Effect of Motor Blockage on Transient Characteristics of Asymmetric Flow in a Double-suction Centrifugal Fan

Du, S.; Wu, X.; Wang, Z.; Yang, W.; Yang, Z.; Wang, Z.; Zhang, W.

doi:10.47176/jafm.18.4.2877

Effect of Motor Blockage on Transient Characteristics of Asymmetric Flow in a Double-suction Centrifugal Fan

Document Type : Regular Article

Authors

¹ Zhejiang Key Laboratory of Multiflow and Fluid Machinery, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China

² Zhejiang Yilida Ventilator Co., Ltd., Taizhou, Zhejiang 318056, China

³ Zhejiang Supcon Information Co., Ltd., Hangzhou, Zhejiang 310051, China

10.47176/jafm.18.4.2877

Abstract

The double-suction centrifugal fan is typically installed in the ventilation unit and driven by a motor beside it. One of the two inlets of the double-suction fan is partially blocked by the motor, and the flow in the fan becomes asymmetric and non-uniform. This work numerically investigated the effect of the motor blockage on the transient characteristics of the asymmetric flow in a centrifugal fan. The distance between the motor and the adjacent collector is typically 20mm or 40mm. Numerical results reveal that compared with the baseline motor-free model, the motor blockage of the two models decreases the flow rate by 30.4% and 20.8%, respectively, at the obstructed inlet of the fan, and the inflow is non-uniform and presents a local reversed flow. The motor blockage decreases the static pressure efficiency by 9.45% and 6.04%, respectively, while the static pressure rise is hardly affected. The flow fluctuation is notably asymmetric and non-uniform due to the non-axisymmetric geometry of the volute and the motor blockage. The blade passages are occupied by strong reversed flow, and a low-pressure region exists in the impeller. This work also performed a comparative study on the correctness and applicability of the boundary condition. The type of boundary condition of constant pressure at the outlet and a flow rate at the inlet, which is a common choice for fans without considering the obstacles, is analyzed. It was found that this type of boundary condition underestimates the efficiency of the fan with motor blockage, and the pressure field at the fan inlet is considerably different.

Keywords

Main Subjects

Turbomachinary

References

Chang, L., Yang, C., Su, X., Dai, X., Xu, Q., & Guo, L. (2024). Investigations on affinity law under gas–liquid conditions in multistage radial and mixed-flow multiphase pumps. International Journal of Fluid Engineering, 1, 013503. https://doi.org/10.1063/5.0191201

Chen, Z. Y., He, H. J., Yang, H., Wei, Y. K., & Zhang, W. (2024). Asymmetric flow in a double-suction centrifugal fan induced by an inclined impeller. Physics of Fluids, 36, 017113. https://doi.org/10.1063/5.0178927

Chen, Z. Y., Yang, H., Wei, Y. K., He, H. J., Zhang, C. Y., Nie, T. H., Yu, P. Q., & Zhang, Wei. (2022). Effect of a radially offset impeller on the unsteady characteristics of internal flow in a double-suction centrifugal fan. Processes, 10, 1-31. http://dx.doi.org/10.3390/PR10081604

González, J., Delgado, L., Velarde-Suárez, S., Fernández-Oro, J. M., Díaz, K. A., Rodríguez, D., & Méndez, D. (2020). Experimental study of the unsteady vibration signature for a Sirocco fan unit. Journal of Low Frequency Noise, Vibration and Active Control, 39, 129-148. https://journals.sagepub.com/doi/10.1177/1461348419837418

González, J., Oro, J. F., Delgado, L., Méndez, D., Argüelles, K. M., Velarde-Suárez, S., & Rodríguez, D. (2019). Symmetrized dot pattern analysis for the unsteady vibration state in a Sirocco fan unit. Applied Acoustics, 152, 1-12. http://dx.doi.org/10.1016/j.apacoust.2019.03.017

Gunn, E. J., Tooze, S. E., Hall, C. A., & Colin, Y. (2013). An experimental study of loss sources in a fan operating with continuous inlet stagnation pressure distortion. Journal of Turbomachinery, 135, 051002. http://dx.doi.org/10.1115/1.4007835

