Method for Handling Turbulent Fluctuation in Radiative Heat Transfer in Furnaces (Proposal of Efficient Method and Examination Based on Absorption Line Database)

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概要

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• An effective method is proposed for handling turbulent fluctuations of temperature and partial pressure of infrared-active gas in order to evaluate radiative heat transfer under the influence of turbulence-radiation interaction with fair accuracy and feasible calculation load, assuming large-scale industrial furnaces where the re-absorption of radiative energy by combustion gas on optical path toward objects to be heated cannot be neglected. The proposed method realizes feasible calculation load suitable to simulation tools based on two kinds of simplification. Firstly, assuming that temperature fluctuations of arbitrary two positions are independent from each other, local emission of radiative energy from turbulent combustion gas is treated as steady emission though its value is evaluated by averaging the fluctuating intensity corresponding to turbulence. Secondly, absorption of radiative energy by turbulent combustion gas on the optical path is evaluated based on the steady spatial distribution of absorption coefficient in correspondence to spatial distribution of time-averaged temperature. Validity of the proposed method is examined on a model optical path imaging the typical course of radiative energy in large-scale industrial furnaces. H2O is selected as fuel taking the reliability of absorption line database into consideration. Examination results indicate that the validity of proposed method is secured even if the cross-correlation of temperature fluctuation extends over realistic distance and even if the fluctuation intensity is fairly large. The error attendant to proposed method is sufficiently smaller than the error raised by entire neglect of turbulent fluctuation of temperature and gas composition.

著者

• 竹内 誠一

  京都工芸繊維大学

• 岡本 達幸

  京都工芸繊維大学

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