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In chemistry, and in physics, a dynamic equilibrium exists once a reversible reaction occurs. The ratio of reactants/products changes, but substances move between the chemicals at an equal rate, meaning there is no net change. Reactants and products are formed at such a rate that the concentration of neither changes. It is a particular example of a system in a steady state. In thermodynamics, a closed system is in thermodynamic equilibrium when reactions occur at such rates that the composition of the mixture does not change with time. Reactions do in fact occur, sometimes vigorously, but to such an extent that changes in composition cannot be observed. Equilibrium constants can be expressed in terms of the rate constants for elementary reactions.
An analysis method and system for laminar diffusion jet flame stability
This invention discloses a method and system for analyzing the steady-state of a laminar diffusion jet flame, relating to the field of gas turbine combustion technology. The method includes: obtaining the instantaneous propagation velocity of the laminar jet diffusion flame when the flame root reaches its final stable position during propagation towards the nozzle. S d and the local airflow velocity at that location U G ;according to S d and U G Determine the instantaneous combustion rate; compare the instantaneous combustion rate with... U G If the difference between the two is within a preset range, it indicates that the combustion rate and the local airflow velocity are in dynamic equilibrium, and it is determined to be a pusher flame; if the instantaneous combustion rate is greater than 1, it indicates that the combustion rate and the local airflow velocity are in dynamic equilibrium, and it is determined to be a pusher flame. U G If the difference exceeds a preset range, it indicates that the flame propagation and the extinction caused by heat loss are in equilibrium, and the flame is identified as an attached flame. This invention achieves precise identification of the flame's stable state by quantifying the comparison between combustion rate and airflow rate, providing a quantitative basis for combustion adjustment and significantly reducing operational blindness and time costs. A corresponding analysis system is also provided.
Owner:XIAN THERMAL POWER RES INST CO LTD +1