Constructive and technological factors of stability of energy parameters in turbopump assemblies of rocket engines

Аuthors

Nazarov V. P.^1*, Yatsunenko V. G.^1**, Kolomentsev A. I.^2***

1. Siberian State University of Science and Technology named after academician M.F. Reshetnev, 31, Krasnoyarsky Rabochy av., Krasnoyarsk, 660014, Russia
2. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: nazarov@.sibsau.ru
**e-mail: vyatsunenko@mail.ru
***e-mail: a.i.kolomentsev@yandex.ru

Abstract

The level of operational and technical characteristics of propulsion systems in modern aircrafts is determined by a combination of functional, technological and economic indicators providing high quality of aerospace industry items. There are some features in use of rocket engines as part of carrier rockets and spacecrafts which stipulate increased demands to the reliability of all its structural elements and the engine as a whole.

One of the main indicators of rocket engines quality and reliability is a stability of energy parameters in high- speed centrifugal pumps of fuel liquid components supply system. In engine production it is controlled by the results of modeling hydrodynamic pumps testing and assessment of energy parameters dispersion (head and efficiency) in comparison with their values set by design documentation.

In general case deviation of functional parameter in complicated hydraulic system is determined by an error of every influencing element, values of influence coefficients and error spreading character.

For high-energy pumps any hydrodynamic parameter deviation is stipulated by influence of deviations in geometric dimensions of details in flow section, deviations of details mutual position because of error in pump assembling process, errors of measuring equipment during tests and maintenance of a given test regime.

Analyzing the results of pumps tests it is obvious that the task of energy parameters stabilization can be solved by increasing of manufacturing accuracy of hydraulic path details, decreasing of errors in pump assembling process, raising measuring accuracy and calculation of the controlled parameters in units tests.

Experimental studies of specific investment of constructive and technological factors into the energy parameters deviation were conducted by standardization method when the pointed value of controlled parameter was result of handling from 9 to 27 attempts that allowed significantly increase the experiment veracity.

Experimental and analytical researches, calculation of coefficients of constructive and technological factors influence are made for pumps with closed centrifugal wheels.

As a result of analytical and experimental researches it is developed a calculation method of head and efficiency deviations, considering the influence of constructive and technological factors into the energy parameters stability of centrifugal pumps. Solving of this task promotes to the creation of high quality rocket engines with set level of reliability.

Keywords:

rocket engines, centrifugal pumps, power parameters

References

1. Kolomentsev A.I., Kraev M.V., Nazarov V.P., Chervakov V.V., Yatsunenko V.G. Ispytanie i obespechenie nadezhnosti raketnykh dvigatelei (Test and maintenance of reliability), Krasnoyarsk, SibGAU-MAI, 2006, 336 p.
2. Kraev M.V., Nazarov V.P., Yatsunenko V.G. Materialy Respublikanskoi nauchno-tekhnicheskoi i proizvodstvennoi konferentsii «Problemy razvitiya aviakosmicheskoi otrasli», Tashkent, 19-20 April 2007, pp. 134-138.