Alexander Vitalyevich Fedorov
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Alexander Vitalyevich Fedorov has a total of 89 co-authors. Here are the top co-authors by number of shared publications:
- Andrey Vadimovich Novikov
Central Aerohydrodynamic Institute
7 shared publications I. V. Egorov
Department of Aeromechanics and Flight Engineering, Moscow Institute of Physics and Technology, Zhukovsky, 140180, Russia
6 shared publicationsAnatoli Tumin
University of Arizona, Tucson
5 shared publicationsAnatoly Maslov
Russian Academy of Sciences
5 shared publicationsIvan Egorov
TsAGI
5 shared publications- Pavel Vladimirovich Chuvakhov
Moscow Institute of Physics and Technology
5 shared publications
Latest Publications
- 18 March 2025
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 1007, A27
Statistical model of laminar–turbulent transition onset caused by atmospheric particulates
Within the frameworks of the amplitude method and the linear stability theory, a statistical model of the initial stage of laminar–turbulent transition caused by atmospheric particulates (aerosols) penetrating into the boundary layer is developed. The model accounts for the process of boundary layer receptivity to particulates, asymptotic behaviour of unstable wave packets propagating downstream from particle–wall collisions and the amplitude criterion for the transition onset. The resulting analytical relationships can be used for quick predictions of the transition onset on bodies of relatively simple shape, where the undisturbed boundary layer is quasi-two-dimensional. The model allows us to explore the transition onset at realistic distributions of the particle concentration selected based on an analysis of known empirical data. As an example, a 14° half-angle sharp wedge flying in atmosphere at 20 km altitude and Mach number 4 is considered. It is shown that the transition onset corresponds to an N-factor of 15.3 for a flight under normal atmospheric conditions and 12.2 for a flight in a cloud after volcanic eruption. In accordance with physical restrictions, these values are below the upper limit $N\approx 16.8$ predicted for transition due to thermal fluctuations (perfectly ‘clean’ case). Nevertheless, they are significantly greater than $N=10$ which is commonly recommended for estimates of the transition onset in flight.- 18 March 2025
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 1007, A27
Statistical model of laminar–turbulent transition onset caused by atmospheric particulates
Within the frameworks of the amplitude method and the linear stability theory, a statistical model of the initial stage of laminar–turbulent transition caused by atmospheric particulates (aerosols) penetrating into the boundary layer is developed. The model accounts for the process of boundary layer receptivity to particulates, asymptotic behaviour of unstable wave packets propagating downstream from particle–wall collisions and the amplitude criterion for the transition onset. The resulting analytical relationships can be used for quick predictions of the transition onset on bodies of relatively simple shape, where the undisturbed boundary layer is quasi-two-dimensional. The model allows us to explore the transition onset at realistic distributions of the particle concentration selected based on an analysis of known empirical data. As an example, a 14° half-angle sharp wedge flying in atmosphere at 20 km altitude and Mach number 4 is considered. It is shown that the transition onset corresponds to an N-factor of 15.3 for a flight under normal atmospheric conditions and 12.2 for a flight in a cloud after volcanic eruption. In accordance with physical restrictions, these values are below the upper limit $N\approx 16.8$ predicted for transition due to thermal fluctuations (perfectly ‘clean’ case). Nevertheless, they are significantly greater than $N=10$ which is commonly recommended for estimates of the transition onset in flight.- Open Access
- 10 May 2024
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 986, E1
Numerical modelling of supersonic boundary-layer receptivity to solid particulates – CORRIGENDUM
- 10 May 2024
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 986, E1
Open AccessNumerical modelling of supersonic boundary-layer receptivity to solid particulates – CORRIGENDUM
- 15 January 2024
- Published by Elsevier in Computers & Fluids
- Vol. 271
Asymptotic boundary condition for numerical modeling of wave packets in a supersonic boundary layer
- 15 January 2024
- Published by Elsevier in Computers & Fluids
- Vol. 271
Asymptotic boundary condition for numerical modeling of wave packets in a supersonic boundary layer
- 9 June 2023
- Published by Springer Nature in Theoretical and Computational Fluid Dynamics
- Vol. 37 (5) , 549-558
Receptivity of high-speed boundary layer on a flat plate at angles of attack: entropy and vorticity waves
