汽雾两相流在带60 肋叶片内冷通道中换热强化实验研究
Heat transfer Experimental Investigation of Mist/Steam Within Gas Turbine Blade Internal Cooling Passage With 60 angled ribs
本文主要研究了汽雾两相流冷却介质对叶片内冷通道的流动及换热强化作用。实验研究了进口 、热流密度、水雾流量等关键因素对壁面的温度分布以及换热效果的影响。实验验证了在蒸汽冷却介质中添加微小水雾对壁面冷却效果有明显提升,在高水雾流量、低壁面热流密度为3000 ,最高的 在 位置处可达1.69。受到肋角度的影响,侧壁面换热系数沿通道轴向呈现出先增大后减小,与侧壁面中心温度分布呈现先减小后增大的变化趋势相吻合。在靠近通道边角处的带肋壁面,由于热边界层较厚,主流冷却介质的扰动作用减弱,换热效果降低,在实际应用过程中需考虑肋角度对壁面换热效果的影响。
It was investigated in this paper that the fluid and heat transfer enhancement of the mist/steam two-phase flow coolant in the internal passage in the gas turbine blade. During the experiment, the wall temperature and the heat transfer efficient was studied with the influence of the number of the steam, the mass flow of the mist and the wall heat flux. The cooling effectiveness of the mist/steam two-phase flow coolant was proved to be effective after added the mist into the steam coolant. And the highest can be 1.69 under the condition of high mass flow of the mist and the wall heat flux of 3000 at . With the influence of the angled ribs, the heat transfer coefficient along with the axial direction of the passage first increased and then decreased which explained why the temperature of the heated wall first decreased and getting higher near the end of the passage. The temperature of wall with the ribs inside, near the corner of the passage, is higher than the temperature of the same wall in the middle line. The thermal boundary layer is thicker near the corner of the wall and the agitation of the coolant getting weaker, which lead to the decease of the heat transfer efficient. So when the mist/steam two-phase flow coolant applied into the real gas turbine, the influence of the ribs angle should be taken into consideration.
姜广文、史晓军、高建民
热力工程、热机蒸汽动力工程特殊热能、特殊热能机械
汽雾两相流燃气轮机内冷通道肋片强化换热实验研究
mist/steam two-phase flowgas turbineinternal cooling passageribsheat transfer enhancementexperimental investigation
姜广文,史晓军,高建民.汽雾两相流在带60 肋叶片内冷通道中换热强化实验研究[EB/OL].(2016-06-03)[2025-08-23].http://www.paper.edu.cn/releasepaper/content/201606-281.点此复制
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