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What problems can occur from improper combustion chamber sealing? 

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Predicted results indicate that the partial closures may generate substantial local pressure peaks along the crack, implying a strong coupling between chamber pressurization, crack combustion, and propellant deformation, especially when cracks are narrow and chamber pressurization rates are high.
In conclusion, the proposed model served as a robust tool to evaluate different parameters on the sealing capacity of the combustion chamber that contribute to minimizing global emissions.
The results showed that for complete sealing, the earlier the initial sealing time is, the better the fire can be suppressed with a shorter burning duration and lower temperature.
The possible depression effect related to the fuel area of sealing on combustion was observed in the experiment.
Moreover, the sealing interference, among several other factors, greatly affects the life of the sealing ring.
Our results indicate significant differences in sealing integrity due to chamber-collar sealing strategy.
Results of the analyses show that combustion instabilities occur in all the experimental operating conditions.
It was found that heat transfer has an important effect on the combustion dynamics when the flame interacts with the sidewalls of the chamber.
Numerical analysis reveals that the differences in flame blowout limits are a result of the combined effects of heat recirculation and local flow field at the entrance of the combustion chamber.

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