Problems of the starting and operating of hydraulic components and systems in low ambient temperature. (Part IV). Modelling the heating process and determining the serviceability of hydraulic components during the starting-up in low ambient temperature
Designers of hydraulically driven machines and devices are obliged to ensure during design process their high service life with taking into account their operational conditions. Some of the machines may be started in low ambient temperature and even in thermal shock conditions (due to delivering hot working medium to cold components). In order to put such devices into operation appropriate investigations, including experimental ones - usually very expensive and time-consuming, are carried out. For this reason numerical calculations can be used to determine serviceability of a hydraulic component or system operating in thermal shock conditions. Application of numerical calculation methods is much less expensive in comparison to experimental ones. This paper presents a numerical calculation method which makes it possible to solve issues of heat exchange in elements of investigated hydraulic components by using finite elements method. For performing the simulations the following data are necessary: ambient temperature, oil temperature, heat transfer coefficient between oil and surfaces of elements, as well as areas of surfaces being in contact with oil. By means of computer simulation method values of clearance between cooperating elements as well as ranges of parameters of correct and incorrect operation of hydraulic components have been determined. In this paper results of computer simulation of some experimentally tested hydraulic components such as axial piston pump and proportional spool valve, are presented. The computer simulation results were compared with the experimental ones and high conformity was obtained
- 1. Balawender A.: Energy analysis and testing methods of slow-speed hydraulic motors (in Polish). Zeszyty Naukowe PG. Gdańsk 1988.
- 2. Jasiński R.: Operation of selected slow-speed hydraulic motors in thermal shock conditions (in Polish). Doctorate thesis, supervisor: A. Balawender. Gdańsk 2002.
- 3. Jasiński R.: Problems of the starting and operating of hydraulic components and systems in low ambient temperature (Part I). Polish Maritime Research, 4/2008.
- 4. Jasiński R.: Problems of the starting and operating of hydraulic components and systems in low ambient temperature (Part II). Determining the clearance between cooperating elements during the hydraulic components start-up in extremely low ambient temperatures on the grounds of experimental research. Polish Maritime Research, 1/2009.
- 5. Jasiński R.: Problems of the starting and operating of hydraulic components and systems in low ambient temperature (Part III). Methods of determining parameters for correct start-ups of hydraulic components and systems in low ambient temperatures. Polish Maritime Research, 4/2009.
- 6. Jasiński R.: Research and method for assessment of operation of hydraulic drive components started in low ambient temperature and supplied with hot working medium (in Polish). Report on execution of the research project financed by Polish Ministry of Science and Higher Education (in Polish) , No. 4 T07C042 30, Gdańsk 2010.
- 7. Jasiński R.: Operation of hydraulic drives in low ambient temperatures. Part II (in Polish). Hydraulika i Pneumatyka, 2/2011.
- 8. Jasiński R.: Operation of hydraulic drives in low ambient temperatures. Part V (in Polish). Hydraulika i Pneumatyka, 6/2011.
- 9. Jasiński R.: Determination of ability of machines with hydraulic drive during start-up in low ambient temperatures. Journal of KONES Powertrain and Transport, Vol 1, No. 16, 2009.
- 10. Jasiński R.: Determination of ability of hydrotronic systems to start in low ambient temperatures. Solid State Phenomena. - Vol. 164, 2010.
- 11. Jasiński R.: Experimental tests of axial piston pump PWK 27 from HYDROTOR company in low ambient temperatures (in Polish). Napędy i Sterowanie, 4/2008.
- 12. Jasiński R., Lewandowski P.: Modelling the heating process of a x ia l piston pu mp PW K 27 f rom H Y DROTOR compa ny during start-up in low ambient temperatures (in Polish). Napędy i Sterowanie, 6/2008.
- 13. Kleiber M.: Introduction to finite elements method (in Polish). PWN, Warszawa-Poznań, 1989.
- 14 . Landvogt B.; Osiecki L.; Patrosz P.; Zawistowski T.; Zylinski B.: Numerical simulation of fluid-structure interaction in the design process for a new axial hydraulic pump. Progress in Computational Fluid Dynamics. Vol. 14, No. 1, 2014. doi: 10.1504/PCFD.2014.059198.
- 15. Osiecki A., Osiecki L.: Development efforts on new design of axial piston pumps (in Polish). Hydraulika i Pneumatyka 4/1998, pp. 49.
- 16. Osiecki L., Patrosz P., Zawistowski T., Landvogt B., Piechna J., Żyliński B.: Compensation of pressure peaks in PWK-type hydraulic pumps. Key Engineering Materials. Vol. 490., (2012), s.33-44. doi: 10.4028/www.scientific.net/KEM.490.33.
- 17. Paszota Z.: Energy losses in hydrostatic drive. LABERT Academic Publishing, 2016.
- 18. Paszota Z.: Energy losses in the hydraulic rotational motor - definitions and relations for evaluation of the efficiency of motor and hydrostatic drive. Polish Maritime Research 2(65)/2010.
- 19. Pobędza J., Sobczyk A.: Properties of high pressure water hydraulic components with modern coatings. Advanced Materials Research. Trans Tech Publications Ltd, 849/2014. doi: 10.4028/www.scientific.net/AMR.849.100.
- 20. Rusiński E.: Finite elements method. COSMOS/M System (in Polish). Wydawnictwa Komunikacji i Łączności, Wa rsz awa 19 94 .
- 21. Szargut J.: Numerical modelling of temperature fields (in Polish). WNT, Warszawa 1992.
- 22. Śliwiński P.: The influence of water and mineral oil on the mechanical losses in a hydraulic motor. Chinese Journal of Mechanical Engineering. Article accepted for publication.
- 23. Śliwiński P.: Influence of water and mineral oil on the leaks in satellite motor commutation unit clearances. Polish Maritime Research. Article accepted for publication.
- 24. Śliwiński P.: The influence of water and mineral oil on volumetric losses in a hydraulic motor. Polish Maritime Research, vol. 24, 2017. Doi: 10.1515/pomr-2017-0041.
- 25. Śliwiński P.: The basics of design and experimental tests of the commutation unit of a hydraulic satellite motor. Archives of Civil and Mechanical Engineering, No. 16/2016, DOI: 10.1016/j.acme.2016.04.003.
- 26. Śliwiński P.: The flow of liquid in flat gaps of satellite motors working mechanism. Polish Maritime Research, No. 2/2014.
- 27. Śliwiński P.: New satellite pumps. Key Engineering Materials, No. 490/2012.
- 28. Wiśniewski S., Wiśniewski T.: Heat exchange (in Polish). WNT, Warszawa 2000.
- 29. Walczak P., Sobczyk A.: Simulation of water hydraulic control system of francis turbine. American Society of Mechanical Engineers, 2014. doi: dx.doi.org/10.1115/FPNI2014-7814.
- 30. Rutkiewicz Ł.: Experimental tests of operation of a proportional spool valve in low ambient temperature conditions ( in Polish). Diploma thesis, supervisor: R. Jasiński, Gdańsk University of Technology, Gdańsk, 2006.
- 31. Staniszewski B.: Heat exchange (in Polish). PWN, Warszawa, 1980.
- 32. Złoto T., Nagorka A.: An efficient FEM for pressure analysis of oil film in a piston pump. Applied Mathematics and Mechanics, Vol.30, No. 1/2009.
- 33. Catalogues from Hydrotor company.
- 34. Catalogues from Parker company.
- 35. Catalogues from Sauer-Danfoss company