Flow heat exchange characteristic analysis method for micro-channels with different-configuration truncation fins

By analyzing the microchannel flow heat transfer characteristics of different configurations of truncated fins in the scramjet engine of hypersonic vehicles, the V-shaped arrangement was selected, which solved the problem of heat transfer deterioration of supercritical hydrocarbon fuels in the transcritical process and achieved more efficient thermal management and safety.

CN122365997APending Publication Date: 2026-07-10BEIHANG UNIV
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Patent Information

Application Number
CN202610408252.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-31
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In the scramjet engine of hypersonic vehicles, the drastic changes in the physical properties of supercritical hydrocarbon fuel during the transcritical process lead to reshaping of the flow field structure and changes in turbulence intensity, frequently inducing heat transfer deterioration and affecting the system's heat absorption efficiency and safety.

Method used

The microchannel flow heat transfer characteristics analysis method with different configurations of truncated fins was adopted. Four truncated fin arrangement configurations (T-type, P-type, A-type, and V-type) were studied by numerical simulation to evaluate their ability to suppress heat transfer degradation and improve thermophysical stratification in supercritical hydrocarbon fuels, and the optimal truncated fin arrangement configuration was selected.

Benefits of technology

The V-shaped truncated fin arrangement significantly reduces the maximum wall temperature, achieving better thermal uniformity and higher heat transfer performance, enhancing convective heat transfer intensity, reducing the thermal resistance layer, and ensuring engine safety and lifespan.

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Abstract

The invention relates to the technical field of thermal protection of aviation power systems of hypersonic aircrafts, and provides a flow heat exchange characteristic analysis method for micro-channels of different-configuration truncated fins, which comprises the following steps: constructing a regenerative cooling micro-channel; supercritical hydrocarbon fuel is introduced into the regenerative cooling micro-channel, and wall surface heat flow is applied to the heated section; at least four different cut-off fin arrangement configurations are arranged; obtaining flow parameters and heat exchange parameters of the micro-channel under each configuration through numerical simulation; based on the flow parameters and the heat exchange parameters, the heat exchange deterioration inhibition capacity, the thermal physical stratification improvement degree and the comprehensive heat exchange performance of each configuration on the supercritical hydrocarbon fuel are evaluated; and screening an optimal truncated fin arrangement configuration according to an evaluation result. According to the method, conversion from a natural convection dominant state where heat transfer deterioration is likely to happen to an efficient forced convection heat transfer state is successfully achieved, the heat reliability of a regenerative cooling system is improved, and an important reference is provided for topological optimization of a high-performance aero-engine heat protection system.
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