Sections of dynamically non-stabilized flows in characteristic channels of the air-gas channels of liquid rocket engines turbopump units

Aeronautical and Space-Rocket Engineering

Thermal engines, electric propulsion and power plants for flying vehicles


DOI: 10.34759/vst-2020-3-167-185

Аuthors

Zuev A. A.1*, Arngol’d A. A.2**, Nazarov V. P.1***

1. Siberian State University of Science and Technology named after academician M.F. Reshetnev, 31, Krasnoyarsky Rabochy av., Krasnoyarsk, 660014, Russia
2. Krasnoyarsk Machine-Building Plant, 29, Krasnoyarsky Rabochy newspaper av., Krasnoyarsk, 660123, Russia

*e-mail: dla2011@inbox.ru
**e-mail: arngoldanna@mail.ru
***e-mail: nazarov@.sibsau.ru

Abstract

The sections of dynamically non-stabilized flows characteristic for the elements of air-gas channels of the turbopump units of the liquid rocket engines are being under consideration. Sector of variable cylindrical and rectangular cross-section, rotational flows in the cavities with immovable walls, and with immovable and rotating walls are studied. Inlet and outlet devices, sidelong cavities between rotor and stator, the cavities of hydrodynamic seals, as well as elements of inter-blade channel of the centrifugal pumps and gas turbines relate to the characteristic elements.

Due to the characteristic features of the operating and structural parameters, the initial sections of dynamically non-stabilized flows are predominant in the air-gas channels of the supply units. These sections affect significantly the energy parameters of the unit and thermal exchange processes and, as a consequence, the reliability of structural elements. Both, laminar and turbulent flow modes of the working fluid are being realized in the characteristic elements of the supply systems.

Using methods of the of the spatial boundary layer theory, the characteristic thicknesses of the boundary layer such as dynamic boundary layer thickness, the displacement thickness and momentum loss thickness were determined. Dependencies for determining the flow core velocity, which are necessary for estimating losses depending on the length of characteristic sections were obtained. To determine correctly the energy parameters, the right choice of the friction laws and velocity profiles in the boundary layer, as well as accounting for the initial section are necessary. The obtained dependencies are accounting for the velocity distribution profile in the boundary layer at the characteristic sections for the cases of both laminar and turbulent modes.

Keywords:

section of dynamically non-stabilized flow, velocity, losses in length, spatial boundary layer

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