Numerical Simulation of Back-Side Cooling Enhancement of Huels Type Arc Heater Electrode
Strengthening the back-side heat transfer of the electrode is an effective way to reduce its temperature and erosion.In this paper,the coupling calculation of solid heat transfer,fluid heat transfer and turbulent flow is car-ried out by using COMSOL for the electrode back-side cooling of 10MW huels type arc heater,the electrode tempera-ture and the resistance coefficient of cooling channel with different rectangular rib coefficient and surface roughness on the back side are obtained,at the same time,the expression of the comprehensive influence of rib coefficient and sur-face roughness on inner wall temperature of electrode at the placement of arc foot and resistance coefficient of cooling channel are obtained respectively by regression analysis of the simulation data.The results show that when the rib co-efficient increase in the range of 1-2.2,the inner wall temperature of electrode at the placement of arc foot decreases monotonically with a range of 12-14%and the flow resistance coefficient of cooling channel of the electrode increases monotonically with a range of 26.3-46.9%.Moreover,the influence of rib coefficient on the resistance coefficient is more obvious with higher roughness.When the roughness increases from 3.2um to 80.6um,the inner wall temperature decreases with a range of 6.5-11%and the resistance coefficient has almost doubled.However,the effect of increas-ing roughness on reducing the electrode temperature decreases gradually with the increase of roughness.The expres-sions obtained by regression analysis can be used to estimate the inner wall temperature of electrode and resistance coefficient of cooling channel with different rib coefficient and roughness on the back side.
Huels type arc heater electrodeBack-side coolingRib coefficientRoughnessNumerical study
万方数据
维普
