摘要
为研究超临界水煤气制氢技术中所用混合工质透平低压级内的非平衡凝结流动特性和激波演化规律,建立了二维叶栅通道,设置CO_(2)质量分数为0%,10%,20%,30%,40%5种不同组分混合工质,采用自编程的双组分凝结模型对透平低压区H_(2)O/CO_(2)混合气体进行数值模拟,研究二维叶栅内混合工质凝结流动特性及伴随的激波效应。结果表明:CO_(2)作为不凝气体对混合工质的凝结产生了抑制,CO_(2)组分含量从0%增加到40%过程中,混合工质中的H_(2)O分压逐步减小,凝结速度减慢,凝结位置向后移动,液滴增长区域面积减少了37.56%,流道最大湿度从0.0486降低到0.0287;CO_(2)组分含量增加使得水蒸气凝结量减少,释放凝结潜热产生的压力脉动减小,对气动激波的干涉作用减弱,叶栅通道内激波效应增强;CO_(2)组分含量的不同会引发水蒸气凝结位置的变化,凝结压力脉动的位置也随之改变,最终导致叶栅尾缘激波形态发生改变。
To investigate the condensation flow characteristics and shock wave evolution law in the lowpressure stage of mixed working fluid turbines for supercritical water gasification hydrogen production technology,a two-dimensional cascade channel was established.Five different working fluid compositions with CO_(2) mass fractions of 0%,10%,20%,30% and 40% were set up.A self-programmed two-component condensation model was employed to numerically simulate the H_(2)O/CO_(2) mixtures in the turbine low-pressure region.The condensation flow characteristics and associated shock wave effects of mixed working fluid in 2D cascade were studied.The results demonstrate that as a non-condensable gas,CO_(2) inhibits the condensation process of mixed working fluid.In the process of CO_(2) content increasing from 0% to 40%,the partial pressure of H_(2)O is reduced gradually,condensation velocity reduces,condensa tion position moves backward,the droplet growth zone area is decreased by 37.56%,and the maximum humidity in the flow path is reduced from 0.0486 to 0.0287.Increasing CO_(2) content reduces water vapor condensation quantity,and associated condensation latent heat release leads to diminished pressure pulsations that weakens the interference effect on aerodynamic shocks,thereby intensifying shock wave effects in the cascade channel.Variations in CO_(2) content alter both the water vapor condensation location and corresponding pressure pulsation position,ultimately modifying the shock wave morphology on the trailing edge of cascade.
作者
韩旭
施海波
HAN Xu;SHI Haibo(Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding,China,Post Code:071003)
出处
《热能动力工程》
北大核心
2025年第6期65-71,91,共8页
Journal of Engineering for Thermal Energy and Power
基金
河北省自然科学基金项目(E2023502025)
河北省高等学校科学研究项目青年拔尖项目(BJ2025053)
国家自然科学基金项目(52106042)
中央高校基本科研业务费项目(2024MS145)。
关键词
混合工质
跨音速叶栅
非平衡凝结
激波演化
mixed working fluids
transonic cascade
non-equilibrium condensation
shock wave evolution
