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Ren P.,National Key Laboratory of Combustion | He G.-R.,National Key Laboratory of Combustion
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2014

In order to study the adaptability of large-scale solid rocket motor to the special vertical storage environment, FEM analysis and experimental study were carried out. Based on the analysis of storage environment, considering the influence of curing and inner pressure on the vertical storage grain, calculation and analysis under combined loading were carried out. Calculation results show that the gaps of fore and aft stress release boot become bigger in vertical storage state than that in the initial state. The gap of the fore stress release boot increase more than that of the aft one. The biggest axial displacement occurs on the opening position of the stress release boot. The biggest radial displacement of the grain occurs on the perforation. After filling gas in the motor, the deformation of the grain, the equivalent stress/strain of the fore/aft grain interface on the root of the stress release boot and the equivalent stress/strain of the perforation grain increase with the applied inner pressure. However, the stress state of the fore/aft grain interface on the root of the stress release boot and the perforation grain transfer from three-orientation/two-orientation tensile to two-orientation compression, so appropriate inner pressure is advantageous to the long-term vertical storage of the motor. Finally, the vertical storage experiment was carried out and the deformation of the grain was measured. Comparison results show that the measured values agree well with the calculation values. ©, 2014, Journal of Solid Rocket Technology. All right reserved.


Chen X.-L.,National Key Laboratory of Combustion | He G.-Q.,National Key Laboratory of Combustion | Liu P.-J.,National Key Laboratory of Combustion | Qin F.,National Key Laboratory of Combustion | Li Q.,National Key Laboratory of Combustion
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2010

Pressure oscillation in combustion chamber could induce the unstable operation of motors or missiles. Nozzle, as a main part of motor, possesses great influence on pressure oscillation. The linear relationship between the pressure oscillation amplitude and the volume of cavity induced by submerged nozzle is validated in this paper using large eddy simulations. The effect of cavity volume on pressure oscillation amplitude is found to be larger than that of the cavity inlet geometry. The vortex-acoustic interaction is examined. The impingement of vortex on submerged nozzle serves as one of most important parts in vortex-acoustic interaction. The conclusion can be used as a reference for design of submerged nozzle of large solid rocket motor.

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