Hariharan, C., & Govardhan, M. (2016). Improving performance of an industrial centrifugal blower with parallel wall volutes. Applied Thermal Engineering, 109, 53-64. http://dx.doi.org/10.1016/j.applthermaleng.2016.08.045

Hariharan, C., & Govardhan, M. (2019). Aerodynamic performance and flow characteristics of an industrial centrifugal blower volute with varied cross-sectional shapes/area ratios. International Journal of Turbo & Jet-Engines, 36, 89-106. http://dx.doi.org/10.1515/tjj-2016-0060

Kang, D. H., Shinohara, T., Nakamura, S., Nishibe, K., Sato, K., Yokota, K., & Ohue, H. (2020). Performance degradation and flow instability of axial-flow fan due to upstream obstacle. Journal of Fluids Engineering, 142, 091207. http://dx.doi.org/10.1115/1.4047535

Kim, J. H., Cha, K. H., & Kim, K. Y. (2013). Parametric study on a forward-curved blades centrifugal fan with an impeller separated by an annular plate. Journal of Mechanical Science and Technology, 27, 1589-1595. http://dx.doi.org/10.1007/s12206-013-0404-4

Kim, J. S., Jeong, U. C., Kim, D. W., Han, S. Y., & Oh, J. E. (2015). Optimization of Sirocco fan blade to reduce noise of air purifier using a metamodel and evolutionary algorithm. Applied Acoustics, 89, 254-266.http://dx.doi.org/10.1016/j.apacoust.2014.10.005

Li, D. (2021). Design for new type centrifugal fan and passageway of the air conditioner indoor unit. IOP Conference Series: Earth and Environmental Science, 632, 052003. http://dx.doi.org/10.1088/1755-1315/632/5/052003

Li, W. (2024). Effects of interface model on performance of a vortex pump in CFD simulations. International Journal of Fluid Engineering, 1, 013901. https://doi.org/10.1063/5.0196213

Li, Z. H., Luo, P., Zhu, M. J., Chen, Z. Y., Liu, Y., & Li, G. H. (2023). Effect of motor installation heights on the performance of an isolated centrifugal fan. Processes, 11, 2116. http://dx.doi.org/10.3390/PR11072116

Lin, S., & Chou, C. (2004). Blockage effect of axial-flow fans applied on heat sink assembly. Applied Thermal Engineering, 24, 2375–2389. https://doi.org/10.1016/j.applthermaleng.2004.03.009

Liu, P., Shiomi, N., Kinoue, Y., Jin, Y. Z., & Setoguchi, T. (2012). Effect of inlet geometry on fan performance and flow field in a half-ducted propeller fan. International Journal of Rotating Machinery, 463585. http://dx.doi.org/10.1155/2012/463585

Liu, Z. F., Yang, H., He, H.J., Yu, P. Q., Wei, Y. K., & Zhang, W. (2022). Flow instability in a volute-free centrifugal fan subjected to non-axisymmetric pre-swirl flow from upstream bended inflow tube. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 236, 689-713. http://dx.doi.org/10.1177/09576509211062664

Lun, Y. X., Ye, X. X., Lin, L. M., Ying, C. L., & Wei, Y. K. (2019). Unsteady characteristics of forward multi-wing centrifugal fan at low flow rate. Processes, 7, 691-691. http://dx.doi.org/10.3390/pr7100691

MacDonald, M. A., Gullbrand, J., Nishi, Y., & Baugh, E. (2009). Notebook blower inlet flow and acoustics: experiments and simulations. Noise Control Engineering Journal, 57, 348-348. https://doi.org/10.3397/1.3151971

Madhwesh, N., Vasudeva, K. K., & Yagnesh, S. N. (2018). Effect of innovative circular shroud fences on a centrifugal fan for augmented performance - A numerical analysis. Journal of Turbomachinery, 32, 185-197.http://dx.doi.org/10.1007/s12206-017-1220-z

