化工学报2023，Vol.74Issue(11)：4515-4526,12.DOI:10.11949/0438-1157.20230985
跨临界CO2两相流可调式喷射器的流动模拟和性能分析
Flow simulation and performance analysis of adjustable ejector for trans-critical CO2 two-phase flow
摘要
Abstract
As an important energy-saving component of the CO2 refrigeration/heat pump system,the working ability of the ejector has an important impact on the improvement of system performance.Despite the structural simplicity of the CO2 ejector,its internal flow is intricate and encompasses physical phenomena like non-equilibrium phase transitions,transonic and Mach waves.To this end,a homogeneous relaxation model(HRM)for two-phase flow of CO2 was developed in this study,and the reliability of the model was verified by experimental data,from which a numerical study of the adjustable ejector was conducted to analyze the effects absence or presence of needle,needle position,and operating condition variations on the performance and internal flow of the adjustable ejector.The results demonstrate that the needle increases the irreversible loss of the primary flow and also alters the expansion state of the primary flow at the nozzle outlet.By adjusting the nozzle throat area through the needle,it improves the ability of the ejector to adapt to different operating conditions,so that the ejector maintains the optimal running state under different conditions.Consequently,compared with fixed ejectors,adjustable ejectors exhibit an average efficiency improvement of 10.74%.关键词
可调式喷射器/CO2/均相弛豫模型/两相流/计算流体力学Key words
adjustable ejector/CO2/homogeneous relaxation model/two-phase flow/computational fluid dynamics分类
能源科技引用本文复制引用
陈壮,刘光弟,曾宏轩,赵红霞..跨临界CO2两相流可调式喷射器的流动模拟和性能分析[J].化工学报,2023,74(11):4515-4526,12.基金项目
国家自然科学基金项目(51776110) （51776110）
