Selection of the Diffuser Type and Optimization of the Flow Path Part of a Low Speed Multistage Centrifugal Pump

Abstract

The issue of ensuring high energy efficiency of high-power pumps is relevant, since an in-crease in hydraulic efficiency of such pump flow parts leads to significant savings in the operation costs. Introduction of digital simulation technologies for the viscous fluid flow makes it possible to optimize geometry of the flow path elements at the design stage and predict pump characteristics with sufficient degree of accuracy. The main elements influencing characteristics of the multi-stage pumps flow parts include impellers and taps. Most often, vane and channel diffusers are used as retractors in the multistage pumps. Results of designing and optimizing flow parts of the low speed multistage centrifugal pump with both types of diffusers are presented, as well as predictive characteristics of pumps obtained using the computational fluid dynamics methods. Hydraulic efficiency of a stage with the channel-type guide (optimized version) is by 0.3 % higher than the efficiency of a stage with the vane-type guide. Both optimized flow paths have a non-sinking nature of pressure characteristics in the low flow region. The pump stage with the channel-type guide has a smaller radial overall dimension than the stage with the vane diffuser D_k / D_l = 0.88) and higher design manufacturability. It was found that the most preferable option for the feed electric pump stage with the n_s = 85 speed factor is the optimized flow path with the channel-type diffuser

The work was supported by the Ministry of Education and Science of the Russian Federation (agreement no. 075-11-2021-044, 06.25.2021)

Please cite this article in English as:

Klyuyev A.S., Fedorov S.P., Ivanov E.A., et al. Selection of the diffuser type and optimization of the flow path part of a low speed multistage centrifugal pump. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2023, no. 2 (145), pp. 98--113 (in Russ.). DOI: https://doi.org/10.18698/0236-3941-2023-2-98-113

References

[1] Bogun V.S. Sposoby povysheniya ekonomichnosti i resursa pitatelnykh nasosov dlya TES s energoblokami moshchnostyu 250...1200 MVt. Dis. kand. tekh. nauk [Methods to increase economical efficiency and service life of feed pumps for TPPs with 250--1200 MW power units. Сand. Sc. (Eng.). Diss.]. St. Petersburg, SPbPU, 2011 (in Russ.).

[2] Lomakin A.A. Tsentrobezhnye i osevye nasosy [Centrifugal and axial pumps]. Moscow, Mashinostroenie Publ., 1966.

[3] Danilov D.A., Zaytsev A.A., Lomakin V.O. Application of optimization methods to obtain the required characteristic form of a centrifugal pump. Gidravlika, 2021, no. 12 (in Russ.). Available at: http://hydrojournal.ru/svezhij-nomer-zhurnala-molodezhnyj-razdel/item/152-ispolzovanie-metodov-optimizatsii-dlya-polucheniya-trebuemoj-formy-kharakteris-tiki-tsentrobezhnogo-nasosa

[4] Zharkovskiy A.A., Borshchev I.O., Ivanov E.A., et al. Programma dlya vybora osnovnykh parametrov rabochego kolesa tsentrobezhnogo nasosa [Program for selection of main parameters of centrifugal pump impeller]. Software reg. certificate RU 2020617132. Appl. 19.06.2020, publ. 02.07.2020 (in Russ.).

[5] Zharkovskiy A.A., Borshchev I.O., Ivanov E.A., et al. Programma dlya vybora osnovnykh parametrov lopatochnykh otvodov tsentrobezhnykh nasosov [Program for choice of main parameters of vane bends for centrifugal pumps]. Software reg. certificate RU 2021681641. Appl. 15.12.2021, publ. 23.12.2021 (in Russ.).

[6] Zharkovskiy A.A., Borshchev I.O., Ivanov E.A., et al. Generator osevykh lopastnykh system [Axial vane system generator]. Software reg. certificate RU 2019665355. Appl. 19.11.2019, publ. 22.11.2019 (in Russ.).

[7] Zharkovskiy A.A., Borshchev I.O., Ivanov E.A., et al. Generator radialnykh lopastnykh system [Radial vane system generator]. Software reg. certificate RU 2019665786. Appl. 19.11.2019, publ. 28.11.2019 (in Russ.).

[8] Zharkovskiy A.A., Borshchev I.O., Ivanov E.A., et al. Programma dlya generatsii otvodov s nepreryvnoy zonoy perevoda [Program for generating leads with continuous translation zone]. Software reg. certificate RU 2021681328. Appl. 15.12.2021, publ. 21.12.2021 (in Russ.).

[9] Zharkovskiy A.A., Borshchev I.O., Ivanov E.A., et al. Generator prostranstva parametrov [Parameter space generator]. Software reg. certificate RU 2019665576. Appl. 15.11.2019, publ. 26.11.2019 (in Russ.).

[10] Gulich J.F. Centrifugal pumps. Cham, Springer International Publishing, 2019.

[11] Helton J.C., Davis F.J. Latin hypercube sampling and the propagation of uncertainty in analyses of complex systems. Reliab. Eng. Syst. Saf., 2003, vol. 81, no. 1, pp. 23--69. DOI: https://doi.org/10.1016/S0951-8320(03)00058-9

[12] Wang W., Pei J., Yuan S., et al. Application of different surrogate models on the optimization of centrifugal pump. J. Mech. Sc. Technol., 2016, vol. 30, no. 2, pp. 567--574. DOI: https://doi.org/10.1007/S12206-016-0110-0

[13] Shim H.S., Kim K.Y., Choi Y.S. Three-objective optimization of a centrifugal pump to reduce flow recirculation and cavitation. J. Fluids Eng., 2018, vol. 140, no. 9, art. 091202. DOI: https://doi.org/10.1115/1.4039511

[14] Pei J., Wang W., Yuan S., et al. Optimization on the impeller of a low-specific-speed centrifugal pump for hydraulic performance improvement. Chin. J. Mech. Eng., 2016, vol. 29, no. 5, pp. 992--1002. DOI: https://doi.org/10.3901/CJME.2016.0519.069

[15] Pei J., Wang W., Yuan S. Multi-point optimization on meridional shape of a centrifugal pump impeller for performance improvement. J. Mech. Sc. Technol., 2016, vol. 30, no. 11, pp. 4949--4960. DOI: https://doi.org/10.1007/s12206-016-1015-7

[16] Peng C., Zhang X., Gao Z., et al. Research on cooperative optimization of multiphase pump impeller and diffuser based on adaptive refined response surface method. Adv. Mech. Eng., 2022, vol. 14, no. 1, art. 168781402110729. DOI: https://doi.org/10.1177/16878140211072944

[17] Lomakin V., Valiev T., Chaburko P. Application of optimization algorithms to improve the vibroacoustic characteristics of pumps. IOP Conf. Ser.: Mater. Sc. Eng, 2020, vol. 779, no. 1, art. 012044. DOI: http://dx.doi.org/10.1088/1757-899X/779/1/012044

[18] McKay M.D., Beckman R.J., Conover W.J. A comparison of three methods for selecting values of input variables in the analysis of output from a computer code. Technometrics, 1979, vol. 21, no. 2, pp. 239--242. DOI: https://doi.org/10.2307/1268522