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Particle image velocimetry measurement of velocity distribution at inlet duct of waterjet self-propelled ship model 被引量:1
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作者 龚杰 郭春雨 +1 位作者 吴铁成 赵大刚 《Journal of Hydrodynamics》 SCIE EI CSCD 2017年第5期879-893,共15页
A vehicle-mounted three-dimensional underwater particle image velocimetry(PIV) device is used in a towing tank to measure the velocity distribution of the inlet duct of a waterjet ship model in a self-propulsion tes... A vehicle-mounted three-dimensional underwater particle image velocimetry(PIV) device is used in a towing tank to measure the velocity distribution of the inlet duct of a waterjet ship model in a self-propulsion test. The following points are shown through a comparison of the influences of the stationary and free states of the ship model on the measured results:(1) during the test, the ship attitude will change, specifically, the ship model will heave and trim,(2) the degree of freedom disturbs the processing of the pixel images enough to distort the subsequent image processing,(3) the stationary state of the ship model is the optimal mode for measuring the velocity distribution using the PIV device, and(4) if the changes must be considered, the man-made heaving and trimming may be pre-applied, and be made a corrected stationary mode. In addition, the momentum effect coefficient and the energy effect coefficient are calculated in a non-uniform inflowing state, and the related factors affecting the two coefficients are analyzed. The test results show that the pumping action of the waterjet creates a transverse vector in the cross-sectional speed, which increases the non-uniformity of the inflow. These results could help to establish the design requirements for a waterjet-propelled ship type. 展开更多
关键词 Particle image velocimetry(PIV) velocity distribution profile degree of freedom transverse vector
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Comparison of a Reaction Front Model and a Finite Difference Model for the Simulation of Solid Absorption Process
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作者 Zikang Wu Arne Jakobsen +1 位作者 Xiugan Yuan PWors e-Schmid 《Journal of Thermal Science》 SCIE EI CAS CSCD 1994年第2期136-141,共6页
The purpose of this paper is to investigate the validity of a lumped model, i.e. a reaction front model,for the simulation of solid absorption process. A distributed model is developed for solid absorption process, an... The purpose of this paper is to investigate the validity of a lumped model, i.e. a reaction front model,for the simulation of solid absorption process. A distributed model is developed for solid absorption process, and a dimensionless RF number is suggested to predict the qualitative shape of reaction degree profile. The simulation results from the reaction front model are compared with those from the distributed model solved by a finite difference scheme, and it is shown that they are in good agreement in almost all casest no matter whether there is reaction front or not. 展开更多
关键词 solid absorption SIMULATION reaction front RF number reaction degree profile.
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