Thermal Protection System:
As ISRO prepares for the uncrewed flight test sequence of the Gaganyaan human spaceflight mission, aerospace experts have detailed the functioning of the crew module’s Thermal Protection System (TPS).
- A Thermal Protection System (TPS) is a specialized, high-performance external shielding layer engineered to protect a spacecraft, space shuttle, or crew capsule from extreme aerodynamic heating and thermal flux during high-speed atmospheric ascent and hypersonic planetary re-entry.
Thermal Protection System:
- Dissipation of Extreme Kinetic Energy: Returning from Low Earth Orbit (LEO), the Gaganyaan capsule hits Earth’s upper atmosphere at hypersonic velocities. Over 99% of this massive kinetic energy is converted into intense shock-layer heating, generating plasma temperatures up to 1,800°C that would otherwise melt the metallic spacecraft structure.
- Irreversible Re-entry Dynamics: Unlike orbital launch phases where ascent aborts are possible, once atmospheric descent begins, there is no provision to abort the mission.
- Rapid Deceleration &Human Limitations: Rapidly fluctuating aerodynamic deceleration forces occur too quickly for manual intervention, demanding a completely passive, autonomous, and failsafe thermal barrier.
- Internal Habitability & Structural Integrity: The TPS ensures the internal habitable environment and underlying aluminum-alloy/CFRP structural frame remain well below structural tolerance limits.
