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Tian W.-P.,Northwestern Polytechnical University | Tian W.-P.,The Fourth Academy of CSAC | Xu T.-W.,Northwestern Polytechnical University | Wang J.-R.,The 41st Institute of the Fourth Academy of CSAC
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2015

Substantive methods studying on insulation ablation in SRM under overload conditions made by scholars at home and abroad were summarized and analyzed. The paper focuses on the research progress in combustion chamber particle size parameter determination method, numerical simulation method on over load flow field ground and the simulation overload experiment. Two approaches to confirming parameters of particle distribution were proposed. One is particle collection and analysis based on flight motor, and the other is inverse analysis by numerical simulation based on flight motor blooey position, by which the particle size distribution parameters were given. Then rocket sled test is brought forward to dive into the insulation ablation. Moreover, based on numerical simulation results of a tactical SRM, the insulation ablation under two typical conditions which are high overload with short time and low medium overload with long time were discused. Eventually, some points needing attention in design of thermal protection were given. ©, 2015, Journal of Solid Rocket Technology. All right reserved. Source


Li Q.,Northwestern Polytechnical University | Gan X.-S.,The 41st Institute of the Fourth Academy of CSAC | Liu P.-J.,Northwestern Polytechnical University | Li J.,Northwestern Polytechnical University | He G.-Q.,Northwestern Polytechnical University
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2010

In consideration of the collisions between particles and impingement of particles on wall, a mathematical model for calculation of slag accumulation for submerged nozzle in SRM was established and simulation was carried for a large scale motor. The results show that the model presented is reliable and accurate; the impingement and adherence of large particles, resulting from particle collisions, on walls is the main contributor to slag accumulation; and the local structure of grain near the inlet of submerged nozzle has an effect on slag accumulation process. Source


Xu T.-W.,Northwestern Polytechnical University | Tian W.-P.,The Fourth Academy of CSAC | Wang J.-R.,The 41st Institute of the Fourth Academy of CSAC | Li Q.,Northwestern Polytechnical University
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2014

Aiming at solid rocket motor overload ground simulation test, the acceleration theoretical analysis for condensate phase particle was carried out. The results show that the particles are mainly affected by the Coriolis acceleration and gas drag role, but the role of the centrifugal acceleration is not dominant. Finally, 3D two-phase flow calculations as well as the ground simulation overload test under three groups overload conditions were carried out. Numerical calculation results reveal that particle deposition zone maintain between 60°~80° along the first quadrant to the four quadrant direction; the rotation test results reflect that serious erosion site and ablation site maintain between 70°~90° along the first quadrant to the four quadrant direction. Two results coincide well to a certain extent, which verify that the theoretical analysis is reasonable adn correct. Source


Wang J.-R.,Northwestern Polytechnical University | He G.-Q.,Northwestern Polytechnical University | Xu T.-W.,The 41st Institute of the Fourth Academy of CSAC | Tian W.-P.,The 41st Institute of the Fourth Academy of CSAC
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2012

Aiming at revealing the relation between the internal joint width and the pressure oscillation for SSRM (Segmented Solid Rocket Motor), a two-dimensional axisymmetric model was built. LES (Large Eddy Simulation) was carried out for six different expansion ratio. Finally, pressure evolution and its FFT (Fast Fourier Transform) results were analyzed. Results indicate that the amplitude of pressure oscillation displays a decrease tendency as the expansion ratio increasing, but the frequency of pressure oscillation is unchanged. The result has gained validation through SSRM static test. Source

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