Volume 30 Issue 4
Apr.  2015
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CAI Xu, LUO Xiang, ZHAO Xi, XU Guo-qiang, CAI Jun. Flow characteristics in a rotor-stator cavity with cooling air inlet at low radius[J]. Journal of Aerospace Power, 2015, 30(4): 775-783. doi: 10.13224/j.cnki.jasp.2015.04.002
Citation: CAI Xu, LUO Xiang, ZHAO Xi, XU Guo-qiang, CAI Jun. Flow characteristics in a rotor-stator cavity with cooling air inlet at low radius[J]. Journal of Aerospace Power, 2015, 30(4): 775-783. doi: 10.13224/j.cnki.jasp.2015.04.002
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Flow characteristics in a rotor-stator cavity with cooling air inlet at low radius

doi: 10.13224/j.cnki.jasp.2015.04.002

  • 1. National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;

  • 2. Department of Information Network, Dalian Airforce Communicaiton Non-Commissioned Office Academy, Dalian Liaoning 116600, China;

  • 3. Guizhou Aero-Engine Research Institute, Aviation Industry Corporation of China, Guiyang 550081, China

  • Received Date: 2013-11-11
  • Publish Date: 2015-04-28
    Abstract
  • Experiments were conducted on a typical rotor-stator system where air entered through an annular slot at low radius and flowed out of the cavity axially through a rim seal between the rotor and the stator. For the seal in this rotor-stator system, the stationary shroud overlapped the rotating one. Pressure distributions at the stator surface and flow resistance coefficients of the rotor-stator cavity with a maximum gap of 67mm were measured under different dimensionless mass flow rates from 1.32×104 to 4.87×104 with a large range of rotational Reynolds numbers from 0.418×106 to 2.484×106. The results show that pressure on the stator surface decreases with the increase of rotational Reynolds number when the dimensionless mass flow rate is below 1.3×104; when the dimensionless mass flow rate is above 3.034×104, the trend reverses. This is the so-called "pressure inversion effect". However, dimensionless pressure does not show the same changes when rotational dynamic pressure is chosen as the denominator. The resistance coefficient of the rotor-stator cavity is determined by the dimensionless mass flow rate and rotational Reynolds number; for practical application, the resistance coefficient can also be estimated by the turbulent flow parameter in the range of turbulent parameter from 0.1 to 1.6.

     

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