Simple, stable and reliable modeling of gas properties of organic working fluids in aerodynamic designs of turbomachinery for ORC and VCC

[摘要] A simple, stable and reliable modeling of the real gas nature of the working fluid is required for the aerodesigns of the turbine in the Organic Rankine Cycle and of the compressor in the Vapor Compression Cycle. Although many modern Computational Fluid Dynamics tools are capable of incorporating real gas models, simulations with such a gas model tend to be more time-consuming than those with a perfect gas model and even can be unstable due to the simulation near the saturation boundary. Thus a perfect gas approximation is still an attractive option to stably and swiftly conduct a design simulation. In this paper, an effective method of the CFD simulation with a perfect gas approximation is discussed. A method of representing the performance of the centrifugal compressor or the radial-inflow turbine by means of each set of non-dimensional performance parameters and translating the fictitious perfect gas result to the actual real gas performance is presented.

[发布机构] Turbomachinery and Engine Technology Department, IHI Corporation, 1, Shin-nakahara-cho, Isogo-ku, Yokohama; 235-8501, Japan^1

[效力级别] 工业技术 [学科分类] 工业工程学

[关键词] Aerodynamic designs;Design simulations;Organic Rankine cycles;Organic working fluid;Performance parameters;Radial inflow turbine;Reliable models;Vapor compression cycle