摘要
基于相似理论为某一三级轴流式低速压气机增加一个高效零级使压气机流量增加了12.5%,同时达到增加压比的目的。由于流动缺陷集中在静叶上,利用三维粘性计算流体力学(Computational fluid dynamics,CFD)技术对静叶进行重新改型设计:采用可控扩散叶型(Controlled diffusion airfoil,CDA)控制叶片表面速度分布,控制了叶片表面附面层厚度,尾缘逆压梯度减小,很大程度减小了叶栅后半部分的三维分离;为进一步缓解端壁处的低能流体堆积,采用端弯技术,在改善端区流动的同时也很好的改善与原机的匹配,提高零级性能,最终提高新型压气机的效率,达到设计要求。同时分析加零级前后压气机特性曲线,证实喘振裕度得到了保证,分析进出口气流角表明加级后原机部分仍然保持原来的相似运行条件。
The aerodynamic design of a new front stage for a three-stage axial-flow low-speed compressor based on the similarity theory is described,in order to increase the flow by 12.5% and the total pressure ratio.The design and optimization are carried out by using a 3D-viscocity controlled diffusion airfoil(CFD) technology on stator.The new computational fluid dynamics(CDA) profile is adopted to control the profile losses and adverse pressure gradient at trailing areas,so the three dimensional separation is reduced greatly.End-bending technology is also used to further mitigate the accumulation of low-energy fluid at stator end wall.It improves not only the flow at end zone but also the matching between the front stage and the base one,and enhances the zero-stage performance to arrive the design target.It is found that the surge margin is ensured by analyzing the characteristic curves and the base one keeps the similitude operating conditions by comparing the flow angles.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2011年第6期160-167,共8页
Journal of Mechanical Engineering
关键词
相似理论
零级
可控扩散叶型
端弯
匹配
喘振裕度
Similarity theory Zero-stage Controlled diffusion airfoil(CDA) End-bending Match Surge margin
