Vol 9, No 4 (2023): 30.12.2023

In December 2023, at the age of 85, Academician Vladimir Pavlovich Shorin, an outstanding scientific and public figure who played a key role in the creation of the Russian Academy of Sciences in the 90s and restoring the importance of education in the country, passed away. The words of Academician A.N. Krylov apply to the scientific activity of V.P. Shorin like nothing else: “We must remember that the costs of truly scientific creativity are then repaid in the life of the state not by a sevenfold, not a hundredfold, but by numbers for which there were no names in the ancient language.” Vladimir Shorin’s entire life was devoted to serving science, creating a new scientific school and new scientific directions. Having defended his doctoral dissertation and become a professor, he created a new educational department at the Kuibyshev Aviation Institute in the early 80s, which for a long time trained specialists in the field of automatic control of aircraft engines and laser technologies. After recent educational reforms, his department, already at Samara University, continues to train bachelors and masters in the field of production automation and robotics, which are in demand at enterprises in the region and throughout the country. Under his scientific leadership, several dozen of his followers defended their candidate and doctoral dissertations and earned academic titles. The scientific heritage of Vladimir Shorin includes dozens of books, several hundred scientific articles and dozens of patents. The Motherland highly appreciated the role of Vladimir Shorin in the creation of a scientific school, the leadership of science, his activities as a deputy in the country's legislative body, and the training of engineering and scientific personnel. Possessing high human qualities, Vladimir Shorin was the center of attraction for his employees and friends. He valued family ties very highly. He honored the memory of his parents and deceased brothers. The scientific community of the country, paying tribute to the memory of V.P. Shorin, continues to comprehend and develop his ideas. Life has shown that the scientific and engineering works of Academician Vladimir Pavlovich Shorin have received extremely wide application in practice and have given rise to the creation and development of new scientific directions.

This paper presents a new method for calculating leaks of an end gas dynamic seal with spiral grooves in various modes of operation of an aircraft engine. This type of seal has never been used in the design of aircraft engines, however, it has good characteristics in comparison with traditional types of seals. In the developed methodology, the effect of changing the engine operating mode on temperature loads and deformations is investigated. The simulation results are compared with experimental data.

The results of an experimental study of the normal flame propagation speed of a hydrogen-enriched and/or water vapor-diluted methane-air mixture at atmospheric pressure and initial mixture temperatures of 300 and 330 K are presented in this paper. The normal flame propagation speed was determined by the zero heat flow method (Heat Flux). The obtained experimental data were compared with the results of numerical simulation of adiabatic premixed laminar flames, which was carried out using three kinetic mechanisms of the methane-hydrogen fuels oxidation. The flame speed increased proportionally up to 35% when the methane was enriched with hydrogen up to 35% by volume. With increasing vapor concentration, a linear decrease in the flame speed of the methane-air mixture was observed. This decrease does not depend on the degree of hydrogen enrichment. Recommendations are proposed for the use of kinetic mechanisms to simulate the flame of a methane-air mixture when it is enriched with hydrogen and diluted with water vapor.

A hydraulic drive with magnetorheological control is an effective solution when it is necessary to ensure precise positioning of a massive object. The magnetorheological drive is capable of positioning an object weighing up to 100 kg with an error of up to 50 nm. The dynamic characteristics of the working fluid flow in various sections of the pipeline determine the technical characteristics of the device as a whole.

In this paper, the hydraulic characteristics of the drive are studied by the finite element method under laminar flow conditions. A study of the pressure at the inlet and outlet of the magnetorheological throttle showed that the pressure drop ranges from 8.2 kPa to 26.2 kPa, depending on the pressure at the inlet of the hydraulic system and the location of the throttle. The fluid flow velocity in the technological gap was 1 m/s in the center of the channel and allows us to evaluate the behavior of the drive at various operating pressures, as well as subsequently carry out a complete modeling of the system to implement the mechanism control system.