- 9 June 2023
- Published by Springer Nature in Theoretical and Computational Fluid Dynamics
- Vol. 37 (5) , 549-558
Receptivity of high-speed boundary layer on a flat plate at angles of attack: entropy and vorticity waves
- 1 April 2023
- Published by Springer Nature in Theoretical and Computational Fluid Dynamics
- Vol. 37 (2) , 261-268
Stabilization of crossflow mode by grooves on a supersonic swept wing
- 1 April 2023
- Published by Springer Nature in Theoretical and Computational Fluid Dynamics
- Vol. 37 (2) , 261-268
Stabilization of crossflow mode by grooves on a supersonic swept wing
- 30 August 2022
- Published by Springer Nature in Theoretical and Computational Fluid Dynamics
- Vol. 36 (5) , 705-722
Acoustic receptivity of high-speed boundary layers on a flat plate at angles of attack
- 30 August 2022
- Published by Springer Nature in Theoretical and Computational Fluid Dynamics
- Vol. 36 (5) , 705-722
Acoustic receptivity of high-speed boundary layers on a flat plate at angles of attack
- 23 December 2021
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 933
Instability of the attachment line boundary layer in a supersonic swept flow
Theoretical analysis of attachment-line instabilities is performed for supersonic swept flows using the compressible Hiemenz approximation for the mean flow and the successive approximation procedures for disturbances. The theoretical model captures the dominant attachment-line modes in wide ranges of the sweep Mach number ${M_e}$ and the wall temperature ratio. It is shown that these modes behave similar to the first and second Mack modes in the boundary layer flow. This similarity allows us to extrapolate the knowledge gained for Mack modes to the attachment-line instabilities. In particular, we find that at sufficiently large ${M_e}$ , the dominant attachment-line instability is associated with the synchronisation of slow and fast modes of acoustic nature. Point-by-point comparisons of the theoretical predictions with the experiments of Gaillard et al. (Exp. Fluids, vol. 26, 1999, pp. 169–176) demonstrate that at ${M_e} > 4$ , the theory captures a significant drop of the transition onset Reynolds number, which is below the contamination criterion of Poll $({R_\mathrm{\ast }} = 250)$ at ${M_e} > 6$ . This contradicts the generally accepted assumption that the attachment-line flow is stable for ${R_\mathrm{\ast }} \le 250$ . The theoretical critical Reynolds numbers lie well below the experimental transition-onset Reynolds numbers. Stability computations using the Navier–Stokes mean flow and accounting for the leading-edge curvature effect do not eliminate this discrepancy. Most likely, in the experiments of Gaillard et al., we face with an unknown effect that does not fit to the concept of transition arising from linear instability.- 23 December 2021
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 933
Instability of the attachment line boundary layer in a supersonic swept flow
Theoretical analysis of attachment-line instabilities is performed for supersonic swept flows using the compressible Hiemenz approximation for the mean flow and the successive approximation procedures for disturbances. The theoretical model captures the dominant attachment-line modes in wide ranges of the sweep Mach number ${M_e}$ and the wall temperature ratio. It is shown that these modes behave similar to the first and second Mack modes in the boundary layer flow. This similarity allows us to extrapolate the knowledge gained for Mack modes to the attachment-line instabilities. In particular, we find that at sufficiently large ${M_e}$ , the dominant attachment-line instability is associated with the synchronisation of slow and fast modes of acoustic nature. Point-by-point comparisons of the theoretical predictions with the experiments of Gaillard et al. (Exp. Fluids, vol. 26, 1999, pp. 169–176) demonstrate that at ${M_e} > 4$ , the theory captures a significant drop of the transition onset Reynolds number, which is below the contamination criterion of Poll $({R_\mathrm{\ast }} = 250)$ at ${M_e} > 6$ . This contradicts the generally accepted assumption that the attachment-line flow is stable for ${R_\mathrm{\ast }} \le 250$ . The theoretical critical Reynolds numbers lie well below the experimental transition-onset Reynolds numbers. Stability computations using the Navier–Stokes mean flow and accounting for the leading-edge curvature effect do not eliminate this discrepancy. Most likely, in the experiments of Gaillard et al., we face with an unknown effect that does not fit to the concept of transition arising from linear instability.- 27 June 2021
- Published by Springer Nature in Theoretical and Computational Fluid Dynamics
- Vol. 36 (1) , 9-24
The Mack’s amplitude method revisited
- 27 June 2021
- Published by Springer Nature in Theoretical and Computational Fluid Dynamics
- Vol. 36 (1) , 9-24
