INCREASING THE RANGE OF STABLE OPERATION OF CENTRIFUGAL COMPRESSOR STAGE WITH A VANELESS DIFFUSER
Centrifugal compressors often operate at different capacities, so it is important to ensure their stable operation over a wide flow range. Stages with vaneless diffusers have several advantages compared to stages with other types of diffusers: they are more technologically advanced to manufacture, a...
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| Format: | Article |
| Language: | English |
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National Aerospace University «Kharkiv Aviation Institute»
2019-12-01
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| Series: | Авіаційно-космічна техніка та технологія |
| Subjects: | |
| Online Access: | http://nti.khai.edu/ojs/index.php/aktt/article/view/984 |
| _version_ | 1797728573665050624 |
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| author | Микола Васильович Калінкевич Микола Іванович Радченко |
| author_facet | Микола Васильович Калінкевич Микола Іванович Радченко |
| author_sort | Микола Васильович Калінкевич |
| collection | DOAJ |
| description | Centrifugal compressors often operate at different capacities, so it is important to ensure their stable operation over a wide flow range. Stages with vaneless diffusers have several advantages compared to stages with other types of diffusers: they are more technologically advanced to manufacture, and more uniform pressure distribution behind the impeller improves the dynamics of the rotor. At low flows, due to the occurrence of a rotating stall and surge, the efficiency of stages with vaneless diffusers rapidly decreases. The occurrence of unstable operating modes of centrifugal compressor stages at low flow rates is associated with the appearance of developed backflows in the flow part. To expand the range of stable operation of the stages, it is necessary to use methods of flow separation control. Separation of the flow can be controlled either by special profiling the flow part channels or by actively influencing the flow, for example, by injecting gas. To solve this problem, a mathematical model of the gas flow in a vaneless diffuser with gas injection is developed. The characteristics and parameters of the flow in the vaneless diffusers with various meridional profiles with and without injecting gas were calculated. A comparison of the calculated and experimental characteristics of the vaneless diffusers and flow parameters in diffusers with different geometries and with different injection modes confirms the adequacy of the mathematical model. Investigations have confirmed the possibility of improving the characteristics of the stages of centrifugal compressors through the use of vaneless diffusers and diffusers with gas injection. Gas injection diffusers extend the stable operation range of the stages. The use of gas injection in a vaneless diffuser allows reducing the power consumption during antisurge control in comparison with the widespread bypass suction system at the entrance to the impeller |
| first_indexed | 2024-03-12T11:17:03Z |
| format | Article |
| id | doaj.art-bf9834fa19374d3d97ddd08d5af6f7bb |
| institution | Directory Open Access Journal |
| issn | 1727-7337 2663-2217 |
| language | English |
| last_indexed | 2024-03-12T11:17:03Z |
| publishDate | 2019-12-01 |
| publisher | National Aerospace University «Kharkiv Aviation Institute» |
| record_format | Article |
| series | Авіаційно-космічна техніка та технологія |
| spelling | doaj.art-bf9834fa19374d3d97ddd08d5af6f7bb2023-09-02T01:59:32ZengNational Aerospace University «Kharkiv Aviation Institute»Авіаційно-космічна техніка та технологія1727-73372663-22172019-12-01064910.32620/aktt.2019.6.011026INCREASING THE RANGE OF STABLE OPERATION OF CENTRIFUGAL COMPRESSOR STAGE WITH A VANELESS DIFFUSERМикола Васильович Калінкевич0Микола Іванович Радченко1Сумський державний університет, СумиНаціональний університет кораблебудування ім. адмірала Макарова, МиколаївCentrifugal compressors often operate at different capacities, so it is important to ensure their stable operation over a wide flow range. Stages with vaneless diffusers have several advantages compared to stages with other types of diffusers: they are more technologically advanced to manufacture, and more uniform pressure distribution behind the impeller improves the dynamics of the rotor. At low flows, due to the occurrence of a rotating stall and surge, the efficiency of stages with vaneless diffusers rapidly decreases. The occurrence of unstable operating modes of centrifugal compressor stages at low flow rates is associated with the appearance of developed backflows in the flow part. To expand the range of stable operation of the stages, it is necessary to use methods of flow separation control. Separation of the flow can be controlled either by special profiling the flow part channels or by actively influencing the flow, for example, by injecting gas. To solve this problem, a mathematical model of the gas flow in a vaneless diffuser with gas injection is developed. The characteristics and parameters of the flow in the vaneless diffusers with various meridional profiles with and without injecting gas were calculated. A comparison of the calculated and experimental characteristics of the vaneless diffusers and flow parameters in diffusers with different geometries and with different injection modes confirms the adequacy of the mathematical model. Investigations have confirmed the possibility of improving the characteristics of the stages of centrifugal compressors through the use of vaneless diffusers and diffusers with gas injection. Gas injection diffusers extend the stable operation range of the stages. The use of gas injection in a vaneless diffuser allows reducing the power consumption during antisurge control in comparison with the widespread bypass suction system at the entrance to the impellerhttp://nti.khai.edu/ojs/index.php/aktt/article/view/984відцентровий компресорбезлопатковий дифузорпомпаждослідження |
| spellingShingle | Микола Васильович Калінкевич Микола Іванович Радченко INCREASING THE RANGE OF STABLE OPERATION OF CENTRIFUGAL COMPRESSOR STAGE WITH A VANELESS DIFFUSER Авіаційно-космічна техніка та технологія відцентровий компресор безлопатковий дифузор помпаж дослідження |
| title | INCREASING THE RANGE OF STABLE OPERATION OF CENTRIFUGAL COMPRESSOR STAGE WITH A VANELESS DIFFUSER |
| title_full | INCREASING THE RANGE OF STABLE OPERATION OF CENTRIFUGAL COMPRESSOR STAGE WITH A VANELESS DIFFUSER |
| title_fullStr | INCREASING THE RANGE OF STABLE OPERATION OF CENTRIFUGAL COMPRESSOR STAGE WITH A VANELESS DIFFUSER |
| title_full_unstemmed | INCREASING THE RANGE OF STABLE OPERATION OF CENTRIFUGAL COMPRESSOR STAGE WITH A VANELESS DIFFUSER |
| title_short | INCREASING THE RANGE OF STABLE OPERATION OF CENTRIFUGAL COMPRESSOR STAGE WITH A VANELESS DIFFUSER |
| title_sort | increasing the range of stable operation of centrifugal compressor stage with a vaneless diffuser |
| topic | відцентровий компресор безлопатковий дифузор помпаж дослідження |
| url | http://nti.khai.edu/ojs/index.php/aktt/article/view/984 |
| work_keys_str_mv | AT mikolavasilʹovičkalínkevič increasingtherangeofstableoperationofcentrifugalcompressorstagewithavanelessdiffuser AT mikolaívanovičradčenko increasingtherangeofstableoperationofcentrifugalcompressorstagewithavanelessdiffuser |