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Mathematical and experimental modeling of centrifugal turbomachines’ operating modes with a coaxial arrangement of impellers

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Sergey Vladimirovich Podbolotov, Anatoliy Dmitrievich Kol'ga

S. V. Podbolotov, A. D. Kol'ga / News of the Ural State Mining University 1 (2018) 80–84 DOI 10.21440/2307-2091-2018-1-80-84

УДК 621.221

DOI 10.21440/2307-2091-2018-1-80-84

The relevance of this work is conditioned by the possibility of expanding the range of efficient operation of the turbine by changing the flow pattern of the fluid flow from stage to stage.

The purpose of the work is to establish rational modes of operation of turbo machines with coaxially mounted impellers. Research methodology: in this work, we used a systematic approach, which includes the analysis of the results of mathematical modeling and experimental studies.

Results. We carried out the analysis of the influence of operating modes on the pressure developed by the turbine. These operating modes include directions of rotation of impellers and the value of their circumferential speeds. The study analyzed the two options of installation: the rotation of the wheels in one direction and the rotation of the wheels in the opposite direction. The theoretical studies were based on a well-known Euler theory under certain assumptions: the cross section averaged for all flow settings; the motion of impellers was made one-dimensional and axisymmetric; the impellers have an infinite number of infinitely thin blades; the flow of fluid does not have viscosity, and the influence of friction forces is absent. The experimental aerodynamic characteristics of the centrifugal turbo machine with coaxial arrangement of driving wheels were obtained on an especially designed aerodynamic stand. Pressure-flow characteristics obtained theoretically and experimentally are presented.

Conclusion. The use of coaxial impellers contributes to developing pressure and allows you to extend the range of efficient operation of centrifugal turbo machines. The most rational mode of operation of coaxially mounted impellers is the counter rotation mode. The increase of pressure developed by the Turbo machinery at work in this mode is proven theoretically and confirmed experimentally. Sufficient convergence of mathematical and experimental studies suggests the reliability of the results.

Keywords: centrifugal turbo machine; coaxial arrangement; the pressureflow characteristic; energy transfer; operation; stand.

 

REFERENCES

1. Lobanov I. Ye. 2016, Matematicheskoye modelirovaniye intensifitsirovannogo teploobmena pri turbulentnom techenii v prodolno omyvayemykh puchkakh trub s poperechnymi koltsevymi kanavkami s primeneniyem kompaundnoy trekhsloynoy modeli turbulentnogo pogranichnogo sloya [Mathematical modeling of intensified heat transfer for turbulent flow in longitudinally lapped by bundles of tubes with transverse annular grooves with the use of the compound threelayer model of turbulent boundary layer]. Vestnik MGTU im. G. I. Nosova [The Vestnik of Nosov Magnitogorsk State Technical University], no. 1, pp. 109–115.

2. Makarov V. N., Gorbunov S. A., Kornilova T. A. 2013, Perspektivnoye napravleniye povysheniya effektivnosti ventilyatorov mestnogo provetrivaniya [A promising concept of improving the efficiency of ventilators of local ventilation]. Izv. vuzov. Gornyy zhurnal [News of the Higher Institutions. Mining Journal], no. 6, pp. 124–129.

3. Galerkin, Y. B., Rextin F. A., Soldatova, K. V., and Drozdov A. A. 2015, Radialnyye i oseradialnyye rabochiye kolesa tsentrobezhnykh kompressorov – preimushchestva, nedostatki, oblast’ primeneniya [Radial impellers of centrifugal compressors – advantages, disadvantages, and scope of use]. Kompressornaya tekhnika i pnevmatika [Compressor engineering and Pneumatics], no. 7, pp. 23–32.

4. Lomakin A. A., Gorgidzhanyan S. A. 1961, Issledovaniye i otrabotka stupeni pitatelnogo nasosa sverkhvysokogo davleniya k turboustanovke K-300-240-LMZ [Research and development stage of a feed pump high pressure to the turbine To-300-240-LMZ]. Trudy LPI [Proceedings of the Leningrad Polytechnic Institute], no. 215, pp. 142–158.

5. Kol'ga M. A., Vdovin K. N., Kol'ga A. D. 2008, Tsentrobezhnaya mashina dlya transportirovaniya tekuchego [Centrifugal machine for transporting fluid]. Patent RF no. 77917.

6. Podbolotov S. V., Kol’ga A. D. 2015, Tsentrobezhnyy nasos so stupenchatym raspolozheniyem rabochikh koles [A centrifugal pump with a stepped arrangement of impellers]. Aktualnyye problemy povysheniya effektivnosti i bezopasnosti ekspluatatsii gorno-shakhtnogo i neftepromyslovogo oborudovaniya. Gornaya elektromekhanika: materialy II Mezhdunar. nauch.-prakt. konf. [Topical problems of improving the efficiency and safety of operation of mining and oil field equipment. Mining electromechanics: proceedings of the 2nd International theoretical and practical conference]. Perm', vol. 1, pp. 57–62.

7. Sokolov Yu. N. 1955, Ob osevykh mashinakh so vstrechnym vrashcheniyem rabochikh koles [About axial machines with counter rotation of impellers]. Izv. TPU im. S. M. Kirova [Bulletin of the Tomsk Polytechnic University named after S. M. Kirov], vol. 80, pp. 67–81.

8. Zhumakhov I. M. 1958, Nasosy, ventilyatory i kompressory [Pumps, fans and compressors]. Moscow, 619 p.

9. Lomakin A. A. 1966, Tsentrobezhnyye i osevyye nasosy [Centrifugal and axial pumps]. Leningrad, 365 p. 10. Kovalevskaya V. I. Babak G. A., Pak V. V. 1976, Shakhtnyye tsentrobezhnyye ventilyatory [Mining centrifugal fan]. Moscow, 320 p.

11. Loytzyansky L. G. 1950, Mekhanika zhidkosti i gaza [Mechanics of liquid and gas]. Moscow, 678 p.

12. Podbolotov S. V., Kol’ga A.D. 2016, Gidravlicheskiye poteri v elementakh turbomashin [Hydraulic losses in elements of turbomachines]. Dobycha, obrabotka i primeneniye prirodnogo kamnya: sb. nauch. tr. pod red. G. D. Pershina [Extraction, processing and application of natural stone: collection of proceedings edited by G. D. Pershin]. Magnitogorsk, vol. 16, pp. 134–138.

13. Urmila B., D., Subba Rayudu. 2011, Optimum space vector PWM algorithm for three-level inverter. ARPN Journal of Engineering and Applied Sciences, Volume 6, no. 9, pp. 24 – 36.

14. Cherny S. G., Chirkov D. V., Lapin V. N., and others. 2006, Chislennoye modelirovaniye techeniy v turbomashinakh [Numerical simulation of flows in turbo machines]. Novosibirsk, 202 p.

15. Zharkovsky A. A. 2003, Issledovaniye vliyaniya osnovnykh parametrov na kharakteristiki tsentrobezhnykh nasosov nizkoy i sredney bystrokhodnosti [Studying the influence of the basic parameters on characteristics of centrifugal pumps of low and average speed]. Sovremennoye sostoyaniye i perspektivy razvitiya gidromashinostroyeniya v XXI veke: trudy MNTK [Modern condition and prospects of development of hydraulic engineering in the 21st century: proceedings of the International theoretical and technical conference]. St. Petersburg, pp. 92–93.

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