Modelling the Helicopter Rotor Aerodynamics at Forward Flight With Free Wake Model and Urans Method

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

doi:10.3846/aviation.2020.12714

Cited by 11 publications

(10 citation statements)

References 21 publications

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“…Supply of pump test sample is determined by weight method by the change in the indication of the scales (8). The pressure in the delivery line ( 13) is controlled with the valve (14). The laboratory bench works as follows: the power pump (1), with the possibility of changing the rotation speed through variable speed drive (13), supplies working fluid from the tank (12) to the nozzle (5).…”

Section: Methodsmentioning

confidence: 99%

“…Supply of pump test sample is determined by weight method by the change in the indication of the scales (8). The pressure in the delivery line ( 13) is controlled with the valve (14).…”

Section: Methodsmentioning

confidence: 99%

“…Such technologies also made it possible to create complex compositions from metal and ceramic materials, which are difficult to obtain by other methods [13]. Computer simulation of gas-dynamic processes helps solve complex problems such as selecting the optimal geometry for solid walls in a gas flow at different flow regimes at low velocities and high ones in the flow [14]. A more detailed study of gas flows in channels of different geometry is required since increasing the efficiency of technological processes is inextricably linked to solving many optimization problems [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine

et al. 2021

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This paper presents a scientific development aimed at improving the efficiency of turbomachines through the joint use of rotary-vane and vortex workflows. In the well-known Euler turbine, the rotor flow channels represent a set of curved pipes. The authors propose to consider in more detail the possibilities of using such rotating pipes in the implementation of an ejection (vortex) workflow. A hybrid pump was considered with the conclusion that its workflow can be described using two Euler equations. The results of computer simulation indicate that hybrid turbomachines are promising. The use of additive technology allowed the creation of micromodels of the Euler turbine with various rotor designs. Laboratory hydraulic tests showed that the liquid inlet to the rotor is possible in pulse mode. Laboratory tests of micromodels using compressed air showed that gas (or liquid) motion through curved pipes could be carried out from the rotor periphery to its center and then back, albeit through another curved pipe. The research results demonstrated that the scientific and technical potential of the Euler turbine is not yet fully unlocked, and research in this direction should continue. The study results are applicable in various industries including the energyeconomy, robotics, aviation, and water transport industries.

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Section: Methodsmentioning

confidence: 99%

“…Supply of pump test sample is determined by weight method by the change in the indication of the scales (8). The pressure in the delivery line ( 13) is controlled with the valve (14).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine

et al. 2021

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“…As the research result shows, in the range of values μ = 0.05-0.1, these "supervortexes" have the highest power. This issue has been previously investigated by the authors (Ignatkin et al, 2018) [2], 2020 [3]). The main rotor wake has an even more complex structure at low speeds (or in hover under wind conditions) in ground effect.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Main Rotor Wake Structures and Induced Velocity Fields at the Tail Rotor Location When Flying Near the Ground

Ignatkin

Makeev

Shomov

et al. 2021

IREASE

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The distance from the rotor's hub to the ground surface in the range of H = 6-16 m and the values of free stream (flight) velocity in the range of V = 0-15 m/s are considered. The results of the visualization for both rotor wake shapes and streamlines are obtained. The influence of the ground proximity on the rotor wake shape, including the formation of "supervortex" and "ground vortex" structures are analyzed. The induced velocity fields of the main rotor in the area of the tail rotor location for various azimuth positions relative to the main rotor axis are studied. The conclusion is made about the significant influence of the ground effect on the rotor wake structure and induced velocities field, including the area of the tail rotor location. Particularly, at slip flight with speed V = 10 m/s, when the distance to the ground surface H increases from 6 to 12 m, the value of the average induced velocity at the tail rotor plane is growing up to four times. The obtained data have allowed taking into account such effects of aerodynamic interference in the simplified mathematical model of the research flight simulator of JSC Helicopters Mil and Kamov.

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“…In this regard, research of gas-dynamic and hydrodynamic processes in channels with mesh structure can be fully attributed to the number of relevant works. In aviation engineering, many problems regarding selecting the optimal geometry for solid walls in the gas flow at different flowing regimes, at high speeds [15,16] and low speeds, have been solved [17,18].…”

mentioning

confidence: 99%

Development and Prototyping of Jet Systems for Advanced Turbomachinery with Mesh Rotor

et al. 2021

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This article presents the research results that aim to develop promising mesh turbomachines equipped with jet control systems. The turbomachines operating in difficult conditions in oil and gas production are mainly considered. At the same time, some research results can be used in other production branches, including power engineering and transport. Three-dimensional models for computer simulation of net turbines and jet control systems were developed. Prototypes and micromodels were created to test the performance of mesh turbines and jet control systems using additive technologies. A methodological approach is proposed to create a classification of jet control systems considering their design and technological features. In the course of numerical experiments, the extreme conditions of fluid and gas outflow through a nozzle equipped with a velocity vector control system, in the control range of adjustment of the velocity vector deflection angle from + 90o to -90o within a geometric hemisphere, have been considered for the first time. It was also shown that when using a dual-channel nozzle, there are possibilities to adjust the velocity vector angle (thrust vector) in the range of + 180o to -180owithin the geometric sphere. Compared with the known variants, the control range of the velocity vector angle is increased by nine times. These calculated data are presented in addition to the previously published results of physical laboratory experiments. Preliminary results of numerical experiments show the possibility of creating a new theory in the field of mesh turbines and jet systems. Patents support the novelty of the developed technical solutions. Doi: 10.28991/esj-2021-01311 Full Text: PDF

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Modelling the Helicopter Rotor Aerodynamics at Forward Flight With Free Wake Model and Urans Method

Cited by 11 publications

References 21 publications

Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine

Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine

Numerical Study of the Main Rotor Wake Structures and Induced Velocity Fields at the Tail Rotor Location When Flying Near the Ground

Development and Prototyping of Jet Systems for Advanced Turbomachinery with Mesh Rotor

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