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Influence of Micro-blowing technique hole parameters on drag reduction of civil aircraft engine nacelle
  • Mushfiq Al Arafa,
  • Macdonald Mutekwa,
  • Kamruzzaman MD
Mushfiq Al Arafa
Ruhr University Bochum Research School

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Macdonald Mutekwa
Nanjing University of Aeronautics and Astronautics
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Kamruzzaman MD
Nanjing University of Aeronautics and Astronautics
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Abstract

The numerical parametric analysis conducted to analyze the impact of micro-blowing technique (MBT) hole-parameters are quite few at the present stage. This paper aims to analyze the effects of micro blowing and its different hole-parameters on the skin friction drag reduction of an engine nacelle operating at cruise conditions. The primary task is to observe the flow behavior at the vicinity of the holes. The interaction between main-stream and micro-channel flow is solved, using the RANS equation and k-omega SST is used to model the turbulent flow at the wall region. The hole-pattern is aligned in a single-row channel and the hole cross-section shape is kept straight to obtain an overall simplicity of the model. The influences of the micro blowing are visible from the simulation results, as there is a significant reduction in the velocity gradient between the solid nacelle surface and all the MBT configurations. The porous nacelle surface with zero blowing velocity has less friction drag than of its solid surface, implying that the presence of the holes possesses low effective surface roughness. The optimum friction drag reduction is observed when the geometrical attributes of the holes possess small diameter and high aspect ratio.