More, K. C., Dongre, S., & Deshmukh, G. P. (2019). Experimental and numerical analysis of vibrations in impeller of centrifugal blower. SN Applied Sciences, 2, 7-11.http://dx.doi.org/10.1007/s42452-019-1853-x

Motohiko, A., Tsuneaki, I., & Tomio, O. (2003). PIV measurement and numerical prediction of flow around a fan. Journal of the Visualization Society of Japan, 23, 203-206. http://dx.doi.org/10.3154/JVS.23.SUPPLEMENT1_203

Nilugal, M. L., Karanth, K. V., & Madhwesh, N. (2022). Numerical investigations on the effect of volute casing treatment for performance augmentation in a centrifugal fan. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 236, 2791-2802. http://dx.doi.org/10.1177/09544062211034190

Pathak, Y. R., Deore, K. D., & Ozarkar, R. R. (2020). Effect of impeller parameters on the flow inside the centrifugal blower using CFD. International Journal of Recent Technology and Engineering, 8, 3977-3980. http://dx.doi.org/10.35940/ijrte.f8973.038620

Patil, S. R., Chavan, S. T., Jadhav, N. S., & Vadgeri, S. S. (2018). Effect of volute tongue clearance variation on performance of centrifugal blower by numerical and experimental analysis. Materials Today: Proceedings, 5, 3883-3894. http://dx.doi.org/10.1016/j.matpr.2017.11.643

Qin, H. J., Wang, Z.D., He, H.J., Yang, W. X., Wang, Z.X., Zhu, Z. C., & Zhang, W. (2023). Effect of motor intrusion on the aerodynamic performances and unsteady characteristics of internal flow of a volute-free centrifugal fan. Proceedings of the Institution of Mechanical Engineers, 237, 729-746. http://dx.doi.org/10.1177/09576509221144212

Rong, L., Bohle, M., & Gu, Y. (2024). Improving the hydraulic performance of a high-speed submersible axial flow pump based on CFD technology. International Journal of Fluid Engineering, 1, 013902. https://doi.org/10.1063/5.0191683

Sui, D., Wang, S. S., Mao, J. R., Kim, T. & Lu, T. J. (2009). Exit flow behavior of axial fan flows with/without impingement. Journal of Fluids Engineering, 131, 061103. http://dx.doi.org/10.1115/1.3130246

Tsurusaki, H., & Kinoshita, T. (2001). Flow control of rotating stall in a radial vaneless diffuser. Journal of Fluids Engineering, 65, 1133-1151. http://dx.doi.org/10.1115/1.1351174

Wang, C., Mai, K., Fang, L. H., & Liu, N. T. (2021). Aerodynamic design and acoustic effect study of key geometric parameters of a Sirocco fan. Noise Control Engineering Journal, 69, 431-450. https://doi.org/10.3397/1/376940

Zhang, W. Q., & Vahdati, M. (2019). A parametric study of the effects of inlet distortion on fan aerodynamic stability. Journal of Turbomachinery ,141, 011011. http://dx.doi.org/10.1115/1.4041376

Zhao, X. T., & Guan, J. H. (2023). Influence of the spatial position of the semi-open impeller on the internal flow field in centrifugal fans. Journal of Physics: Conference Series, 2574. https://iopscience.iop.org/article/10.1088/1742-6596/2574/1/012007

Zheng, S. H., Shao, Z. H., Liu, J. F., Chen J. X., Li, Y. L., & Chai, M. (2023). Flow characteristics of a centrifugal fan with optimized edge curvatures of an impeller front disk. Proceedings of the Institution of Mechanical Engineers, 237, 916-928. https://journals.sagepub.com/doi/10.1177/09576509231154950

Zhou, W. Q., Zhou, P. J., Xiang, C., Wang, Y., Mou, J. G., & Cui, J. Y. (2023). A review of bionic structures in control of aerodynamic noise of centrifugal fans. Energies, 16, 4331. http://dx.doi.org/10.3390/EN16114331