Method for calculating wall temperature of flame tube with multiple inclined holes

Abstract

The invention belongs to the field of aero-engines, and particularly relates to a multi-inclined-hole flame tube wall temperature calculation method which comprises the following steps: establishing a heat balance relational expression in the step 1 based on internal radiation, internal convection, external radiation, external convection, in-hole convection and a heat conduction relational expression, and determining a nonlinear relational expression based on flame tube cold side wall temperature and flame tube hot side wall temperature; and solving according to a Newton iteration method to finally obtain the required flame tube wall temperature.

Description

technical field [0001] The application belongs to the field of aero-engines, and in particular relates to a method for calculating the wall temperature of a multi-inclined-hole flame tube. Background technique [0002] Multi-inclined hole cooling, also known as full-coverage film cooling, is widely used for its outstanding advantages such as high cooling efficiency (usually not less than 80%), small wall temperature gradient, small penetration depth of cooling air, and almost no interference with combustion. Applied to the main combustion chamber flame tube. As a composite cooling structure, the multi-slanted hole cooling includes various cooling methods such as convective heat transfer on the cold sidewall surface, convective heat transfer in the hole, and convective heat transfer on the hot sidewall surface. The radiation of the tube is also an important heat source that cannot be ignored. The heating environment of the porous cooling flame tube directly determines the w...

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Problems solved by technology

[0005] Processing the test piece and carrying out the test requires a lot of financial support. At the same time, the development of the test piece takes at least half a year. If the design needs to be improved after the test results are obtained, the test piece still needs to be processed and tested again, which is expensive and time-consuming

[0006] The numerical simulation calculation of wall temperature mainly adopts commercial software. Due to the multi-scale and strong three-dimensional flow characteristics of the aero-engine combustion chamber, coupled with the combustion of internal fuel, current simulation methods cannot accurately evaluate its flow and combustion characteristics, and the flow and combustion characteristics of the combustion chamber The characteristics determine the wall temperature distribution of the flame tube, so it is difficult to achieve accurate prediction of the wall temperature calculation

At the same time, the numerical simulation of the three-dimensional wall temperature of the multi-slanted-hole flame tube needs to establish a complex combustion chamber structure model. In order to improve the calculation accuracy, it is necessary to ensure a sufficiently small grid scale. Usually around 1mm, grid division is more difficult

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