A non-uniform sinusoidal longitudinal corrugated insulation panel structure and design method

CN122304884APending Publication Date: 2026-06-30BEIJING POWER MACHINERY INST

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: BEIJING POWER MACHINERY INST
Filing Date: 2024-12-31
Publication Date: 2026-06-30

AI Technical Summary

Technical Problem

Existing longitudinal corrugated heat insulation screens are difficult to cool effectively under high temperature and high pressure environments. Insufficient cooling gas volume leads to a shortened lifespan of the heat insulation screens and makes them susceptible to corrosion by hot gas, resulting in severe oscillation and combustion phenomena.

Method used

A non-uniform sinusoidal longitudinal corrugated heat shield structure is designed, with the corrugation length gradually increasing. Combined with an optimized air film hole layout, the opening area ratio of the air film holes in the upstream high-temperature zone is increased, thereby improving cooling efficiency and oscillation suppression effect.

Benefits of technology

When the amount of cold air is low, the cooling effect and cold air utilization rate of the heat insulation screen can be improved, thermal stress can be reduced, vibration combustion can be suppressed, the life of the heat insulation screen can be extended, and the vibration resistance can be enhanced.

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Figure CN122304884A_ABST

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Abstract

This invention provides a non-uniform sinusoidal longitudinal corrugated heat shield structure and design method. The heat shield structure includes a heat shield cylinder and a support member. The heat shield cylinder includes a cylindrical corrugated section open at both ends and a straight circular section connected to both ends of the corrugated section. The wall corrugations of the corrugated section are non-uniform sinusoidal waves distributed along the axial direction. The corrugation length gradually increases along the combustion chamber inlet to outlet direction according to a set ratio. The straight circular section is a ring structure with a fixed diameter. A plurality of film cooling holes are machined on the heat shield cylinder. Each film cooling hole row includes a plurality of film cooling holes evenly distributed along the circumference of the heat shield cylinder. The opening area of the film cooling holes of each corrugation gradually decreases along the combustion chamber inlet to outlet direction. The support member is an Ω-shaped protrusion structure fixed to the outer surface of the heat shield cylinder. The heat shield cylinder is coaxially installed inside the combustion chamber cylinder. This invention improves the cooling effect of the heat shield and the utilization rate of cold air, reduces overall thermal stress, and improves engine performance.

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