摘要
氦气压气机如果采用常规的空气压气机设计规律，则其单级压比小、级数过多。因此，对一种适用于氦气的大转折角叶型的速度三角形进行了分析介绍，在对所选湍流模型和网格划分首先进行了校准的基础上，采用Fluent流体分析软件对氦气大转折角叶栅流场进行了数值模拟。数值模拟结果显示：与常规设计相比，当进口马赫数为0．466～0．7013时，此大转折角叶型基元级的加功量可以成倍地增加，从而成倍的减少氦气压气机的级数，而叶型效率仍可达到0．939—0．894；流场基本没有出现分离现象。
For a helium compressor, if the law for designing a conventional air compressor was adopted, its pressure ratio in any single stage would be small and an excessively large number of stages shall be required. To this end, a speed triangle at a big deflection angle applicable for helium was analyzed and described. On the basis of a calibration first conducted of the turbulent flow model and mesh division being chosen, the fluid analytic software Fluent was employed to perform a numerical simulation of the helium flow fields in the cascades with a big deflection angle. The numerical simulation results show that compared with the conventional design, when the inlet mach number ranges from 0.466 to 0.7013, the power increment of the elementary stage designed by using the blade profile under discussion can be in- creased several times, thus reducing several times over the number of stages in the helium compressor while the efficiency of the blade profile still attains from 0.939 to 0.894. Basically, no separation phenomena emerge in its flow field.
出处
《热能动力工程》
CAS
CSCD
北大核心
2010年第B06期6-11,共6页
Journal of Engineering for Thermal Energy and Power
关键词
氦气压气机
级压比
速度三角形
CFD
helium compressor, stage pressure ratio, speed triangle, CFD （computational fluid dynamics）
