METHOD FOR DETERMINATION OF GAS TURBINE ENGINE OPERATIONAL MODES, ON WHICH AXIAL FORCE ON ANGULAR-CONTACT BEARING IS MINIMAL

2017 ◽  
pp. 46-48
Author(s):  
V. V. Posadov ◽  
V. M. Rinarov ◽  
D. A. Slobodskoy
Keyword(s):  
Gas Turbine ◽  
Axial Force ◽  
Gas Turbine Engine ◽  
Turbine Engine ◽  
Operational Modes

scholarly journals Дослідження напруженого стану міжпазових виступів диска робочого колеса компресора з урахуванням впливу відцентрових сил та розладу частот коливань лопаток

2021 ◽  
pp. 47-54
Author(s):  
Анатолій Павлович Зіньковський ◽  
Вячеслав Михайлович Меркулов ◽  
Олег Леонідович Деркач ◽  
Іван Гордійович Токар ◽  
Кирило Валентинович Савченко
Keyword(s):  
Stress State ◽  
Gas Turbine ◽  
Numerical Experiments ◽  
Practical Importance ◽  
Gas Turbine Engine ◽  
Full Scale ◽  
Centrifugal Forces ◽  
Blade Vibration ◽  
Turbine Engine

The authors present the results of the numerical experiments on the determination of the effect of compressor blade mistuning on the stress state of a blade-disk joint under the action of the centrifugal forces and their comparison with results of full-scale experiments. The analysis of the results of the previously performed experimental and numerical experiments on the determination of the possible sources of blade-disk joints failure shows their stress state strongly depends on the disk rim thickness and the blade vibration mode and their mistuning. It indicates the need for further studies to determine the causes of cracks and possible fracture of blade-disk joints in the compressor of a gas-turbine engine. The task is solved in the variation of the dovetail-rim region thickness of the disk of the 1st stage of the low-pressure compressor of the gas-turbine engine D-36, which has blades without shrouds. The finite element models of the blade assembly, are used to perform the investigation. Obtained results of the vibration stress analysis of blade-disk joints in the compressor both modifications under the action of the centrifugal forces have good agreement with the data of full-scale experiments and numerical data using rod models. The presented results of the numerical experiments indicate the possibility of reducing vibration stresses by analyzing and choosing parameters that affect the rigidity of the coupling of the blades, which is of practical importance for increasing the vibration reliability of the compressors of gas-turbine engines.

Determination of Allowable FOD Defects Sizes on the Surface of Gas-Turbine Engine Stator Parts Based on Stress-Concentration Factors

2014 ◽  
Author(s):  
Alexandr Pakhomenkov ◽  
Denis Slobodskoy
Keyword(s):  
Stress Concentration ◽  
Gas Turbine ◽  
Gas Turbine Engine ◽  
Operational Experience ◽  
Foreign Object ◽  
Turbine Engine ◽  
Periodic Inspection ◽  
Concentration Factors ◽  
Stress Concentration Factors

Requirements for reliability and safety of modern aircraft engines are constantly growing [1–2]. Among these requirements is periodic inspection of the engine condition and condition of its individual parts during operation, for the purpose of evaluation of the risk to operation. This is to ascertain possible damage to various engine parts in the course of operation and progressive wear. Damage can occur for a variety of reasons: ingestion of foreign matter in the engine gas path, operation in extreme and off-design conditions, wear, etc. To trace the engine parts condition and detect various damage on the engine parts, periodic inspection is provided. In case of any damage or deviations on parts, the question of their performance and possibility to break during operation are addressed. There are two ways of answering this question: 1 – experimental demonstration of the required strength of parts with damage; 2 – computational demonstration of the required strength of parts with damage. The first way requires a good deal of time and money for carrying out the experiments. It is efficient only with enough operational experience in typical parts with various surface damage. While developing a new engine (having no prototypes) it is more reasonable to use computational methods. To determine the allowable damage of gas-turbine engine parts, a special procedure has been developed. Its main principles consist of the following: - classification of the typical parts damage by foreign object ingestion; - determination of the stress concentration factors (Kt) due to damage for various defect sizes; - determination of strength factors of safety and life for various zones of parts without damage; - determination of Kt values with which minimum allowable values of strength safety factor and life are attained; - determination of allowable sizes of various types of damage for all zones of each part based on previously defined Kt dependencies on typical damage sizes. This methodology is proposed for determination of allowable damage on the surface of gas-turbine engines stator parts caused by foreign object ingestion in order to ensure the required reliability and safety; its experimental verification is foreseen for the future.

DIAGNOSTICS OF INCIPIENT DEFECTS OF GAS TURBINE ENGINE DURING BENCH TESTS

2019 ◽  
pp. 60-64
Author(s):  
V. V. Posadov ◽  
O. L. Posadova ◽  
E. N. Kolesova ◽  
V. V. Kuchin
Keyword(s):  
Gas Turbine ◽  
Vibration Spectrum ◽  
Gas Turbine Engine ◽  
Traditional Methods ◽  
Turbine Engine ◽  
Bench Tests ◽  
Early Stages

The paper describes the determination of useful vibration spectrum components during strength tuning of gas turbine engine by the example of diagnostics of defects of bearing collars. New diagnostics criterion is proposed and used in diagnostics method. The usage of this method allows defining the location of a defect in early stages by transformation of informative diagnostic components of a signal masked by noise in vibration spectrum. Implementation of proposed diagnostics method makes diagnostic components discontinuous (not diffused by frequency). It simplifies the identification of diagnostic components in vibration spectrum in comparison with traditional methods of processing and analysis of dynamic signals.

Sign in / Sign up

Export Citation Format

Share Document