Local heat transfer parameters in the areas of the developing temperature boundary layer in the cavities of gas turbines local heat transfer parameters in the areas of the developing temperature boundary layer in the cavities of gas turbines

Local heat transfer parameters in the areas of the developing temperature boundary layer in the cavities of gas turbines local heat transfer parameters in the areas of the developing temperature boundary layer in the cavities of gas turbines

Автор: Zuеv А.А., Аrngold А.А., Falkova E.V., Tolstopyatov M.I., Dubynin P.А.

Журнал: Siberian Aerospace Journal @vestnik-sibsau-en

Рубрика: Aviation and spacecraft engineering

Статья в выпуске: 3 vol.23, 2022 года.

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In this work, an analytical determination of the local heat transfer coefficient in the planes of rotation of gas turbines is carried out using an affine-like model for the distribution of temperature and dynamic spatial boundary layers with a convective component (at Pr < 1). The method of analytical study used in the work led to results close to the experimental values. The problem of determining the thickness of the energy loss is solved using the integral relation of the energy equation of the temperature spatial boundary layer, which makes it possible to integrate the necessary curvature over the surface. The law of heat transfer of the turbulent boundary layer for the rotational motion of the flow and motion according to the law of “solid body” is expressed. Equations are obtained for determining the local heat transfer coefficient by the Stanton criterion for various external flow laws for a power-law velocity distribution in the boundary layer according to the affine-like model of the temperature boundary layer. Heat transfer coefficients correlate with sufficient accuracy with experimental data and dependencies published by other authors: J. M. Owen, L. A. Dorfman, I. V. Shevchuk. The deviation of the results obtained from the dependence of the model with a convective component and with affinity-like profiles do not have statistically significant differences. The obtained results of the study and their comparison with the results of other authors showed that they are suitable for engineering calculations and analysis of the impact of local heat transfer coefficients on high-temperature units of a turbopump unit.

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Rotational motion of the flow, gas cavities of turbopump unit, affine-like model, energy loss thickness equations, heat transfer coefficient

Короткий адрес: https://sciup.org/148329640

IDR: 148329640   |   DOI: 10.31772/2712-8970-2022-23-3-437-450

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