# Engineering Calculation of Axial Force Acting on Rotor of Electric Pumping Unit of Space Thermal Regulation Systems

• A. Bobkov
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

## Abstract

The article covers the method of calculating the axial force acting on the rotor of centrifugal electric pumping units used in spacecraft thermal regulation systems. The units shall have a long operational life numbering tens of thousands of hours of continuous operation. Their reliability of the design, precise calculation of radial and axial forces acting on the unit rotor are subject to increased requirements. Precise calculation of forces ensures a correct selection of the type and geometry of bearings in which the rotor is installed. The existing methods of calculating axial force in centrifugal blowers are based on the model of the non-flow type current of working medium in lateral gaps between the unit impeller and body. They use the assumption that the working medium behaves like a solid rotating body. In real designs of centrifugal electric pumping units used in spacecraft thermal regulation systems, current in the gaps is from the periphery to the center of the impeller, so the current is flow type. This essentially changes the nature of the static pressure distribution over the impeller radius, on which the value of axial force depends. Incorrect assumption of the non-flow type of working medium in lateral gaps results in large errors upon calculating the axial force. This paper provides the results of the experimental determination of the static pressure distribution diagram in the lateral gaps between the impeller and the unit body. The approximation of experimental data had been made, on the basis of which a simple algorithm of calculation of axial force was developed increasing the accuracy of calculations.

## Keywords

Axial force Electric pump Thermal system

## References

1. 1.
2. 2.
NASA astronauts went to space for the third time to repair the pump. https://ria.ru/science/20100816/265764991.html/. Accessed 21 Nov 2016
3. 3.
Martsinkovsky VA (1970) Gidrodinamika i prochnost’ tsentrobezhnykh nasosov (Hydrodynamics and strength of centrifugal pumps). Mashinostroyeniye, MoscowGoogle Scholar
4. 4.
Ovsyannikov BV, Borovsky BI (1986) Teoriya i raschot agregatov pitaniya zhidkostnykh raketnykh dvigateley (Theory and calculation of power units of liquid rocket engines). Mashinostroyeniye, MoscowGoogle Scholar
5. 5.
Ovsyannikov BV and Chebaevsky VF (eds) (1975) Vysokooborotnyye lopatochnyye nasosy (High-speed vane-type pumps). Mashinostroyeniye, MoscowGoogle Scholar
6. 6.
Ris VF (1981) Tsentrobezhnyye kompressornyye mashiny (Centrifugal compressor machines). Mashinostroyeniye, LeningradGoogle Scholar
7. 7.
Den GN (1973) Mekhanika potoka v tsentrobezhnykh kompressorakh (Mechanics of flow in centrifugal compressors). Mashinostroyeniye, LeningradGoogle Scholar
8. 8.
Baibikov VA, Karakhanian SK (1982) Gidrodinamika vspomogatel’nykh traktov lopastnykh mashin (Hydrodynamics of auxiliary tracts of vane machines). Mashinostroyeniye, MoscowGoogle Scholar
9. 9.
Verbitskaya OA (1957) Raspredeleniye davleniya v bokovykh pazukhakh tsentrobezhnykh nasosov s uchetom utechek (Pressure distribution in lateral sinuses of centrifugal pumps taking into account leakages). VINITI, MoscowGoogle Scholar
10. 10.
Borovsky BI (1989) Energeticheskiye parametry i kharakteristiki vysokooborotnykh lopastnykh nasosov (Energy parameters and characteristics of high-speed vane-type pumps). Mashinostroyeniye, MoscowGoogle Scholar
11. 11.
Dew HF (1966) Empirical method for calculation of radial pressure distribution on rotating discs. Power Mach Plants: Pap Am Soc Mech Eng 2:61–79Google Scholar
12. 12.
Ponomarev YuK, Belousov AI (2016) Method of study for elastically damping baseplates of turbo machines upon application of axial force and rotating pair of forces to them. Pumps Turbines Syst 3(20):46–49Google Scholar
13. 13.
Evgenyev SS, Petrosyan GG, Futin VA (2009) Calculation of axial gas dynamical forces, disk friction losses and migrations in half-opened impellers of centrifugal compressors. News of Higher Education Institutions. Aviat Technol 3:17–23Google Scholar
14. 14.
Funazaki K, Yamada K, Kikuchi M, Sato H (2008) Detailed studies on aerodynamic performance and unsteady flow behaviors of a single turbine stage with variable rotor-stator axial gap. Int J Gas Turbine Propul Power Syst (Japan) 2:30–37Google Scholar
15. 15.
Bobkov AV (2003) Tsentrobezhnyye nasosy sistem termoregulirovaniya kosmicheskikh apparatov (Spacecraft thermal regulation systems centrifugal pumps). Dalnauka, VladivostokGoogle Scholar
16. 16.
Kuzmin VN, Mikhaylov EM, Stoma SA (1996) Spacecraft electric pump units with rotor hydraulic supports. Electr Eng 5:24–26Google Scholar
17. 17.
Pamrin (1973) Aerodynamics of small-sized compressors and fans. Pap Am Soc Mech Eng. Power Mach Plants 3:125–132Google Scholar
18. 18.
Barenboym AB (1974) Low-flowrate freon turbochargers. Mashinostroyeniye, MoscowGoogle Scholar
19. 19.
Kraev MV, Lukin VA, Ovsyannikov BV (1985) Maloraskhodnyye nasosy aviatsionnykh i kosmicheskikh sistem (Low-flowrate pumps of aviation and space systems). Mashinostroyeniye, MoscowGoogle Scholar
20. 20.
Evgenyev SS, Zubrinkin AV (2012) Numerical and experimental analysis of current in lateral gaps between impeller and body of centrifugal compressor. Compressor Equip Pneumatics 6:36–39Google Scholar