Flow characteristics in a rotor-stator cavity with cooling air inlet at low radius |
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Authors: | CAI Xu LUO Xiang ZHAO Xi XU Guo-qiang and CAI Jun |
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Institution: | 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 |
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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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Keywords: | cooling system rotor-stator system flow characteristics pressure distribution resistance coefficient |
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