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考虑了可控涡级内流面弯曲,通过寻找可控涡设计合适的轴向速度分布,采用给定压力分布求解环量分布的可控涡设计方法,首先对1.5级轴流亚声速试验涡轮进行了设计;然后进行参数化造型;最后运用三维黏性数值模拟,对所设计的1.5级涡轮进行了数值研究。数值结果表明:采用可控涡设计方法减缓了叶栅通道内的横向压力梯度;遏制了低能流体向吸力面堆积;消除了动叶栅根部沿径向方向的负压力梯度;降低了下通道涡涡核能量。与自由涡设计相比,可控涡设计涡轮效率提高了0.67%,功率提高了3.47%。研究还表明,采用这种压力可控涡设计方法,不仅可以提高动静叶匹配,还可以避免级后气流参数不均匀,最大程度地减少叶栅出口掺混损失。
Considering the controllable vortex flow surface bending, by looking for the controllable vortex design appropriate axial velocity distribution, the use of a given pressure distribution for the controllable vortex ring volume distribution of the design method, first of all, 1.5 axial subsonic test turbine The design of the 1.5-level turbine was carried out. Then the parametric modeling was carried out. Finally, the three-dimensional viscous numerical simulation was used to study the designed 1.5-level turbine. The numerical results show that the controllable vortex design method can reduce the lateral pressure gradient in the cascade passage, prevent the low-energy fluid from accumulating on the suction surface, eliminate the negative pressure gradient in the radial direction of the root of the cascades, Vortex nuclear energy. Compared with the free vortex design, the controllable vortex design turbine efficiency increased by 0.67%, power increased by 3.47%. The study also shows that the pressure control vortex design method can not only improve the dynamic and static blade matching, but also can avoid uneven airflow parameter after the grade, and minimize mixing loss at the exit of the cascade.