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A three-dimensional Euler-Lagrange model was used to study the distribution of particles in scrubbing-cooling chamber of coal-water-slurry (CWS) entrained-flow gasifier. Comparisons of computational results with experimental data are made. The effects of operating conditions and size grading on the particle number density distribution in chamber is revealed through simulation. The results indicate...
A two-fluid model was adopted to simulate the three-dimensional gas-liquid flow in an aeration tank. The different operation parameters of aeration tank were simulated with the model, and the gas-liquid flow behavior in aeration tank was analyzed. The simulation results agree qualitatively with the operating conditions in literature and actual plant. Application of the model was demonstrated by analyzing...
Undulation fishes, whose propulsion is mainly achieved by undulating ribbon fins, are good at maneuvering or stabilizing at low speeds. This paper suggests and proposes a two-dimensional approximate computational model before presenting an initial analysis on undulation propulsion scheme. It is believed that this mode has a better potential for exploitation in artificial underwater systems. Hydrodynamics...
At present, the aerodynamic characteristic of the pantograph has been attached more importance to with the improvement of the high speed train. The excellent aerodynamic characteristic of the pantograph is a significant factor ensuring the current collecting stability between the pantograph and catenary and increasing the using life. The studying methods on it include theoretical computing, numerical...
The pintle controlled thrust regulating mechanism is an effective means to realize thrust real-time regulation of solid-rocket engine. Factors of thrust regulating range and speed, thrust loss, reacting force on pintle section should be considered in pintle design. Numerical simulation on inner flow field of nozzle for different radius pintle, different head coning of pointed cone pintle and different...
In this paper, coordinated motion control of underwater vehicle-manipulator system (UVMS) is addressed. In order for UVMS to carry out manipulation tasks alone, motion planning with consideration of redundancy and tracking control under disturbances are required. We propose redundancy resolution with optimization of restoring moments as motion planning and inverse optimal nonlinear Hinfin control...
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