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Influence of Blade Surface Roughness on Flow Characteristics in a Linear Compressor Cascade
Ju Hyun Im(임주현),June Hyuck Sohn(손준혁),Jin Wook Kim(김진욱),Seung Jin Song(송성진) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Experiments were conducted in a linear compressor cascade to investigate influence of blade surface roughness on flow characteristics. Rotor blade surface of a land-based gas turbine compressor has been measured to investigate blade surface degradation. Centerline averaged roughness increased from 0.20μm to 5.31μm due to surface degradation. Blade roughness of the real compressor was simulated in the experiment setup by matching the roughness Reynolds number. To apply roughness on the cascade blade, emery grain is attached to the blade surfaces with doubled-sided adhesive tape. Static pressure on blade surface, total pressure loss at downstream and deviation angle are measured in cascade experiment. Turbulent separation is detected at the blade suction side and separation position moves upstream with increasing roughness. Area averaged loss coefficient increases by 232% for the k+ of 96. Area averaged deviation angle increased by 23% for the k+ of 96.