Nozzel Efficiency
NOZZLE EFFICIENCY
PERCENTAGE (%)
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Nozzle Efficiency (η)
The Kinetic Transformer. Nozzle efficiency is the ratio of actual exhaust velocity to the theoretical maximum. It tells us how much "waste" is generated during the expansion process.
- ◢ Flow Geometry: Designing the "Bell" for specific altitudes.
- ◢ Thermal Loss: Heat that escapes through the nozzle walls.
- ◢ Divergence Loss: Gas that shoots out at an angle instead of straight back.
Exit Diameter (De)
The Final Expansion Point. Measured in meters, the exit diameter dictates the pressure of the exhaust gas at the moment it leaves the vehicle. It is the key to balancing Thrust against Atmospheric Drag.
- ⫸ Areal Ratio: The math between the throat and the exit.
- ⫸ Flow Separation: A risk if the exit is too wide for the air pressure.
- ⫸ Gimbaling: Large exit diameters make steering more complex.
Throat Diameter (Dt)
The Critical Orifice. The throat diameter is the primary variable that controls the Mass Flow Rate of the propellant. It is the most thermally stressed component in the entire vehicle.
- ⫸ Sonic Flow: The point where gas reaches Mach 1.
- ⫸ Chamber Pressure (Pc): Regulated by throat area.
- ⫸ Ablative Cooling: Often used to protect this specific zone.
Ideal Exhaust (Ve)
The Theoretical Maximum. Ideal Exhaust velocity is the speed the gas would reach if the nozzle expanded into a perfect vacuum with zero friction. It is the gold standard for Propulsion Efficiency.
- ⚡ Chemical Potential: Defined by the fuel's energy density.
- ⚡ Molecular Weight: Lighter gases move faster at the same temp.
- ⚡ Limit: The "Infinite Expansion" velocity.
Actual Exhaust
The Delivered Momentum. This is the true velocity of the gas as it exits the nozzle plane. It accounts for boundary layer friction, chemical kinetics, and pressure imbalances.
- ≋ Boundary Friction: Energy lost to the nozzle walls.
- ≋ Pressure Loss: Back-pressure from Earth's atmosphere.
- ≋ Net Thrust: The actual "push" felt by the vehicle.