Design And Aerodynamics Research Of Transonic Zero-staging A Multistage Axial Flow Compressor

With the development of science and technology, large-flow and high-ratio compressors are eagerly needed. There are a lot of compressors which have good performance in service, but these compressors cannot satisfy the new requirements. Simultaneously to design and manufacture a new compressor costs much more. Zero-staging is an effective way to increase the compressor pressure ratio as well as its mass flow. Furthermore zero-staging could shorten the design cycle, increase design reliability and reduce design cost of a new multi-stage compressor.Based on similarity and modeling theory, the best match point is sought firstly from original compressor characteristic. Then the pneumatic parameters at the matching section are obtained and the design requirements about the transonic compressor zero-stage are brought out. According to the zero-stage design requirements, ID through-flow design is executed and Quasi-3D design based on S1/S2stream surface theory is carried out. Lastly, a parametric modeling of the compressor zero-stage is completed.Under the same matching conditions, an optimization design about meridional flowpath, blade profile, blade number and blade chord length is performed using the commercial software NUMECA. The optimum geometry parameters of compressor zero-stage are gained. The final compressor zero-stage performance is compared to the original compressor and the flow angles as well as flow velocities at compressor zero-stage exit are verified to ensure the matching characteristic between the zero-stage and original compressor.Finally, a3D multi-stage numerical simulation is adopted to investigate the whole compressor performance. The new compressor performance is compared to original compressor to analysis the off-design characteristics. The studies above indicate that the resultant compressor has higher pressure ratio and larger mass flow and the zero-stage has good matching performance with the original compressor. Not only can the zero-stage improve flow condition of the original compressor but also can increase the original compressor operating stability.