Volume 28 Issue 8
Aug.  2013
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LI Teng, LIU Yong-hong, XIE Yi, SHAO Wan-ren, WU Fei. Effect of ratio of height to width of lobe on performance of forced mixing exhaust system[J]. Journal of Aerospace Power, 2013, 28(8): 1736-1743.
Citation: LI Teng, LIU Yong-hong, XIE Yi, SHAO Wan-ren, WU Fei. Effect of ratio of height to width of lobe on performance of forced mixing exhaust system[J]. Journal of Aerospace Power, 2013, 28(8): 1736-1743.

Effect of ratio of height to width of lobe on performance of forced mixing exhaust system

  • Received Date: 2012-07-27
  • Publish Date: 2013-08-28
  • The effects of different ratios of height to width of lobe mixers on the flow field, thermal mixing efficiency, total-pressure recovery coefficient and thrust coefficient were studied when the areas of inner duct and outlet duct kept constant in turbofan aero-engine forced mixing exhaust system. Geometric models with various ratios of height to width of lobed mixer in turbofan aero-engine forced mixing exhaust system were built, and the numerical simulation methods based on Navier-Stokes equations were conducted. The results indicate that at the exit section, if the areas of inner duct and outlet duct keep constant, in a range of ratios of height to width of 2 to 4.5, the thermal efficiency of lobed mixer has the trend of increasing, decreasing and increasing again, and at last the inflection points of efficiency function curve are at 3 and 3.21. In addition, with the increase of ratio of height to width, the total-pressure recovery coefficient and thrust coefficient also decrease.

     

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