Temperature Approximation of Rocket Motor Casing

1
Temperature Approximation of Rocket Motor Casing

• Greg Metzgar
• Joseph Wahlquist

2
The Question

• Will the motor casing reach a temperature at
  which it will fail?

3
Known

• Flame Temperature Inside Rocket
• Geometry
• Velocity of Rocket

4
Analysis

• Stress on motor casing was found using thick wall
  pressure vessel theory
• Critical temperature was found (the temperature
  at which Yield Strength is equal to the Applied
  Stress)
• Tcr623 K

5
Analysis

• Four simultaneous equations were created to
  represent the system
• These equations were solved using excel
• Casing Temperature
• Found to be 386 K

OUTER WALL
CASING WALL
FUEL
OPEN SPACE
Tcr
T3
6
Experiment

• Selected Thermocouple
• CHAL 005 max service Temp 866 K response time
  0.04 sec
• Attached to data storage
• system onboard the rocket

7
Conclusion

• The motor will not explode because of failing
  motor casing walls