分流叶片长度及周向偏移量对ORC向心透平性能的影响

Using splitter blades can effectively improve flow blocking problem in blade channel and reduce flow loss. Aiming at an ORC radial inflow turbine with certain splitter blades, the influence of different splitter blade lengths and circumferential offset on turbine performance was studied. And internal flow conditions, blade load and loss distribution were analyzed by numerical simulation of different blade layout schemes. Results show that the splitter blade can effectively weaken the vortex in the channel, improve the flow condition, and make the pressure distribution inside the channel reasonable. At the same time,it can share part load of the main blade to a certain extent. Compared with the length of the splitter blade, the influence of circumferential offset on the distribution of entropy yield is obvious. With the increase of length and circumferential offset, the high entropy yield range and total pressure loss coefficient show a trend of first decreasing and then increasing, and the change of isentropic efficiency is the opposite. When l=0.5 and d=0.5, the isentropic efficiency is the largest by 91.26%, and the power is roughly positively correlated with blade length. When the length coefficient and circumferential offset are controlled between 0.5-0.6, the ideal flow condition and blade load distribution can be maintained, and the high entropy yield range is small, which is conducive to the improvement of turbine performance.