic characteristics of the coaxial main rotor of the Kamov Ka-32 helicopter in steep descent modes, including the area of the vortex ring state (VRS) modes, have been performed. Used in this paper is an original free vortex wake model of the rotor developed by the authors. The angles of attack of the rotor αR = 30 – 90° and the rate of descent in the range of Vy = 0–30 m/s are considered. The calculations have been carried out under the condition of a fixed time-average thrust of the rotor. The visualization of the rotor wake shapes the flow structures using streamlines, and the flow velocities have been received and analyzed. The VRS boundaries in “Vx–Vy” coordinates have been constructed. The criteria used in this paper are: rotor thrust and torque pulsations, rise of rotor torque and induced velocity relative to the hovering mode. The results of the calculations are compared with the experimental and calculated data of other authors, and a satisfactory match has been obtained. The new results presented in this paper can supplement the existing experience of experimental and numerical research in this field.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Numerical Study of Coaxial Main Rotor Aerodynamics in Steep Descent

2022

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“…e concentration of particulate matter can be calculated by calculating the ratio of the light intensity before and after the laser passes through the flue gas. Land-4200 of foreign Land Company and LDM-100 of domestic Concentrating Technology are all made use of this method [6]. e method is easy to understand and simple in structure, but it has the following shortcomings: low sensitivity, easy to be affected by changes in particle size distribution and refraction coefficient, and the bad measurement effect.…”

Section: Extinction Methodmentioning

confidence: 99%

Detection of Particle Concentration and Particle Size Based on Aerodynamic Particle Size Spectrometer

Zhang

Hou

2022

Advances in Multimedia

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In order to solve the problem of the continuous online monitoring of the fixed pollution source emission particles, on the basis of the advantages and disadvantages of the comprehensive analysis of the extinction method, the β-ray absorption method, the micro-oscillating balance method, the charge transfer method, and the light scattering method, the particle size distribution and concentration optical detection system based on aerodynamic particle size spectrometer is designed according to the Mie light scattering principle. A high-performance aerodynamic particle size spectrometer is designed using a single-wavelength method to measure the concentration of particulate matter, and the equipment and the detection system are used in the continuous monitoring of particulate matter emitted by thermal power plants and compared with the ES632 equipment. Through the system test, the results show that compared with the ES632 equipment performance, the lowest concentration measured by the design of aerodynamic particle size spectrometer equipment can reach 0.1 mg/m3 with a measurement accuracy of 0.01 mg/m3. Compared with the ES632 equipment, the measurement concentration value is 8% higher, which meets the test requirements.

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“…Here it is used an approach that allows determining the vorticity field from the vortex segment and the induced velocity from this vorticity field on the basis of an exact solution of the vortex source diffusion. The model with its basic equations is described in detail in works [23], [25].…”

Section: Ii1 Free Wake Model Of a Rotormentioning

confidence: 99%

“…The original free wake model used in the presented work has been developed at Moscow Aviation Institute [23] by the authors. Previously, this model has been applied in study of the aerodynamic characteristics of conventional [24] and coaxial [25] rotors in the hover state and VRS modes. In these works, the model has been validated by comparing the results of calculations with experimental and calculated data of the other authors.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of 3-Bladed and Sсissors Tail Rotors Aerodynamics in Axial Flow

Makeev

Ignatkin

Shomov

et al. 2022

IREASE

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The paper is focused on the numerical study of the aerodynamic characteristics of 3bladed and scissors tail rotors used on Mi-8/17 series helicopters. The hovering and axial flow modes, including the Vortex Ring State (VRS) area are considered. The free wake model developed by authors is used in the research. The study has been performed for two approaches: with a fixed blade pitch angle and with a fixed time-average thrust value. The dependences of the rotor thrust and torque coefficients vs. axial flow velocity and vs. number of revolutions of a rotor have been obtained. The vortex wake shapes and flow images via streamlines have been analyzed. The comparative analysis of the results has been performed. Scissors rotor demonstrates better aerodynamic characteristics in comparison with 3-bladed rotor. Among them: increased hovering efficiency, lower level of thrust and torque pulsations in the VRS modes, smaller power consumption while constant thrust. The authors came to the conclusion about the greater efficiency of the aerodynamic design of scissors tail rotor compared to 3-bladed rotor both in hover and in the VRS modes area.

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Numerical investigation of full scale coaxial main rotor aerodynamics in hover and vertical descent

Cited by 13 publications

References 16 publications

Numerical Study of Coaxial Main Rotor Aerodynamics in Steep Descent

Numerical Study of Coaxial Main Rotor Aerodynamics in Steep Descent

Detection of Particle Concentration and Particle Size Based on Aerodynamic Particle Size Spectrometer

Comparative Study of 3-Bladed and Sсissors Tail Rotors Aerodynamics in Axial Flow

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