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首页> 外文期刊>Thermal engineering >Calculating the Parameters of Self-Oscillations in the Vertical Combustion Chamber of the Blast-Furnace Air Heater during Unstable Combustion
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Calculating the Parameters of Self-Oscillations in the Vertical Combustion Chamber of the Blast-Furnace Air Heater during Unstable Combustion

机译：不稳定燃烧时高炉空气加热器垂直燃烧室内自激振荡的参数计算

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摘要

A procedure for simplified calculation of the parameters of self-oscillations excited during unstable (vibrating) combustion in the vertical combustion chambers of blast-furnace air heaters is developed. The proposed procedure is based on an independent nonlinear dynamic system similar to the equations from the theory of a blade supercharger stalling and surging mode. The head characteristic considered in the blade supercharger stalling and surging theory determines the part of the supercharger drive rotation energy that is converted into the head developed by the supercharger. In the considered system, the supercharger head characteristic is replaced by the combustion chamber head characteristic. Being a function of flow rate, this characteristic describes the part of heat supplied to flow that is converted to the flow head. Unlike the supercharger head characteristic, which is determined by experiment, the combustion chamber head characteristic is determined by calculation, due to which it becomes much easier to calculate the parameters of self-oscillations according to the proposed procedure. In particular, an analysis of the periodic solutions of the obtained dynamic system made it possible to determine the pattern in which the amplitude of considered self-oscillations depends on the surge impedance of the vertical combustion chamber.
机译：开发了简化计算高炉空气加热器的垂直燃烧室中不稳定（振动）燃烧过程中激发的自激振荡参数的程序。所提出的程序基于一个独立的非线性动力学系统，该系统类似于叶片增压器失速和喘振模式理论中的方程。叶片增压器失速和喘振理论中考虑的机头特性决定了增压器驱动旋转能量的一部分，该部分转化为增压器产生的机头。在所考虑的系统中，增压器头特性被燃烧室头特性代替。作为流量的函数，此特性描述了提供给流的热量的一部分，该热量转化为流头。与通过实验确定的增压器头部特性不同，通过计算来确定燃烧室头部特性，因此，根据提出的程序来计算自激振动的参数变得容易得多。特别地，对所获得的动力系统的周期解的分析使得可以确定其中所考虑的自激振荡的幅度取决于垂直燃烧室的喘振阻抗的模式。

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