三级有机工质离心透平气动性能研究

以有机工质R123为工质,基于一维气动分析理论,设计了三级离心透平,并采用数值模拟方法研究了不同工况下的透平气动性能.结果表明:设计工况下,三级等叶高直叶片离心透平轮周效率可达到86.7%;在变工况条件下,离心透平轮周效率随着膨胀比的增大先增大后减小,离心透平各级的膨胀比、焓降和反动度等热力参数随着级组膨胀比的变化从高压级到低压逐级增大,最末级变化最大.

The aerodynamic analysis on the three stages centrifugal turbine of organic working fluid

Based on one dimensional aerodynamic analysis theory, a three-stage centrifugal turbine was designed by using R123 as working fluid. The aerodynamic performance of the centrifugal turbine was studied by numerical simulations. Numerical results showed that the circumferential efficiency of the three-stage centrifugal turbine with equal blades and high straight blades can reach 86.7% under design conditions. Under the off-design conditions, the efficiency increases initially with increasing expansion ratio, reaches a maximum and then decreases. The thermal parameters such as expansion ratio, enthalpy drop and reaction degree of each stage of centrifugal turbine increase from high pressure stage to low pressure stage with the change of expansion ratio of each stage group, and the last stage changes the most.