Enhancement of Rotor Loading and Suppression of Stator Separation through Reduction of the Blade–Row Gap
An immersed boundary (IB) method is applied to study the effect of the blade–row gap in a low-speed single-stage compressor. The advantage of using an IB method is that the rotor/stator interface can be eliminated and, thus, the blade–row interaction can be considered at an extremely small gap. The...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-03-01
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| Series: | International Journal of Turbomachinery, Propulsion and Power |
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| Online Access: | https://www.mdpi.com/2504-186X/8/1/6 |
| _version_ | 1827749454808088576 |
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| author | Zhuo Wang Lin Du Xiaofeng Sun |
| author_facet | Zhuo Wang Lin Du Xiaofeng Sun |
| author_sort | Zhuo Wang |
| collection | DOAJ |
| description | An immersed boundary (IB) method is applied to study the effect of the blade–row gap in a low-speed single-stage compressor. The advantage of using an IB method is that the rotor/stator interface can be eliminated and, thus, the blade–row interaction can be considered at an extremely small gap. The IB method was modified to internal-flow problems, and the adaptive mesh refinement (AMR) technique, together with a wall model, used to facilitate the simulations for high Reynolds-number flows. The results showed that both the pressure rise and the efficiency were observed to be higher in the smaller-gap cases. Comparisons between the results of two gaps, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>35</mn><mo>%</mo><msub><mi>c</mi><mi>a</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>3.5</mn><mo>%</mo><msub><mi>c</mi><mi>a</mi></msub></mrow></semantics></math></inline-formula>, are highlighted and further analysis at a specific flow coefficient showed that the increase of the stage performance was contributed to by the enhancement of rotor loading and the suppression to the flow separation of the stator. Correspondingly, the increases of the total pressure rise on the rotor and the stator outlets were observed to be <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.5</mn><mo>%</mo></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>4.3</mn><mo>%</mo></mrow></semantics></math></inline-formula>, respectively. Although the increase on the rotor outlet is much lower than that on the stator outlet, its significance is that a higher level of static pressure is formed near the hub of the gap, which, thus, reduces the adverse pressure gradient of this region in the stator passage. This improvement suppresses the flow separation near the hub of the stator and, thereby, results in a considerable increase to the pressure rise on the stator outlet as a consequence. The effect of the gap on unsteady pressure fluctuation is also presented. |
| first_indexed | 2024-03-11T06:24:23Z |
| format | Article |
| id | doaj.art-c0652968898b46beb233dd34399cf8f1 |
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| language | English |
| last_indexed | 2024-03-11T06:24:23Z |
| publishDate | 2023-03-01 |
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| series | International Journal of Turbomachinery, Propulsion and Power |
| spelling | doaj.art-c0652968898b46beb233dd34399cf8f12023-11-17T11:43:04ZengMDPI AGInternational Journal of Turbomachinery, Propulsion and Power2504-186X2023-03-0181610.3390/ijtpp8010006Enhancement of Rotor Loading and Suppression of Stator Separation through Reduction of the Blade–Row GapZhuo Wang0Lin Du1Xiaofeng Sun2Aeroengine Research Institute, Beihang University, Beijing 100191, ChinaAeroengine Research Institute, Beihang University, Beijing 100191, ChinaSchool of Energy and Power Engineering, Beihang University, Beijing 100191, ChinaAn immersed boundary (IB) method is applied to study the effect of the blade–row gap in a low-speed single-stage compressor. The advantage of using an IB method is that the rotor/stator interface can be eliminated and, thus, the blade–row interaction can be considered at an extremely small gap. The IB method was modified to internal-flow problems, and the adaptive mesh refinement (AMR) technique, together with a wall model, used to facilitate the simulations for high Reynolds-number flows. The results showed that both the pressure rise and the efficiency were observed to be higher in the smaller-gap cases. Comparisons between the results of two gaps, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>35</mn><mo>%</mo><msub><mi>c</mi><mi>a</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>3.5</mn><mo>%</mo><msub><mi>c</mi><mi>a</mi></msub></mrow></semantics></math></inline-formula>, are highlighted and further analysis at a specific flow coefficient showed that the increase of the stage performance was contributed to by the enhancement of rotor loading and the suppression to the flow separation of the stator. Correspondingly, the increases of the total pressure rise on the rotor and the stator outlets were observed to be <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.5</mn><mo>%</mo></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>4.3</mn><mo>%</mo></mrow></semantics></math></inline-formula>, respectively. Although the increase on the rotor outlet is much lower than that on the stator outlet, its significance is that a higher level of static pressure is formed near the hub of the gap, which, thus, reduces the adverse pressure gradient of this region in the stator passage. This improvement suppresses the flow separation near the hub of the stator and, thereby, results in a considerable increase to the pressure rise on the stator outlet as a consequence. The effect of the gap on unsteady pressure fluctuation is also presented.https://www.mdpi.com/2504-186X/8/1/6immersed boundary methodrotor/stator interactionadaptive mesh refinement |
| spellingShingle | Zhuo Wang Lin Du Xiaofeng Sun Enhancement of Rotor Loading and Suppression of Stator Separation through Reduction of the Blade–Row Gap International Journal of Turbomachinery, Propulsion and Power immersed boundary method rotor/stator interaction adaptive mesh refinement |
| title | Enhancement of Rotor Loading and Suppression of Stator Separation through Reduction of the Blade–Row Gap |
| title_full | Enhancement of Rotor Loading and Suppression of Stator Separation through Reduction of the Blade–Row Gap |
| title_fullStr | Enhancement of Rotor Loading and Suppression of Stator Separation through Reduction of the Blade–Row Gap |
| title_full_unstemmed | Enhancement of Rotor Loading and Suppression of Stator Separation through Reduction of the Blade–Row Gap |
| title_short | Enhancement of Rotor Loading and Suppression of Stator Separation through Reduction of the Blade–Row Gap |
| title_sort | enhancement of rotor loading and suppression of stator separation through reduction of the blade row gap |
| topic | immersed boundary method rotor/stator interaction adaptive mesh refinement |
| url | https://www.mdpi.com/2504-186X/8/1/6 |
| work_keys_str_mv | AT zhuowang enhancementofrotorloadingandsuppressionofstatorseparationthroughreductionofthebladerowgap AT lindu enhancementofrotorloadingandsuppressionofstatorseparationthroughreductionofthebladerowgap AT xiaofengsun enhancementofrotorloadingandsuppressionofstatorseparationthroughreductionofthebladerowgap |