![]() This process is experimental and the keywords may be updated as the learning algorithm improves. ![]() These keywords were added by machine and not by the authors. The instability of such weakly coupled systems is of considerable scientific interest but does not possess direct relation with the instability of combustion in a rocket motor where the combustion is strongly coupled to its environment. The unstable oscillations are present in a broad band rather than a few selected frequencies. The instability of small disturbances (often referred to as Tollmien-Schlichting waves) is an inherent property of the flow of the combustible mixture. A good example of this is the transition of a flame in open atmosphere from the laminar to the turbulent state. If an unstable combustion system is weakly coupled with the environment, a new equilibrium state of combustion will be reached without modifying the surroundings appreciably. A system is unstable if the amplitude increases with time. A system is stable if a disturbance introduced into the system decreases in amplitude with time and eventually becomes lost in the random fluctuations prevailing in the system. Temporal variations in a combustion system are always present and take varieties of forms and intensity under different environments.
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