Abstract
Based on the aerodynamic matching configuration between a core driven fan stage (CDFS) and high pressure compressor (HPC), matching state point correlation equations have been established in this paper. The radial nonuniformity of the CDFS outlet flow and the aerodynamic loss caused by complex flow structure between these two components are taken full account in the equations, and a high-accuracy prediction program for matching performance has been developed. Based on the experimental performance data of two components, matching performance prediction at given bypass ratio is made and compared with experimental results. The results show that: 1) The outlet temperature of CDFS varies with its state points change, which makes the relative corrected rotation speed of HPC in matching environment change, and the characteristic line of HPC is not based on the same relative corrected rotation speed. 2) The difference exists between the matching performance prediction results and experimental results. One reason is that CDFS performance varies in the component environment and the matching environment due to the different back pressure regulation modes; another reason is that this prediction method doesn’t consider the effect of the CDFS’s outlet flow nonuniformity on the HPC’s performance, but the maximum relative deviation of the flow rate is only 0.74 %.
Nomenclature
- W
mass flow rate (kg/s)
- G
corrected flow rate (kg/s)
- N
design corrected rotational speed (r/min)
- π
total pressure ratio
- η
adiabatic efficiency
- τ
total temperature rise ratio
- T
total temperature (K)
- P
total pressure (kPa)
relative corrected rotational speed
physical rotation speed
total pressure recovery coefficient
Superscript/Subscript
- C
core driven fan stage （CDFS）
- H
high pressure compressor （HPC）
- CH
the matching between CDFS and HPC
- D
design point
- ci
the inlet section of CDFS
- co
the outlet section of CDFS
- hi
the inlet section of HPC
- ho
the outlet section of HPC
- bi
the inlet section of bypass
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