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Investigating the Effect of the Axial Clearance Magnitude Between the Covering Disc of the Runner and the Centrifugal Compressor Body on the Gas Dynamics in a Low-Discharge Stage Prototype

Authors: Yablokov A.M., Shtanichev R.A., Sadovskiy N.I., Kozhukhov Yu.V. Published: 22.10.2020
Published in issue: #5(134)/2020  

DOI: 10.18698/0236-3941-2020-5-106-120

 
Category: Power, Metallurgic and Chemical Engineering | Chapter: Machines and Devices, Processes of Refrigeration and Cryogenic Engineering, Air Conditioning  
Keywords: low-discharge stage, centrifugal compressor, computational gas dynamics, disc friction, internal leakage, ANSYS CFX

The paper presents the results of numerically investigating viscous gas flow in a simulated low-discharge stage of a super high-pressure type compressor, using the ANSYS CFX software package. We studied the low-discharge centrifugal compressor stage prototype designed and tested at the Compressor, Vacuum and Refrigerating Technology Department of Peter the Great St. Petersburg Polytechnic University. In order to conduct the numerical experiment, we performed a mesh independence study. We compared the properties obtained in the numerical investigation to the experimental data. In our mathematical simulation the magnitude of the axial clearance between the covering disc of the runner and the compressor body varies in the range of 1--5.5 mm; we estimate the effect that varying this number has on the loss complex characteristic 1 + βfriction + βleakage

References

[1] Gulyaev S., Rybnitskiy V., Fadeev D. Analitika i issledovaniya assotsiatsii "Novye tekhnologii gazovoy otrasli". Analiticheskiy otchet. Vyp. 2. [Analytics and research of "Gas industry new technologies" association. Analytical report. Iss. 2]. Moscow, Gazprom Publ., 2016.

[2] Gayvoronskiy A. Rost pokazateley [Increase in figures]. Gazprom Publ., 2019, no. 5, pp. 28--31 (in Russ.).

[3] Sadovskiy N.I. Povyshenie effektivnosti maloraskhodnykh stupeney tsentrobezhnykh kompressorov vysokogo i sverkhvysokogo davleniya a osnove izucheniya vliyaniya chisla Reynol’dsa i sherokhovatosti na rabochie protsessy. Avtoref dis. kand. tekh. nauk. [Raising efficiency of low emission stages of high and ultrahigh-pressure compressors based on studying effect of Reynolds number on working processes. Cand. Sc. (Eng.). Abs. Diss.]. St. Petersburg, SPbGTU Publ., 1994 (in Russ.).

[4] Trudy nauchnoy shkoly kompressorostroeniya SPbGPU [Works of SPbGPU compressor engineering scientific school]. St. Petersburg, Polytechnic Univ. Publ., 2010.

[5] Opisanie arkhitektury i protsessa resheniya tipovykh zadach posredstvom paketa ANSYS CFX [Describing architecture and process of solving typical problems using ANSYS CFX] software. supercomputer.susu.ru: website (in Russ.). Available at: https://supercomputer.susu.ru/users/instructions/cfx_arch (accessed: 23.05.2019).

[6] Ivanov V.M., Kozhukhov Yu.V., Danilishin A.M., et al. Calculation of inviscid and viscous flow for the impellers head characteristics determination of the centrifugal compressors low-flow stages. Energosberezhenie i vodopodgotovka [Energy Saving and Water Treatment], 2019, no. 3, pp. 55--59 (in Russ.).

[7] Ivanov V.M., Kozhukhov Yu.V., Danilishin A.M., et al. Working process simulation and validation in model low emission stage of centrifugal compressor. Novoe v rossiyskoy elektroenergetike, 2019, no. 6, pp. 12--19 (in Russ.).

[8] Neverov V.V., Kozhukhov Y.V., Yablokov A.M., et al. Optimization of a centrifugal compressor impeller using CFD: the choice of simulation model parameters. IOP Conf. Ser.: Mater. Sc. Eng., 2017, vol. 232, art. 012037. DOI: https://doi.org/10.1088/1757-899X/232/1/012037

[9] Kartashov S.V., Kozhukhov Yu.V., Lebedev A.A., et al. Computational gas dynamics as a tool for improving flowpath of centrifugal compressor. Kholodilʼnaya tekhnika, 2019, no. 7, pp. 26--33 (in Russ.).

[10] Yablokov A.M., Kozhukhov Yu.V., Lebedev A.A. An ANSYS CFX numerical study of a low-flow stage of a centrifugal compressor. Nauchno-tekhnicheskie vedomosti SPbPU. Estestvennye i inzhenernye nauki [St. Petersburg Polytechnic University Journal of Engineering Science and Technology], 2015, no. 4, pp. 59--69 (in Russ.). Available at: https://engtech.spbstu.ru/article/2015.94.7

[11] Pugachev P.V., Svoboda D.G., Zharkovskiy A.A. Raschet i proektirovanie lopastnykh gidromashin [Calculation and design of bladed hydraulic machines]. St. Petersburg, Polytechnic Univ. Publ., 2016.

[12] Kabalyk K., Kryllowicz W. Numerical modeling of the performance of a centrifugal compressor impeller with low inlet flow coefficient. Transactions IFFM, 2016, vol. 131, pp. 97--109.

[13] Borovkov A.I., Voynov I.B., Galerkin Yu.B., et al. Issues of gas dynamic characteristics modeling on the example of the centrifugal compressor model stage. Nauchno-tekhnicheskie vedomosti SPbPU. Estestvennye i inzhenernye nauki [St. Petersburg Polytechnic University Journal of Engineering Science and Technology], 2018, vol. 24, no. 2, pp. 44--57 (in Russ.). Available at: https://engtech.spbstu.ru/article/2018.104.4