Optimization design of thermal protective characteristics of special- shaped honeycomb structure

Abstract

This study addresses the thermal protection challenges during the flight of aircraft by proposing an actively cooled specially shaped honeycomb structure that integrates heat insulation and load-bearing capabilities. We conduct numerical simulations to analyze the parameters influencing the structure's flow and heat transfer characteristics. In addition, we perform an optimization design using an orthogonal experimental approach. The results indicate that under constant flow rates, the average inlet and outlet pressure drop (ΔP) decreases with increasing channel width (W) and increases with growing channel sidewall thickness (δ) and the length of the middle section of the channel (L2). The convective heat transfer coefficient (have) decreases with increasing (W) and increases with augmenting individual (δ) and (L2). The maximum equivalent stress increases with increasing (W) and decreases with growing (δ). When (δ) is set to 0.065 mm, W = 1.2 mm and L2 = 1.2 mm. Consequently, the comprehensive heat transfer factor (j) is maximized, and the flow heat transfer characteristics are optimal.

Keywords

• Aircraft thermal protection
• Specially shaped honeycomb structure
• Orthogonal experiment
• Comprehensive heat transfer factor