高负荷氦气压气机叶栅和级性能研究

发布时间：2018-02-24 12:14

本文关键词： 氦气压气机新型基元级大转折角高负荷叶栅三维级　出处：《中国舰船研究院》2011年硕士论文　论文类型：学位论文

【摘要】：由于工质的差异性,采用空气常规设计方法的氦气压气机存在单级压比过小的问题。经验证,适用于氦气的大转折角叶型叶栅可使级负荷成倍增加;氦气压气机采用新型基元级设计方法,实现了提高压比,减少级数的目的。本文采用NUMECA的Fine/turbo软件包对5个参变量组合构成的324种新型平面叶栅进行了数值模拟研究,对结果数据进行关联研究,并得到了各参数反映损失规律性的最佳方案,在此基础上,计算了5个参量组合下162种新型基元级的性能。研究结果表明:常规设计下的扩压因子反映叶栅损失的规律在高负荷叶栅下不再适用;相同损失系数条件下,存在一个临界进气角使气流转折角达到最大,该临界进气角几乎仅与稠度相关;在较大稠度时,叶型最大厚度比变化对损失的影响十分可观,应用薄叶型很有利;新型基元级负荷得到大幅度提升,并且级效率还能维持在较高的水平。基于平面叶栅和基元级数值计算数据,设计了高负荷三维级和与之对比的常规三维级,并进行三维级数值模拟,模拟结果显示:该新型设计下的三维级方案是可行的,一个高负荷三维级设计方案:中径的马赫数0.465、能量头系数1.0、流量系数1.141、反动度0.5、稠度1.475,设计点的级压比达到1.1388,级效率达到89.86%,90%设计流量点的级压比和级效率为1.137和90.05%,110%设计流量点的级压比和级效率为1.139和88.99%,而作为比较的常规设计方案:中径的马赫数0.281、能量头系数0.419、流量系数0.5998、反动度0.5、稠度1.475,设计点的压比为1.067,效率为87.78%。
[Abstract]:Because of the difference of working fluid, the single stage pressure ratio of helium compressor with conventional air design method is too small. It has been proved that the cascade with large turning angle suitable for helium gas can double the stage load. The helium compressor adopts a new design method of elementary stage, which can increase the pressure ratio and reduce the number of series. In this paper, a numerical simulation study of 324 new types of planar cascades composed of five parameter combinations is carried out by using NUMECA's Fine/turbo software package. The correlation of the result data is studied, and the optimal scheme for each parameter to reflect the regularity of loss is obtained. On the basis of this, the performance of 162 new types of elementary classes with five parameter combinations are calculated. The results show that the rule of diffuser factor reflecting cascade losses under conventional design is no longer applicable under high load cascade conditions, and under the same loss coefficient conditions, The existence of a critical inlet angle makes the air flow turning angle reach the maximum, and the critical inlet angle is almost only related to the consistency, and the change of the maximum thickness ratio of the blade shape has a considerable effect on the loss when the consistency is large, and the application of the thin blade type is very favorable. The new elementary class load has been greatly improved, and the stage efficiency can be maintained at a higher level. Based on the numerical calculation data of plane cascade and elementary level, the high load three dimensional stage and the conventional three dimensional stage are designed and compared. The simulation results show that the three dimensional stage scheme under the new design is feasible. A high load 3D design scheme: Mach number of middle diameter 0.465, energy head coefficient 1.0, flow coefficient 1.141, reaction degree 0.5, consistency 1.475, design point pressure ratio 1.1388, grade efficiency 89.8690%, stage pressure ratio and stage efficiency 1.137 and 1.137. The grade-pressure ratio and stage efficiency of the design flow point are 1.139 and 88.99 respectively. The conventional design schemes are: Mach number 0.281, energy head coefficient 0.419, flow coefficient 0.5998, reactiveness 0.5, consistency 1.475. the pressure ratio of design point is 1.067, and the efficiency is 87.78%.
【学位授予单位】：中国舰船研究院
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH45

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