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Alessandro CORSINI , Bruno Perugini

Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signatures Colchester, June 7 2006. Alessandro CORSINI , Bruno Perugini. TMRGroup @ DMA-URLS. Università di Roma "La Sapienza".

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Alessandro CORSINI , Bruno Perugini

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  1. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signatures Colchester, June 7 2006 Alessandro CORSINI, Bruno Perugini TMRGroup @ DMA-URLS Università di Roma "La Sapienza"

  2. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature evidences from Corsini et al., 2006 (GT2006-90592) AC/90/6/TF AC/90/6 D: 7 m³/s Tip device reduces vortex rotational energy Helicity magnitude is reduced for AC/90/6/TF. Unlike AC/90/6/TF shows helicity sign inversion due to tip vortex breakdown. TMRGroup @ DMA-URLS Colchester, June2006

  3. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature evidences from Corsini et al., 2006 (GT2006-90592) AC/90/6/TF AC/90/6 D: 7 m³/s Stagnation point followed by bubble-type recirculating flow. Bubble-type breakdown with high loss core TMRGroup @ DMA-URLS Colchester, June2006

  4. nc wn vL sc Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature Remark 1: vortex breakdown in AC90/6/TF is not correlated to leakage mass flow rate Remark 2: a correlation exists between the TLV dimension&energy contents (vortex image) and the amount of leakage flows required for the feeding Remark 2.1: the TLV status is defined by the global flow coefficient (i.e. higher flow rate = higher energy to sustain the vortex development) Remark 2.2: TLV depends on the gap height, on the local incidence angle @ the tip D operating point P operating point TMRGroup @ DMA-URLS Colchester, June2006

  5. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature • The re-design of end-plate moves from the requirement of avoiding the • occurence of vortex breakdown • Three approaches have been followed: • modification of tip feature thickness distribution according to safe Rossby • number gradient concept – TFvte (TF variable thickness end-plate); • modification of tip jet energy content at the leading edge geometry – TFcle • (TFwith circular leading edge); • modification of tip gap by virtue of a mixing enhancer concept – TFrtg (TF • with recessed tip gap). TMRGroup @ DMA-URLS Colchester, June2006

  6. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature Tip configurations datum tip geometry, FW July 2005 tip feature thickness modification circular leading edge datum geometry with stepped or recessed tip feature TFvte TFcle TFrtg TMRGroup @ DMA-URLS Colchester, June2006

  7. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature Helicity Rossby number gradient concept, fan AC/90/6/TFvte AC/90/6/TFvte AC/90/6/TF TMRGroup @ DMA-URLS Colchester, June2006

  8. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature Turbulence Intensity Rossby number gradient concept, fan AC/90/6/TFvte AC/90/6/TF AC/90/6/TFvte TMRGroup @ DMA-URLS Colchester, June2006

  9. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature Rotor losses Rossby number gradient concept, fan AC/90/6/TFvte AC/90/6/TF AC/90/6/TFvte TMRGroup @ DMA-URLS Colchester, June2006

  10. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature Leading edge tip jet control, fan AC/90/6/TFcle TMRGroup @ DMA-URLS Colchester, June2006

  11. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature fan AC/90/6/TFcle vs AC/90/6/TFvte TMRGroup @ DMA-URLS Colchester, June2006

  12. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature Mixing enhancer concept, fan AC/90/6/TFrtg TMRGroup @ DMA-URLS Colchester, June2006

  13. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature fan AC/90/6/TFrtg vs AC/90/6/TFvte (i) losses TMRGroup @ DMA-URLS Colchester, June2006

  14. Development of new tip end-plate geometries for improved aerodynamics and aeroacoustics signature fan AC/90/6/TFrtg vs AC/90/6/TFvte (ii) normalized helicity distributions TMRGroup @ DMA-URLS Colchester, June2006

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