Preliminary experiment on spontaneous ignition performances of cavity-based strut flameholder |
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Authors: | CHENG Cheng WANG Yibai LIU Yu LIN Qingguo |
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Institution: | 1.Research and Development Center,Shanghai Institute of Space Propulsion,Shanghai 201112,China2.Shanghai Engineering Research Center of Space Engine,Shanghai 2011123.School of Astronautics,Beijing University of Aeronautics and Astronautics,Beijing 100191 |
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Abstract: | The thermal-structural response and low cycle fatigue life of a three-dimensional(3D)channel wall nozzle with regenerative cooling were numerically investigated by coupling the finite volume fluid-thermal method,nonlinear finite element thermal-structural analysis and local strain methods.The nozzle had a high area ratio(nozzle exit area divided by throat area)under cyclic working loads.Parametric studies were carried out to evaluate the effects of channel structural parameters such as channel width,channel height,liner thickness and rib width.Results showed that the integrated effects of three-dimensional channel structure and load distribution caused serious strain,which mainly occurred at the intersectant regions of liner wall on the gas side and the symmetric planes of channel and rib.The cooling effect and channel structural strength were significantly improved as the channel width and height decreased,leading to substantial extension of the nozzle service life.On the other hand,the successive decrease in liner thickness and rib width apparently increased the strain amplitude and residual strain of channel wall nozzle during cyclic work,significantly shortening the service life.The present work is of value for design of the channel wall nozzle to prolong its cyclic service life. |
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Keywords: | spontaneous combustion ignition strut flameholder bluff body cavity |
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