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)

Mathematical modeling of the processes of flow stability disruption in GTE

A description of the mathematical model of GTE is provided, which is used to calculate processes associated with the disruption of flow stability in a non-uniform pressure and temperature field. The use of the developed algorithms in practice offers not only quantitative stability characteristics, but also a theoretical foundation for the development of measures to ensure the engine's stability or operability as part of the aircraft's propulsion system. Research examples of the effectiveness of the GTE adaptive control system influenced by total pressure non-uniformity are given. Some features of the flow stability disruption in the propulsion system influenced by temperature disturbances in the external flow are considered. The effectiveness of engine surge protection is considered in the GTE mathematical model.

Keywords: mathematical modeling, unsteady gas dynamic processes, inertia moment of stages, compressor, turbine, external disturbance

Krasnov S.E.

Review of the abroad works on an application of alternative fuels in aviation

An analysis of works abroad an application of alternative fuels in order to achieve the zero climate impact of aviation is performed. An assessment of the needed amount of electricity produced by renewable energy sources at application of alternative fuels in aviation is presented. A comparison of civil aircraft at the using of synthetic fuel and hydrogen is performed. It is shown that an application of synthetic fuel and hydrogen produced by carbon-neutral technologies allows to reduce CO2 emissions during the life cycle of fuel by 100%. However, by 2050 it is impossible to achieve a carbon-neutral impact of aviation on climate even with the replacement of an all civil fleet on hydrogen. Today there is no other technology technically feasible in terms of the funds and resources that could guarantee such impact of aviation on the climate.

Keywords: aviation, alternative fuel, hydrogen, hydrogen tanks, renewable energy sources, gas turbine engine, environment, climate, propulsion system, cost of ownership, fuel cells, supply chain

Palkin V.A.

Robotic adaptive dimensional polishing of compressor and turbine blades

Technological methods and types of equipment used for automated adaptive dimensional polishing of a gas turbine engine’s blade surfaces are analyzed. The properties of robotic polishing cells, requirements are formulated, the analysis of measuring systems is performed. The model and operational algorithms of automated softwarecontrolled adaptive dimensional polishing are examined. Practical results for the quality of the surface grinding of the blades, including roughness and profile accuracy, are shown. Recommendations for optimizing technological processes are provided.

Mubarakshin R.M., Dicheskul M.D., Nikolaev N.N., Travkin A.A., Mubarakshin M.R.

Evaluation of possibility of integrating one-dimensional numerical computational methods for modeling radial displacements of GTE rotor parts into the mathematical model of active clearance control system

The problem is established to create one-dimensional methods for calculating the thermal state and radial displacements of GTE rotor parts that are not demanding on computational resources for their use in dynamic ACCS based on mathematical modeling. One-dimensional models of the thermal state and radial displacements of a GTE turbine’s disk and blade have been developed. The results of modeling the thermal state and radial displacements of disks and blades of a low-pressure turbine of a ground-based GTU and a high-pressure turbine of an aircraft engine are compared to the results obtained using experimentally validated methods. An assessment was carried out to see if it would be possible to use the developed programs in the ACCS model, which is integrated into the GTE AСCS. The computational memory occupied by the programs and the calculation time of non-stationary processes indicate that they could be used to model the thermal state and radial displacements in real time.

Keywords: thermal state, radial displacements, tip clearance, one-dimensional models, active clearance control system, turbine rotor

Samoylenko N.A., Kashin N.N.

The influence of thermal deformations on clearance in a turbine seal of a liquid rocket engine’s turbopump

Seals are one of the main structural elements of a liquid rocket engine’s turbopump, affecting its performance and efficiency. The effect of thermal deformations on the turbine seal clearance is determined by the cycle diagram of the engine’s operation and used structural materials. A change in the structure’s thermal state causes significant thermal deformations, which affect sealing characteristics and turbine parameters. The article presents the results of computational studies showing that thermal deformations have a significant effect on the clearance in the noncontact turbine sealing of a liquid rocket engine’s turbopump. It is established that when analyzing the influence of thermal deformations, the rate of change in the thermal state of sealing elements and the temperature difference between them must be considered during change in the operating mode.

Keywords: liquid rocket engine, turbopump, turbine, seal, thermal deformation, clearance

Ivanov A.V.

Development of samples and models for determining of defect detectability by eddy current testing when determining and increasing life of critical parts of a GTE

When working on determining and increasing life of critical parts of a GTE, it is required to have data on parameters of performed non-destructive testing and its ability to detect defects. Sizes of defects detected by non-destructive testing in areas of parts for which life is calculated and frequency of inspections are determined based on results of tests and studies of samples, models and parts with defects. The article discusses design and technological features of manufacturing sets of samples and models for determining parameters of defect (crack) detection in critical parts of a GTE by eddy current testing.

Keywords: eddy current testing, detection of defects, samples, models, critical parts of a GTE

Tsykunov N.V., Yakubin S.P.

Assessment of load factors’ impact on performance of aviation piston engine’s crankshaft journal bearings during aerobatic maneuvers

The paper presents analytical models and evaluation methods for the crank mechanism’s performance in the 500 hpV-type gasoline aviation piston engine under effects of high-g conditions and the gyroscopic moment. It is shown that the effect of overloads on the performance of the mechanism is insignificant, using calculation results as an example

Keywords: aviation piston engine, oil film, journal bearing, overload, gyroscopic moment

Kostyuchenkov A.N., Karyakin S.D., Kretinin R.I.

Experimental studies of wireless passive sensors of vibration-induced strain based on surface acoustic waves (SAW) resonators with an optimized interrogation signal

The possibility of measuring vibration-induced fast varying strain using wireless sensors with sensitive elements based on surface acoustic waves (SAW) devices has been proven experimentally. A comparison has been made between the results of measuring vibration-induced strain with a wireless SAW sensor and with a wired sensor based on a strain gauge. Both an active sensor, in which a SAW resonator sets the frequency of an oscillator, and a passive sensor, which does not contain active electronic components and batteries (as part of a sensor located directly on the object), have been tested. Experiments were carried out both with motionless sensors and with wireless sensors placed on rotating objects. The parameters of the interrogation signal that are most suitable for the functioning of a passive vibration-induced strain sensor have been determined, and these sensors have been tested with interrogation by an optimized signal. The SAW sensors that were tested show promise for use in aviation engine testing.

Keywords: wireless sensor, SAW sensor, passive sensor, vibration-induced strain sensor

Shvetsov A.S., Merkulov A.A., Zhgoon S.A., Mineev B.I., Maslov V.P.