No.719 Institute of the China Shipbuilding Industry Corporation

Wuhan, China

No.719 Institute of the China Shipbuilding Industry Corporation

Wuhan, China
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Li S.,Lanzhou University of Technology | Li Z.,Lanzhou University of Technology | Zhou A.,No.719 Institute of the China Shipbuilding Industry Corporation | Wang H.,Lanzhou University of Technology
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | Year: 2017

Aiming at the problem that valve profile line design at home and abroad usually used experimental method and profile line was verified after model tests, flow area relationships of control valve about nine groups at opening from 20% to 100% were derived based on throttle principle. Genetic algorithm was used to establish throttle plate opening profile line, computational fluid dynamics (CFD) was used to simulate flow rate of nine groups at opening from 20% to 100%, and the results were verified by experiments. The results showed that flow characteristic curve after optimization meets the requirements, and the errors of simulation and experiments is within 10%, accord with the requirements of engineering practice. Optimization results verify the effectiveness of the optimization design method and applicability of CFD simulation technology, providing technical reference for optimization of control valve core opening profile line. © 2017, Editorial Board of Journal of Huazhong University of Science and Technology. All right reserved.


Yin J.,Shanghai JiaoTong University | You Y.,Shanghai JiaoTong University | Hu T.,Shanghai JiaoTong University | Zhao L.,No.719 Institute of the China Shipbuilding Industry Corporation | And 3 more authors.
Lixue Xuebao/Chinese Journal of Theoretical and Applied Mechanics | Year: 2013

The distribution of the electromagnetic force around a cylinder covered by electromagnetic actuators is obtained firstly by solving Maxwell equation system, and then such a Lorentz force is added to the momentum equation of flow governing equation system. The numerical simulation is carried out to simulate and analyze the flow structures around a circular cylinder and its lift/drag characteristics in a weakly conductive fluid under various combinations for electromagnetic interaction parameters and electromagnetic actuator widths when the Reynolds number Re=200. The results show that for the case of small electromagnetic actuator width, the separation point of the flow around a cricular cylinder is easier close to the back stagnation point, and the electromagnetic force has small influence on the total drag, but it has obvious influence on the pressure and friction. For the case of large electromagnetic actuator width, the cylinder wake is easier to become jet flow, and the total drag decreases as the electromagnetic interaction parameter and the electromagnetic actuator width increase. Moreover, for the case where the electromagnetic force is insu_cient to completely inhibit periodic vortex shedding, the lift amplitude decreases as the electromagnetic interaction parameter increases, but it first has an obvious reduction and then a slight increase as the electromagnetic actuator width increases, and the lift pulsation frequency increases as electromagnetic interaction parameter and the electromagnetic actuator width increase. The results imply that the electromagnetic force can effectively improve the flow structure around a cricular cylinder to achieve the purpose of reducing the drag and inhibiting the lift fluctuation, therefore the flow structures can be improved effectively by the electromagnetic force.

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