Investigation of gas flow with injection in vaneless diffuser of centrifugal compressor

Kalinkevych, Mykola Vasylovych; Shcherbakov, Oleg; Ihnatenko, V.

doi:10.1533/9781782421702.9.501

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…Згідно з [1] Отже, для розширення діапазону стійкої роботи та для підвищення ефективності роботи ступенів відцентрових компресорів при малих витратах доцільно використовувати методи керування відривом потоку. Перспективними способами розширення діапазону стійкої роботи ступенів ВК з БЛД є застосування ступінчастих дифузорів, а також вдування газу в БЛД [4,5,7].…”

Section: аналіз проблеми і постановка мети дослідженняunclassified

Збільшення Діапазону Стійкої Роботи Ступеня Відцентрового Компресора З Безлопатковим Дифузором

Калінкевич¹,

Радченко²

2019

aktt

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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

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Section: аналіз проблеми і постановка мети дослідженняunclassified

Збільшення Діапазону Стійкої Роботи Ступеня Відцентрового Компресора З Безлопатковим Дифузором

Калінкевич¹,

Радченко²

2019

aktt

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“…The detailed description of the test system and procedure was given by Kalinkevych and Shcherbakov [13].…”

Section: (A) Diffuser Width Ratio Ismentioning

confidence: 99%

Numerical Modeling of the Flow in a Vaneless Diffuser of Centrifugal Compressor Stage

Kalinkevych

Shcherbakov

2013

ISRN Mechanical Engineering

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This paper presents the results of numerical investigation of the flow in a vaneless diffuser of centrifugal compressor stage. Simulations were performed using both a commercial CFD package ANSYS CFX and the own-designed computer program. Steady conditions involving SST turbulence model were used for the calculations using CFX. To consider the interaction between impeller and diffuser, not just a diffuser but the whole stage was calculated. The own-designed methodology is based on solving of conservation equations with assumptions that flow in a diffuser is steady state and axisymmetric. The flow area is divided into the flow core and boundary layers. Results of calculation were compared with experimental data.

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Investigation of gas flow with injection in vaneless diffuser of centrifugal compressor

Cited by 2 publications

References 10 publications

Збільшення Діапазону Стійкої Роботи Ступеня Відцентрового Компресора З Безлопатковим Дифузором

Збільшення Діапазону Стійкої Роботи Ступеня Відцентрового Компресора З Безлопатковим Дифузором

Numerical Modeling of the Flow in a Vaneless Diffuser of Centrifugal Compressor Stage

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