平衡相和非平衡相模型在超音速引射器流场计算中的对比研究  

Comparative Study of Equilibrium Phase and Non-equilibrium Phase Model in Supersonic Ejector Flow Field Calculation

作　　者：覃乃朋 蔡林[2] Tan Nai-peng;Cai Lin

机构地区：[1]广西壮族自治区特种设备检验研究院,广西南宁530200 [2]武汉大学动力与机械学院,湖北武汉430072

出　　处：《化工设计通讯》2018年第5期150-152,共3页Chemical Engineering Design Communications

摘　　要：蒸汽引射器是热力系统中常用的动力装置。分别采用平衡相模型和非平衡相模型,对某超音速蒸汽引射器的流场进行了数值计算和对比分析。建立了描述引射器内蒸汽流动的NS方程组,并引入SST-kw湍流模型进行封闭。平衡相模型仅考虑蒸汽流动的湿度变化,非平衡相模型基于经典成核理论,考虑蒸汽的自发凝结。将两种模型与Moore的喷管实验结果进行了对比,随后分别对某型超音速引射器的流场进行了计算和分析。结果表明:由于湿蒸汽的过饱和特性,使得非平衡相模型的计算结果温度场略低于平衡相模型,引射系数计算值高于平衡相模型。Steam ejector is a power device commonly used in thermal system.In this paper,the flow field of a supersonic steam ejector is numerically calculated and compared by using the equilibrium phase model and the non-equilibrium phase model.A NS equation describing the steam flow in the ejector is established,and the SST-kw turbulence model is introduced to seal it.The equilibrium phase model only considers the humidity change of steam flow.The non-equilibrium phase model is based on classical nucleation theory,considering the spontaneous condensation of steam.The two models were compared with the nozzle experiment results of Moore,and then the flow field of a supersonic ejector was calculated and analyzed.The results show that the temperature field of the non equilibrium phase model is slightly lower than the equilibrium phase model,and the calculation value of the ejection coefficient is higher than the equilibrium phase model because of the supersaturation of the wet steam.

关 键 词：引射器 CFD 非平衡相 平衡相 蒸汽流动 

分 类 号：TJ95[兵器科学与技术—武器系统与运用工程]