Experimental determination of the friction force in a low-speed, long-stroke, grease-free stage

It is determined that the mechanical losses in the slow-speed stage, despite the large pressure drop (? = 100), are less than the mechanical losses in high-speed compressors. It is recommended to take the power spent on overcoming the friction forces in the sleeve cylinder piston seal equal to 10–15 % of the indicator power of the stage. Since there is only one friction unit in the low-speed stage, the power required to overcome mechanical friction is equal to the power expended to overcome the friction forces in the sleeve cylinder piston seal. The mechanical efficiency of the slow-speed stage is in the range of 0.89–0.92, which corresponds to the mechanical efficiency of high-performance gas engine compressors having a common shaft with a drive. The total isothermal efficiency of a low-speed long-stroke stage lies in the range of 0.50–0.95, while for high-speed compressors the total isothermal efficiency lies in the range of 0.60–0.75. The friction force caused by the forces of the material’s own elasticity and expander pressure was also determined for various cylinder diameters.
EDN: VSACVC, https://elibrary/vsacvc

References

[1] Frenkel M.I. Porshnevye kompressory [Piston compressors]. Leningrad, Mashinostroenie Publ., 1969. 744 p. (In Russ.).

[2] Yusha V.L. Theoretical assessment of the effectiveness of application single-stage long-stroke piston compressors in refrigeration and hydrocarbon gas liquefaction systems. Omskiy nauchnyy vestnik. Ser. Aviatsionno-raketnoe i energeticheskoe mashinostroenie [Omsk Scientific Bulletin. Ser. Aviation-Rocket and Power Engineering],, 2024, vol. 8, no. 1, pp. 17–24, doi: https://doi.org/10.25206/2588-0373-2024-8-1-17-24 (in Russ.).

[3] Busarov S.S., Goshlya R.Yu., Gromov A.Yu. et al. Mathematical modelling of heat exchange processes in the working chamber of a low-speed stage of a reciprocating compressor. Kompressornaya tekhnika i pnevmatika [Compressors & Pneumatics], 2016, no. 6, pp. 6–10. (In Russ.).

[4] Khamatova D.N., Yuldashev E.U. Study of factors affecting the efficiency of reciprocating compressors. Universum: tekhnicheskie nauki, 2024, no. 2. URL: https://7universum.com/ru/tech/archive/item/16914 (in Russ.).

[5] Nedovenchanyi A.V., Yusha V.L., Busarov S.S. Experimental evaluation of the efficiency of long-stroke, low-speed reciprocating compressor stages in compression of different gases. Chem. Petrol. Eng., 2018, vol. 54, no. 4, pp. 593–597, doi: https://doi.org/10.1007/s10556-018-0520-1.

[6] Novikov I.I., Zakharenko V.P., Lando B.S. Bessmazochnye porshnevye uplotneniya v kompressorakh [Lubrication-free piston seals in compressors]. Leningrad, Mashinostroenie Publ., 1981. 238 p. (In Russ.).

[7] Yusha V.L., Busarov S.S., Gromov A.Yu. Assessment of the prospects of development of medium-pressure single-stage piston compressor units. Chem. Petrol. Eng., 2017, vol. 53, no. 3, pp. 453–458, doi: https://doi.org/10.1007/s10556-017-0362-2.

[8] Grezin A.K., Zinovyev V.S. Mikrokriogennaya tekhnika [Microcryogenic technology]. Moscow, Mashinostroenie Publ., 1977. 232 p. (In Russ.).

[9] Kotlov A.A. An experimental study of a two-stage reciprocating compressor. Izvestiya vysshikh uchebnykh zavedeniy. Mashinostroenie [BMSTU Journal of Mechanical Engineering], 2019, no. 2, pp. 65–76. EDN: YWZVSP (in Russ.).

[10] Molostov A.V. The effect of intermediate pressure on the operation of a two-stage reciprocating compressor (general purpose compressor). Vestnik Mezhdunarodnoy akademii kholoda [Journal of International Academy of Refrigeration], 2022, no. 1, pp. 44–52, doi: https://doi.org/10.17586/1606-4313-2022-21-1-44-52 (in Russ.).

[11] Nikiforov A.G., Muslova L.A. The effect of wall mobility on mass flow in a slow-moving long-stroke stage. Omskiy nauchnyy vestnik. Ser. Aviatsionno-raketnoe i energeticheskoe mashinostroenie [Omsk Scientific Bulletin. Ser. Aviation-Rocket and Power Engineering], 2023, no. 7, pp. 9–14, doi: https://doi.org/10.25206/2588-0373-2023-7-4-9-14 (in Russ.).

[12] Konoplev N.G., Korobkov G.E. Field research of the energy processes of liquid flow in a pipeline. Transport i khranenie nefteproduktov i uglevodorodnogo syrya [Transport and Storage of Oil Products and Hydrocabons], 2019, no. 1, pp. 28–33, doi: https://doi.org/10.24411/0131-4270-2019-10106 (in Russ.).

[13] Buryy G.G. The program for calculating the hydraulic cylinder of the hydraulic drive. Izvestiya TulGU. Tekhnicheskie nauki [News of the Tula State University. Technical Sciences], 2022, no. 12, pp. 226–230. (In Russ.).

[14] Prilutskiy I.K., Kazimirov A.V., Molodova Yu.I. Prediction of the parameters for the experimental stage of the compressor with a linear drive and a variable cylinder diameter when operating as a part of electrochemical air regeneration systems. Vestnik Mezhdunarodnoy akademii kholoda [Journal of International Academy of Refrigeration], 2021, no. 4, pp. 18–29, doi: https://doi.org/10.17586/1606-4313-2021-20-4-18-29 (in Russ.).

[15] Tsvetkov V.A., Zhignovskaya D.V. About deformation of non-metallic piston seals of the compressor. Vestnik nauki i obrazovaniya Severo-Zapada Rossii [Journal of Science and Education of North-West Russia], 2019, vol. 5, no. 4, pp. 49–57. (In Russ.).