Investigation On Aerodynamic Design And Analysis Of Wear Performance For Radial Flow Turbine

Radial turbine, as a small heat-work conversion unit, is widely used in lots of fields. Radial turbine, for example, is the most important component of small gas turbines and the application areas of such turbines includes distributed power generation system, hybrid vehicles, subsidiary power generation of military vehicles and so on. During our country's 13 th Five-Year plan period, it decided to take more resource to develop the technology of distributed power generation system, so it is meaningful to do the research of radial turbine. This dissertation investigates the project design of radial turbine, three dimension modeling and the effect of particle diameter on erosion wear performance of radial flow turbine. The detailed work include that:1. After doing the research on the basis of various factors on degree of reaction and speed ratio limit of the radial turbine, put forward a reasonable method of choosing degree of reaction and speed ratio for the micro gas turbine. A one-dimension aero-thermal preliminary code OCC was programmed by the software Matlab. The design value for a 600 KW radial turbine nozzle and blade using the OCC method were compared with the value by the OFC method in the literature. Fine out that the main parameters were almost the same, and the efficiency of the radial turbine designed by the OCC is larger than that by the OFC. Then, after computing through the Fluent, the comparators between the OCC values and CFD results shows that the values were in agreement. This can prove that the one-dimension code OCC can reach our standard.2. The mentality of designing based on two-dimension, doing research on the method of designing and summarizes the method to design the volute, then writing the volute design calculation program in the Matlab software. To design two kinds of volute according to whether the radial turbine has the nozzle or not, then make two kinds of three-dimension models, import to the computing software to do the numerical simulation. To prove that design are verified.3. Doing numerical simulation for the two kinds of 600 KW whole radial turbine, including inlet volute, all the passages of nozzle and rotor blade. The performance and flow characteristics of the whole radial turbine has been analyzed. The numerical simulation includes that the liquidity of the radial turbine is good.4. In order to investigate the effect of particle diameter on erosion wear performance of radial flow turbine without nozzle. Release five groups of solid particles with different diameters, using DPM model in Fluent software. Analyze the results and we can find out the erosion condition of all the flow component of the radial turbine caused by solid particles.5. Doing research on effect of particle diameter on erosion wear performance of radial flow turbine with nozzle. Also analyze erosion condition of all the flow component of the radial turbine caused by solid particles. Then compare the results between the two structures.