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Numerical and experimental investigation of the tone noise of the turbofan first booster stage at different operational conditions

The results of the numerical and experimental investigation of the tone noise of the first booster stage of the high bypass ratio turbofan for two operational conditions N = 53,9% and N = 75,5% are presented. The investigation was performed using the numerical method of multistage turbomachines tone noise simulation, developed in CIAM and implemented in the 3DAS in-house solver. The results of the computation were compared with the experimental data obtained in the CIAM acoustic test facility. The aim was to perform validation of the computational method and also to investigate the mechanisms of tone noise generation in multistage turbomachine. In general satisfactory correspondence between calculation and experiment was obtained. It was found out, that in general the sound power of acoustic radiation through an inlet at operational conditions N = 75,5% was higher than at operational conditions N = 53,9%, however it was distributed through larger number of tones, and as a result, the powers of the strongest tones were comparable with those at N = 53,9% conditions

Keywords: fan, booster stage, multistage turbomachine, tone noise, computational aeroacoustic, frequency domain methods.

Rossikhin A.A., Pankov S.V., Mileshin V.I.

Application of piezoelectric elements for active damping of resonant vibrations of turbomachine blades

Main features of active vibration damping in mechanical systems via piezoelectric elements are presented. One-dimensional analytical models, including those within the wave method of direct mathematical modeling, and three-dimensional finite element models were used for computational recreation of the effect of active piezoelectric damping in turbomachine blades. Results of experimental and computational studies on active piezoelectric damping of forced vibrations in a GTE compressor’s full-scale rotor blade are presented.

Keywords: vibration damping, piezoelectric element, compressor rotor blade.

Shorr B.F., Bortnikov A.D.

Quasi-two-dimensional mathematical model of two-row contra-rotating propfan

A mathematical model (MM) of a single-row propfan and, on its basis, a model of a two-row propfan in a quasitwo-dimensional statement have been developed. The models are based on the method of calculating aerodynamic parameters according to the impulse theory of propellers (the Sabinin – Yuriev theory), the essence of which is taking into account induced velocities using impulses and angular momentum equations. The adequacy of results of mathematical modeling of a single-row propfan is shown by comparing calculation results with experimental aerodynamic characteristics of a model (SR-7A) and a full-size single-row propfan (SR-7L). An adequate transfer of the two-row model propfan test results to operating conditions of propfan engine power plant can be provided with help of the developed mathematical model. Described MM of a two-row propfan is used in integral mathematical models of propfan engines with geared drive and direct drive architecture, developed in CIAM.

Keywords: two-row propfan, induced velocity, aerodynamic airfoil, blade setting angle, propfan aerodynamic performance.

Niskorodnov A.V., Shvetc L.I.

Possibility of using optical methods to measure aerodynamic characteristics in a chamber of an enclosed ground test bench with a high-thrust engine

The PIV method is recommended to measure velocity at inlet of an air intake duct which measures velocities in two longitudinal mutually perpendicular diametrical planes with optical markers supplied in these planes without “sowing” the entire air flow going through the engine. To measure velocity in large-scale flow conditions in a test chamber, a time-of-flight method is proposed based on measuring the time of flight of optical markers that track the flow rate between two laser beams formed in two cross-sections of the chamber at a known distance from each other. The assessment was made regarding possibility of using this method in test bench conditions based on the results of a model experiment. The layout of the measuring system and the design of the device for generating single optical markers, inoculated into the flow and moving in the flow without slipping, are presented

Keywords: test bench, velocity measurement, time-of-flight method.

Aslanyan E.V., Golentsov D.A., Zaharov D.L., Korneev M.V., Loginova A.A.,

Lianzberg J.P., Maslov V.P., Mineev B.I.

Possibilities of wireless sensors application with sensitive elements based on surface acoustic waves during aircraft engines testing

The possibility of using wireless sensors with sensitive elements based on surface acoustic waves (SAW) during testing and operation of aircraft engines is considered. Based on the analysis of publications on this topic, the fundamental possibility of using SAW sensors at high temperatures is shown. The presented results of calculations show the possibility of using langasite substrates to create a high-temperature SAW torque sensor, similar to practically used low-temperature sensors. The results of preliminary studies demonstrate the possibility of creating a wireless SAW vibration strain sensor, which can be used on rotating objects without current collectors.

Keywords: wireless sensor, SAW sensor, high-temperature sensor, torque sensor, vibration strain sensor.

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

Evaluation of fatigue life of products made of composite materials

The paper presents an analysis of fatigue models of composite materials. Based on the probabilistic analysis of the residual strength in fatigue tests, a ratio is obtained that allows to analytically construct S–N curves (fatigue curves) for composite materials based on the results of static strength tests, significantly reducing the time and cost of work. The results of comparing predicted durability with experimental data allow to use analytically constructed S–N curves to estimate fatigue limits of composite materials, which is especially important at preliminary design stages, characterized by insufficient experimental data. An effective method of constructing fatigue curves for different values of the loading cycle asymmetry ratio using the Goodman diagram is proposed.

Keywords: composite materials, fatigue strength, durability, failure probability, loading cycles, load asymmetry, stress distribution, S–N curves, Goodman diagram.

Karimbaev T.D.