Re-Entery Heating
THERMAL RE-ENTRY
KW / M²
Awaiting entry parameters...
Re-entry Heating
The Kinetic Brake. To land, a rocket must "dump" its orbital energy. The atmosphere acts as a giant brake, but that energy has to go somewhere. It turns into a shield of 3,000°C plasma that envelopes the craft.
- 🔥 Stagnation Point: Where air is compressed to its peak heat.
- 🔥 Ablation: Some shields melt away to carry heat away from the ship.
- 🔥 Blackout: Ionized gas blocks all communication for ~7 minutes.
Shield Materials
The Thermal Barrier. Whether through the sacrifice of an ablative resin or the extreme insulation of a ceramic tile, these materials prevent the spacecraft's aluminum or steel skin from melting.
- ▦ Thermal Conductivity: Near zero (Stops heat transfer).
- ▦ Porosity: Often 90% air to minimize weight and heat path.
- ▦ Survival: Rated for 3,000°F+ (1,650°C+).
Velocity vs. Heat
The Cube Law of Re-entry. Velocity is the "Engine" of thermal stress. As speed increases, the shockwave in front of the craft compresses air more violently, turning kinetic energy into a wall of incandescent plasma.
- ⚡ LEO Entry: 7.8 km/s — Standard Thermal Load.
- ⚡ Mars Return: 12.5 km/s — Extreme Thermal Load.
- ⚡ Energy Transfer: Q v3 (Heating scales cubically).
Entry Angle (gamma)
The Precision Window. The entry angle dictates the "Density Profile" the rocket encounters. Engineers must balance the risk of Skip-out (too shallow) against the risk of Thermal Destruction (too steep).
- ∠ Steep Entry: High Peak Heat, High G-Loads.
- ∠ Shallow Entry: Lower Heat, Risk of Atmospheric Skipping.
- ∠ Control: Capsules use an offset center of mass to "fly" through the air.
Guidance Failure
When the math fails, Aerodynamics takes over. A deviation of just 1 degree can shift the peak thermal load by thousands of Kilowatts. In these scenarios, the spacecraft either becomes a permanent satellite or a falling star.
- ✖ Skip-Out: Insufficient drag for orbital capture.
- ✖ Ballistic Re-entry: High-G descent due to steep angle.
- ✖ Thermal Breach: Heat Oat exceeds material limits.