Dynamics of the flow in the sections of the elements of the supply path of the turbopump unit of the LRE

Dynamics of the flow in the sections of the elements of the supply path of the turbopump unit of the LRE

Автор: Arngold A.A., Zuev A.A., Tolstopyatov M.I., Dubynin P.A.

Журнал: Siberian Aerospace Journal @vestnik-sibsau-en

Рубрика: Aviation and spacecraft engineering

Статья в выпуске: 2 vol.23, 2022 года.

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The paper investigates areas of dynamically unstabilized flows characteristic of the elements of the flowing parts of turbopump units of liquid propellant rocket engines; studies of rectangular variable cross-section, cylindrical variable cross-section, rotational currents in cavities with fixed walls, fixed and rotat-ing walls. The specific elements include: delivery and discharge units, side cavities between the rotor and the stator, cavities of hydrodynamic seals and elements of the interblade channel of centrifugal pumps and gas turbines. Due to the specific features of the operating and design parameters, the initial components of dynami-cally unstabilized flows are predominant in the flow parts of the delivery units. These areas have a signifi-cant impact on the energy parameters of the assembly and affect the heat exchange processes and, as a result, the reliability of structural elements. In the specific elements of the feed systems, both laminar and turbulent modes of the flow of the working medium are realized. Using the methods of three-dimensional boundary layer theory, specific thicknesses of boundary layer such as thickness of dynamic boundary layer, displacement thickness and momentum loss thickness are determined. Dependences for determination of flow core velocities, necessary for evaluation of losses due to the length of specific sections, are obtained. Proper selection of friction laws and velocities profiles in the boundary layer and consideration of initial section is necessary for the purposes of reliable determina-tion of energy parameters. Obtained dependences consider velocity distribution profile in the boundary layer on specific sections of laminar and turbulent regimes cases.

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Section of dynamically non-stabilized flow, velocity, losses along the length, three-dimensional boundary layer

Короткий адрес: https://sciup.org/148329624

IDR: 148329624   |   DOI: 10.31772/2712-8970-2022-23-2-242-261

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