Question

1. List and summarize the methods of controlling flame-holding instability.

2. How is throttling on a hybrid rocket motor achieved?

3. List several of the applications in which hybrid propulsion is a good fit.

4. Explain why rocket motors never reach thermal equilibrium during firing.

5. Using the text/online sources, discuss the type(s) of nozzles used by the STS's solid rocket boosters.

6. Why are high-strength alloy (HY) steels preferred for motor casings?

Answer 1

1. Method for controlling flame-holding instability comprising :

A) activating a system comprising a combustor and a nozzle coupled to and insulated from the combustor to generate and electric field and to form a flame

B) detecting a pressure in combustor

C) determining a primary frequency and a mean peak pressure of the detected pressure

D) if mean peak pressure exceeds a maximum endurable pressure then generating an alternating current signal having a frequency equal to the primary frequency of detected pressure and a phase difference of 180 degree

E) if mean peak pressure continues to exceed maximum endurable pressure , increasing the phase difference of alternating current signal that is generated.