SPF/DB Titanium Sandwich Panel With Airflow Cooling for Hypersonic Heat
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Solution Overview
Problem
Current thermal management strategies for hypersonic aerospace vehicles are inadequate, as existing materials like ceramic tiles and nickel alloys are either too heavy, expensive, or non-reusable, failing to effectively manage thermal loads at hypersonic speeds.
Innovation Solution
A superplastic formed and diffusion bonded (SPF/DB) exterior panel design featuring an exterior skin, an intermediate skin, and an interior skin with multicellular cores that provide tensile and compressive strength, along with airflow channels for cooling, which are integrally bonded to the skins using a manufacturing process involving superplastic forming and diffusion bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ceramic tiles are used for thermal protection, then thermal management capability is improved, but weight increases
Solution Approach 1:
The patent employs a composite structure consisting of a titanium alloy exterior skin integrated with a cellular core, forming a titanium foam sandwich structure. This composite material approach provides effective thermal protection against hypersonic heating while maintaining significantly lower weight compared to traditional ceramic tile systems, as the titanium alloy offers both structural strength and thermal resistance in an integrated lightweight configuration.
2Temperature
If nickel alloys are used for thermal protection, then thermal management capability is improved, but cost and weight increase
Solution Approach 1:
The patent utilizes a titanium alloy-based composite sandwich structure with a cellular core, replacing the heavier nickel alloy materials. This titanium foam composite provides comparable or superior thermal management capability at hypersonic speeds while achieving significant weight reduction, making the vehicle structure more fuel-efficient and economically viable.
3Temperature
If traditional thermal protection materials are used, then thermal protection is provided, but reusability is limited
Solution Approach 1:
The titanium alloy sandwich structure with cellular core provides inherent reusability because titanium is a durable, heat-resistant metal that can withstand multiple hypersonic flight cycles without degradation. Unlike consumable thermal protection materials, this metallic composite structure maintains its structural integrity and thermal protection capabilities across repeated use, enabling reusable vehicle designs.
4Temperature
If heavy thermal protection structures are used, then thermal management is improved, but fuel consumption increases
Solution Approach 1:
The lightweight titanium foam sandwich composite structure reduces the overall vehicle mass by eliminating heavy thermal protection systems. This weight reduction directly decreases the fuel required for acceleration and maintains lower fuel consumption throughout flight, while the integrated titanium alloy structure continues to provide effective thermal management at hypersonic speeds.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The SPF/DB sandwich structure effectively manages high heat flux environments at hypersonic speeds, offering a lightweight, cost-effective, and reusable solution for thermal protection, enhancing the structural integrity and cooling capabilities of hypersonic vehicles.
Implementation Method 1
providing an exterior skin of a superplastic material configured for atmospheric exposure... providing a pair, consisting of a top and a bottom, of core sheets of a superplastic material
Implementation Method 2
supplying an inert gas into the expansion pipes to superplastic form and diffusion bond the skins and core sheets, to create multicellular cores that are integrally bonded to the exterior, intermediate, and interior skins
Implementation Method 3
an airflow channel (AFC) extends through at least one of the multicellular cores... configured to cool the exterior panel
Data Source
AI summary
An exterior panel for hypersonic transport vehicles is formed of a superplastic metal alloy such as titanium for accommodating high thermal stresses of hypersonic flight. The exterior panel, designed as re-usable on such transport vehicles, includes an exterior skin configured for atmospheric exposure, and an interior skin configured for attachment to structural frame members of the transport vehicles. An intermediate skin is situated between a pair of multicellular cores; each multicellular core is sandwiched between the exterior and interior skins, one core being situated between the exterior and intermediate skins, while the other is situated between the intermediate and interior skins. An airflow channel (AFC) extends through at least one of the multicellular cores for cooling of the exterior panel. Each multicellular core is superplastic formed and diffusion bonded to the other, as well as to its respective pair of skins to form an exterior panel having a unified structure.