The Mack’s amplitude method revisited
- 1 January 2021
- Published by AIP Publishing in AIP Conference Proceedings
- Vol. 2412 (1) , 030036
The research of processes in compressed air drying units using composite adsorption materials
The presence of condensate in heat medium and gases leads to a deterioration in the operating conditions of units and automation systems. This leads to the equipment downtime and emergencies, as well as to the decrease in the quality of various technological processes in the machine-building, metallurgical, food, chemical, medical, gas and oil industries, transport [1], [5], [6], [8], [10]. To eliminate the probability of entering the condensate into the pneumatic systems of vehicles, adsorbing compressed air dryers are used. They must provide a decrease of the dew point temperature relative to the ambient temperature from 20°C to 40°C, in a wide temperature range of equipment operation (from minus 50°C to plus 65°C) during their entire service life with their compact placement on a vehicle. However, many current dryers do not fulfil the specified requirements, which poses the challenge for researchers to develop new technical solutions [4]. Intensive usage of adsorption materials in transport systems places high demands on their performance characteristics. They are: high strength, the possibility of placement in structures of complex configuration, the absence of abrasion, which are characteristic disadvantages of the operation of granular adsorbents [7]. The usage of composite adsorption materials (CAM) with the characteristics being purposefully controlled during their manufacturing process, makes it possible to eliminate the disadvantages of granular adsorbents and to create a wide range of competitive adsorption materials for their use in transport, providing the required dew point temperature. This paper represents the results of experimental studies of compressed air drying processes in transport adsorption plants with composite adsorption materials in the form of monoblocks (MA) and tubular adsorbent (TA) [2], [3]. The values of the decrease in the temperature of the dew point of compressed air relative to the ambient temperature, as well as the values of the hydraulic resistance of the layer of the composite adsorption material, have been determined. The dependence of the values of the dew point temperature on the value of the air consumption for the regeneration of the adsorbent is represented.
- 1 January 2021
- Published by AIP Publishing in AIP Conference Proceedings
- Vol. 2412 (1) , 030036
The research of processes in compressed air drying units using composite adsorption materials
The presence of condensate in heat medium and gases leads to a deterioration in the operating conditions of units and automation systems. This leads to the equipment downtime and emergencies, as well as to the decrease in the quality of various technological processes in the machine-building, metallurgical, food, chemical, medical, gas and oil industries, transport [1], [5], [6], [8], [10]. To eliminate the probability of entering the condensate into the pneumatic systems of vehicles, adsorbing compressed air dryers are used. They must provide a decrease of the dew point temperature relative to the ambient temperature from 20°C to 40°C, in a wide temperature range of equipment operation (from minus 50°C to plus 65°C) during their entire service life with their compact placement on a vehicle. However, many current dryers do not fulfil the specified requirements, which poses the challenge for researchers to develop new technical solutions [4]. Intensive usage of adsorption materials in transport systems places high demands on their performance characteristics. They are: high strength, the possibility of placement in structures of complex configuration, the absence of abrasion, which are characteristic disadvantages of the operation of granular adsorbents [7]. The usage of composite adsorption materials (CAM) with the characteristics being purposefully controlled during their manufacturing process, makes it possible to eliminate the disadvantages of granular adsorbents and to create a wide range of competitive adsorption materials for their use in transport, providing the required dew point temperature. This paper represents the results of experimental studies of compressed air drying processes in transport adsorption plants with composite adsorption materials in the form of monoblocks (MA) and tubular adsorbent (TA) [2], [3]. The values of the decrease in the temperature of the dew point of compressed air relative to the ambient temperature, as well as the values of the hydraulic resistance of the layer of the composite adsorption material, have been determined. The dependence of the values of the dew point temperature on the value of the air consumption for the regeneration of the adsorbent is represented.