Browsing by Author "Doroshenko, Ekaterina"

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    Numerical study of flow in the stage of an axial compressor with different topology of computational grid
    (National Technical University "Kharkiv Polytechnic Institute", 2017) Tereshchenko, Yuriy; Терещенко, Юрій Юрійович; Doroshenko, Ekaterina; Дорошенко, Екатерина Вікторівна; Lastivka, Ivan; Ластівка, Іван Олексійович; Tereshchenko, Yuriy; Терещенко, Юрій Матвійович
    We conducted a series of calculations with the models of turbulent viscosity k–e, SST and three variants of three-dimensional unstructured computational grids. For each variant of the computational grid we calculated each of the two models of turbulent viscosity at axial velocity at input from 110 to 150 m/s. Comparison of results of numerical experiments with data of the physical experimental studies revealed that an error of the computational research is 0.3...8.6 %. Results of the study showed that at the first phase of calculation of the stage of an axial compressor one can recommend using the model of turbulent viscosity k–e and the coarse computational grid. To solve the problems on internal aerodynamics of compressors taking into account the flow in the near-border layer and aerodynamic trail, it is expedient to employ the model of turbulent viscosity SST and the fine adaptive grid.
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    Research into aero acoustic characteristics of two-row impellers of the axial compressor
    (Національний технічний університет «Харківський політехнічний інститут», 2018) Doroshenko, Ekaterina; Дорошенко, Катерина Вікторівна; Tereshchenko, Yuriy; Терещенко, Юрій Юрійович; Lastivka, Ivan; Ластівка, Іван Олексійович; Kudzinovs'ka, Inna; Кудзіновська, Інна Павлівна
    We have conducted numerical simulation of current in the axial impellers with a single-row and a two-row geometrically equivalent blade crowns with a density of blade crowns over average radius of 1...2.5. The pressure characteristics of impellers obtained at q(λ)=0.45…0.8 show that using the two-row impellers can improve the pressure of a stage over the entire range of operation. Under the flow-around modes that correspond to the maximum pressure, the degree of pressure rise increases by 10.5 %. The research results showed that the two-row impellers demonstrate the higher level of losses compared with the level of losses in the equivalent single-row impellers. We have obtained results of research into aero acoustic characteristics of subsonic two-row impellers of the axial compressor. The research results showed that the use of two-row blade crowns in the impeller makes it possible to reduce the level of acoustic pressure in the range of operation q(λ)=0.45…0.8 by 0.5 dB to 3.2 dB at a density of blade crowns over average radius of 1...2.5. The replacement of a single-row blade crown in the impeller of a stage of the axial compressor with the equivalent two-row blade crown could ensure the enhancement of aerodynamic loading on the stage and reduce acoustic emission of the compressor.
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    RESEARCH INTO AERO ACOUSTIC CHARACTERISTICS OF TWO-ROW IMPELLERS OF THE AXIAL COMPRESSOR
    (Eastern-European Journal of Enterprise Technologies ISSN 1729-3774, 2018) Doroshenko, Ekaterina; Tereshchenko, Yuriy; Lastivka, Ivan; Kudzinovs'ka, Inna
    Представлено порівняльну оцінку напір­ них характеристик і рівня втрат повного тиску дозвукових робочих коліс осьового ком­ пресора з однорядними і еквівалентними дво­ рядними лопатковими вінцями. Отримано аероакустичні характеристики дозвукових дворядних робочих коліс. Рівень звукового тиску дозвукових дворядних робочих коліс нижче, ніж рівень звукового тиску одноряд­ них робочих коліс на 0,5…3,2 дБ при густо­ ті лопаткових вінців на середньому радіусі 1…2,5 Представлена сравнительная оценка на­ порных характеристик и уровня потерь полного давления дозвуковых рабочих колес осевого компрессора с однорядными и экви­ валентными двухрядными лопаточными венцами. Получены аэроакустичнеские ха­ рактеристики дозвуковых двухрядных рабо­ чих колес. Уровень звукового давления дозву­ ковых двухрядных рабочих колес ниже, чем уровень звукового давления однорядных рабо­ чих колес на 0,5…3,2 дБ при густоте лопа­ точных венцов на среднем радиусе 1…2,5 We have conducted numerical simulation of current in the axial impellers with a single-row and a two-row geometrically equivalent blade crowns with a density of blade crowns over average radius of 1...2.5. The pressure characteristics of impellers obtained at q(λ)=0.45…0.8 show that using the two-row impellers can improve the pressure of a stage over the entire range of operation. Under the flow-around modes that correspond to the maximum pressure, the degree of pressure rise increases by 10.5 %. The research results showed that the two-row impellers demonstrate the higher level of losses compared with the level of losses in the equivalent single-row impellers. We have obtained results of research into aero acoustic characteristics of subsonic two-row impellers of the axial compressor. The research results showed that the use of two-row blade crowns in the impeller makes it possible to reduce the level of acoustic pressure in the range of operation q(λ)=0.45…0.8 by 0.5 dB to 3.2 dB at a density of blade crowns over average radius of 1...2.5. The replacement of a single-row blade crown in the impeller of a stage of the axial compressor with the equivalent two-row blade crown could ensure the enhancement of aerodynamic loading on the stage and reduce acoustic emission of the compressor.