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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2019, Vol. 40 ›› Issue (11): 123040-123040.doi: 10.7527/S1000-6893.2019.23040

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Laminar transition influencing factors of nacelle based on double eN method

MENG Xiaoxuan1, BAI Junqiang2, ZHANG Meihong3, WANG Meili3, HE Xiaolong1, WANG Hui1   

  1. 1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
    2. Unmanned System Research Institute, Northwestern Polytechnical University, Xi'an 710072, China;
    3. Shanghai Aircraft Design and Research Institute, Commercial Aircraft Corporation of China, Ltd., Shanghai 201210, China
  • Received:2019-04-01 Revised:2019-04-25 Online:2019-12-03 Published:2019-06-14
  • Supported by:
    National Natural Science Foundation of China (11802245)

Abstract: The development of natural laminar flow nacelle is of great significance to enhance the economy and environmental friendliness of modern civil transport aircrafts. The study on the laminar-to-turbulent transition influencing factors of the nacelle can better guide the design of laminar flow nacelle. Based on the linear stability analysis method, the double eN-method coupled with the RANS equation solver is used to establish an instability prediction method that can simultaneously calculate the N-factors of the induced transition of T-S (Tollmien-Schlichting) wave and cross flow. The method is verified through the spheroid with detailed experimental data. Then the influence factors including flow Mach number, Reynolds number, turbulence, and angle of attack on the transition of the nacelle are examined. The results show that the obvious change of pressure gradient caused by Mach number and angle of attack or sideslip angle will lead to the change of transition position, whereas the Reynolds number and the turbulence intensity have relatively little influence on transition position under high Reynolds number condition, because the range of transition position movement is no more than 5% of the nacelle length. Therefore, in the design stage, it is better to maintain the positive pressure gradient on the upstream of the nacelle as large as possible.

Key words: natural laminar flow nacelle, double eN method, linear stability analysis, transition judgment, transition influencing factors

CLC Number: