Theoretical Assessment of Possible Reduction in Mass Leaks of Working Medium from a Reciprocating Compressor Chamber

Abstract

The paper considers mass leaks of compressible medium through piston seals from the working chamber of a reciprocating compressor and possible ways of reducing those. We propose a monolithic lip piston design that should reduce mass leaks of the working medium and increase the efficiency of the piston compressor unit. We developed a computational technique that takes into account the processes inside the actual second compressor stage, including gas flows through imperfect seals in the working chamber. Combining previously published analytical equations with our promising piston seal design led to improving the following integral characteristics of the compressor stage: energy conversion efficiency, volumetric efficiency, gas compression temperature. Using the monolithic lip piston proposed should increase the reciprocating compressor unit efficiency by approximately 18 % via reducing the equivalent gap and increase volumetric efficiency by approximately 20 %, as mass leaks decrease while the mass of gas in the working chamber increases; as a result, the gas compression temperature should increase by approximately 18 %. We consider the monolithic lip piston proposed to be a promising piston seal design capable of reducing existing mass leaks, improving the indicated efficiency of the long-stroke second compressor stage along with the volumetric efficiency, and increasing the performance

Please cite this article in English as:

Busarov S.S., Kobylskiy R.E., Sinitsin N.G. Theoretical assessment of possible reduction in mass leaks of working medium from a reciprocating compressor chamber. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2022, no. 2 (141), pp. 101--111 (in Russ.). DOI: https://doi.org/10.18698/0236-3941-2022-2-101-111

References

[1] Busarov S.S., Yusha V.L. Experimental evaluation of indicator feed coefficient of a piston long-stroke compressor stage. Kompressornaya tekhnika i pnevmatika [Compressors & Pneumatics], 2020, no. 3, pp. 39--41 (in Russ.).

[2] Yusha V.L., Busarov S.S., Nedovenchanyy A.V., et al. Experimental study of working processes of low-speed long-stroke lubrication free piston compressor stages at high discharge pressure to suction pressures. Omskiy nauchnyy vestnik. Ser. Aviatsionno-raketnoe i energeticheskoe mashinostroenie [Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering], 2018, vol. 2, no. 2, pp. 13--18 (in Russ.). DOI: https://doi.org/10.25206/2588-0373-2018-2-2-13-18

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

[4] Prilutskiy I.K., Prilutskiy A.I. Raschet i proektirovanie porshnevykh kompressorov i detanderov na normalizovannykh bazakh [Calculation and design of reciprocating compressors and expanders on normalized bases]. St. Petersburg, SPbGAKhPT Publ., 1995.

[5] Yusha V.L., Busarov S.S. Determination of polytropic indicators of schematized working processes of air piston slow-moving long-stroke compressor stages. Omskiy nauchnyy vestnik. Ser. Aviatsionno-raketnoe i energeticheskoe mashinostroenie [Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering], 2020, vol. 4, no. 1, pp. 15--22 (in Russ.). DOI: https://doi.org/10.25206/2588-0373-2020-4-1-15-22

[6] Novikov I.I., Zakharenko V.P., Lando B.S. Bessmazochnye porshnevye uplotneniya v kompressorakh [Oil-free piston seals in compressors]. Leningrad, Mashinostroenie Publ., 1981.

[7] Zakharenko V.P. Osnovy teorii uplotneniy i sozdanie porshnevykh kompressorov bez smazki. Dis. d-ra tekh. nauk. [Fundamentals of seals theory and design of piston compressors without lubrication. Dr. Sc. (Eng.). Diss.]. St. Petersburg, SPbGUNiPT, 2001 (in Russ.).

[8] Pinchuk L.S. Sozdanie i issledovanie germetiziruyushchikh sistem v mashinostroenii na osnove termoplastov. Avtoref. dis. kand. tekh. nauk. [Design and research of sealing systems in mechanical engineering based on thermoplastics. Cand. Sc. (Eng.). Abs. Diss.]. Minsk, AN BSSR, 1974 (in Russ.).

[9] Korn G.A., Korn T.M. Mathematical handbook for scientists and engineers. McGraw-Hill, 1961.

[10] Demkin N.B. Kontaktirovaniya sherokhovatykh poverkhnostey [Contacting rough surfaces]. Moscow, Nauka Publ., 1970.

[11] Aynbinder S.B. On contact area between rubbing bodies. Izv. AN SSSR, OTN. Mekhanika i mashinostroenie, 1962, no. 6, pp. 172--174 (in Russ.).

[12] Demkin N.B. Issledovanie ploshchadi kasaniya sherokhovatykh poverkhnostey [Study on contact area of rough surfaces]. Moscow, AN SSSR Publ., 1959.

[13] Busarov S.S., Busarov I.S., Titov D.S. Experimental determination of conditional clearances for cylinder piston seals of compressor units. Omskiy nauchnyy vestnik. Ser. Aviatsionno-raketnoe i energeticheskoe mashinostroenie [Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering], 2019, vol. 3, no. 1, pp. 50--56 (in Russ.). DOI: https://doi.org/10.25206/2588-0373-2019-3-1-50-56

[14] Kragel’skiy I.V. Trenie i iznos [Friction and wear]. Moscow, Mashinostroenie Publ., 1968.

[15] Chichinadze A.V., Braun E.D., Bushe N.A., et al. Osnovy tribologii (trenie, iznos, smazka) [Fundamentals of tribology (friction, wear, lubrication)]. Moscow, Tsentr "Nauka i tekhnika" Publ., 1995.