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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2018, Vol. 39 ›› Issue (8): 121863-121863.doi: 10.7527/S1000-6893.2018.21863

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Scheme selection for heating fatigue test-bed design of canopy based on CFD

WANG Xin, WANG Gang, ZHANG Xuefei, HE Qianqiang   

  1. Shenyang Aircraft Design & Research Institute, Shenyang 110035, China
  • Received:2017-11-13 Revised:2018-04-23 Online:2018-08-15 Published:2018-04-23

Abstract: Uniform distribution of temperature on the outer surface of a large area canopy in heating fatigue tests, in particular for long time and high temperature conversion frequency tests is the key to reliability of the tests, and is also a technical problem for the design of fatigue test-beds. In this paper, we study how parameters of the design of the canopy heating fatigue test-bed influence the uniformity of the temperature field, as defined by the coupled heading temperature difference and spanwise temperature difference. A three-dimensional unsteady convection-conduction model is developed to study the scheme for selection of the design parameters of the test section and the front transition section of the annular channel through Computational Fluid Dynamics (CFD) based simulations. Effects of the factors, such as variation period of inlet temperature, characteristic dimension of the test section, inlet flow rate, and characteristic angle of the front transition section, on temperature field uniformity are discussed. It is found that change of the control period of inlet temperature has little effect on temperature distribution over the outer surface of the canopy, and adjustment of the characteristic dimension of the test section can significantly change the temperature difference in the heading and spanwise directions. In addition, increasing the inlet flow rate can effectively improve the uniformity of temperature field on the outer surface of the canopy. By changing the characteristic angle of the front transition section, the temperature difference caused by the windshield temperature can be significantly improved. The results presented in this study can provide theoretical support for scheme selection for heating fatigue test-bed design of the canopy.

Key words: Computational Fluid Dynamics (CFD), canopy, heating fatigue test, uniformity of temperature field, unsteady convection-conduction, scheme selection

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