Thermal-fluid coupling simulation study on double heat source vacuum brazing process of titanium alloy plate-fin structure
The thermal-flow coupling model for vacuum brazing process of titanium alloy plate-fin structure under the coupling effect of dual heat sources of resistance heat generation and radiation heat-ing is constructed in this paper.The disparities in the temperature field between a single heat source and dual heat sources are meticulously compared and analyzed.The temperature field distribution dur-ing the vacuum brazing process of titanium alloy plate-fin structures under the influence of dual heat sources is investigated,along with the flow characteristics of the brazing filler material.The results in-dicate that the heating rate of the dual heat source is promoted due to the higher efficiency of heat con-duction compared to single heat source.When entering the final insulation stage,the resistance heating is disconnected and the temperature field distribution of the plate-fin structure under the action of dual heat sources is the same as that of the single heat source,with high temperature in the outer area and low temperature in the central area.During the whole heating process,the temperature difference of the plate-fin structure heated by single heat source is gradually increased to about 155 K.By compari-son,under the dual heat source heating,the temperature difference is decreased from a maximum of about 70 K to about 5 K with constant fluctuations.Therefore,the temperature uniformity of titanium alloy plate-fin structure is significantly improved under the combination of radiation-resistance dual heat source.Meanwhile,the distribution of brazing filler metal flow is similar to the distribution of tempera-ture field.The higher the temperature,the more sufficient the brazing filler metal melts and the better the fluidity.
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