Aerodynamic Design And Performance Study Of 10KW Organic Working Medium Radial Inflow Turbine

Along with the intensification of environment pollution and energy shortage, the demand of saving energy and trying innovative way for energy use for humans in production activities is strengthening. On the one hand, clean energies such as solar energy, geothermal energy and biomass energy are entering people's horizons. On the other hand, taking advantage of industrial waste heat energy is gradually paid more attention in industrial processes. Source of heat like solar energy, geothermal energy, biomass energy and industrial waste heat energy are often characterized by large scale but widely distributed reserves, while which have low power densities and low temperatures, are hard to be utilized by traditional equipment. Through the thermal physical properties of the low boiling point of organic working medium, organic Rankine cycle power generation system provides a new train of thought for taking advantage of the low temperature heat source.In this paper, based on low quality heat sources organic Rankine cycle system for the application background, the radial inflow turbine with organic working medium is designed. Under the condition of designed power around 10 kW, this paper discusses the methods of designing and loss model for radial inflow turbine. In the design process, the design parameters were optimized globally using Genetic optimization Algorithm, and the design efficiency is up to 81.6%. And the thermodynamic calculation program was written by MATLAB software, and the efficient radial inflow turbine was designed, which meet the power demand. The flow field of turbine was simulated by Fluent software which is one of the numerical simulation software. The numerical simulation results show that the flow field of radial inflow turbine has good flow property, and the flow loss is less. Comparison the results of numerical simulation and thermal design, it is shows that the numerical simulation results are in good agreement with the thermal design and the deviation of performance parameters is within 5%.The selection of structure parameters and the structural optimization of radial inflow turbine under low power were studied. For the guide vane section, the effect the geometric relative parameters on the performance of the radial inflow turbine guide vane under three different pressure ratio conditions was studied, the result shows that, the flow losses of stator cascade increase sharply, while relative blade height is less than 0.2, so it should be avoided that relative blade height is less than 0.2. When the relative pitch of cascade is between 0.6 and 0.8, the stator cascade has good performance, so the influence of the value for relative pitch of cascade should be considered in design of stator. For the impeller part, the influence of impeller with splitter blade on the performance of the impeller was analyzed, at the same time, the structure models of impeller with splitter blade were discussed. The results show that, when the splitter blade length is between 0.7 and 0.8, the impeller has good performance. At the same time, the best installation location of splitter blade is not installed in the middle of the long blades, the impeller has better performance while the splitter blades are installed on the position which the relative value is 0.6 in the passage.