Zhejiang Fuchunjiang Hydropower Equipment Co.

Hangzhou, China

Zhejiang Fuchunjiang Hydropower Equipment Co.

Hangzhou, China

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Wu H.,Xi'an University of Technology | Feng J.J.,Xi'an University of Technology | Wu G.K.,Xi'an University of Technology | Wu G.K.,Zhejiang Fuchunjiang Hydropower Equipment Co. | And 2 more authors.
IOP Conference Series: Earth and Environmental Science | Year: 2012

In this paper, the flow field considering the hub clearance flow in a Kaplan turbine has been investigated through using the commercial CFD code ANSYS CFX based on high-quality structured grids generated by ANSYS ICEM CFD. The turbulence is simulated by k-ω based shear stress transport (SST) turbulence model together with automatic near wall treatments. Four kinds of simulations have been conducted for the runner geometry without hub clearance, with only the hub front clearance, with only the rear hub clearance, and with both front and rear clearance. The analysis of the obtained results is focused on the flow structure of the hub clearance flow, the effect on the turbine performance including hydraulic efficiency and cavitation performance, which can improve the understanding on the flow field in a Kaplan turbine. © Published under licence by IOP Publishing Ltd.


Zhang Q.-F.,Beijing Jiaotong University | Yan J.-L.,Zhejiang Fuchunjiang Hydropower Equipment Co. | Wang M.,Zhejiang Fuchunjiang Hydropower Equipment Co. | Chen Z.-X.,Zhejiang Fuchunjiang Hydropower Equipment Co.
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2013

The flow of dual radial ventilation system without fan for a hydro-generator was simulated with parallel computing CFD code. The multiple implicit rotating frame (MRF) method and porous media model were used, averaged 3D Navier-Stokes (N-S) equations and RNG k-ε equations were solved. The flow characteristic of different parts was analyzed. In order to get accurate heat transfer coefficients of the wall for thermal stress analysis with finite element method, the heights of the fist meshes near the wall were controlled strictly and the values of y+ were controlled between 30 and 100. Because the flow flux to cool the end of stator bars is small, the style of cover of pole (static or rotating) and the leakage gaps between poles and stators will impact the cooling of stator bars. The rotating cover with leakage gaps is the best style for the cooling of stator bars. The flow from leakage gaps between poles and stators forms "air wall" with rotating velocity, which generates a recirculating zone between internal stator bars and induces the air from cooler into the zone, the heat transfer coefficient of internal stator bars is higher than the one of external stator bars. The heat transfer coefficient of internal stator bars is reduced after removing the leakage gaps. Due to rotational effects of the poles, the main ventilation loss is generated at the entrance of stator ventilation slots, the windward and leeward zones are formed around stator bars and recirculating zones are easy to be formed in leeward zones. The heat transfer coefficient in windward zones is higher than the one in leeward zones. The research is helpful for the optimization of the ventilation system design.


Zhang Q.,Beijing Jiaotong University | Cui H.,Beijing Jiaotong University | Yan J.,Zhejiang Fuchunjiang Hydropower Equipment Co. | Wang M.,Zhejiang Fuchunjiang Hydropower Equipment Co. | Chen Z.,Zhejiang Fuchunjiang Hydropower Equipment Co.
Advanced Materials Research | Year: 2012

Reynolds averaged Navier-Stokes (RANS) equations, energy equation and V2f turbulence model equations governing the flow field of the rotor frame, magnetic yoke and the pole, the stator were solved with finite volume method(FVM) based on unstructured mesh. The MRF(multiple implicit rotating frame) method was used to simulated the rotating motion of the rotor frame, magnetic yoke and the pole. The flow characteristic of different parts was analyzed. The influence of the gap size between insulating layer of bar core, the gap size between insulating layer of pole and coil to the temperature distributions on the solid parts was studied. The results show that the temperature on the windward of the pole is lower than the temperature on the leeward. With the gap size between the insulating layer of bar and core varying from 0.0mm to 0.3mm, the temperature of insulating layer of bar rise increases 9.2 degrees, So the gap size is important for the life of insulating layer. With the gap size between the insulating layer of pole and the coil varying from 0.25mm to 0.75mm, the temperature of coil increases 16.5 degrees. The results provide a reference for the rational design of the gap size.


Zhang Q.,Beijing Jiaotong University | Yan J.,Zhejiang Fuchunjiang Hydropower Equipment Co. | Wang M.,Zhejiang Fuchunjiang Hydropower Equipment Co. | Chen Z.,Zhejiang Fuchunjiang Hydropower Equipment Co.
Advanced Materials Research | Year: 2012

Averaged 3D N-S equations and RNG k-ε equations were solved with parallel computing CFD code on the flow field of dual radial ventilation system without fan for a hydro-generator. The MRF(multiple implicit rotating frame) method was used to simulated the rotating motion of the generator and porous media model were used to simulate the pressure loss of air cooler. Rational tactics were selected to generate calculation grids to compromise with calculation CPU time and result accuracy and the grids of different parts were generated with ICEM-CFD. The flow characteristic of different parts was analyzed and flow flux of different section was obtained. The research indicated that the flow from leakage gap between poles and stators formed "air wall", which generated a recirculation zone and made the bar cooling bad. The local pressure loss of stator entrance is dominant. There are leeward and windward areas for the air flowing with circumferential velocity component. Rational design of stator ducts entrance with some diversion effect, can reduce the pressure loss of the stator ventilation and improve the cooling of leeward area in stator ducts.


Jiang X.,Zhejiang University | Wang J.,Zhejiang University | Fang J.,Zhejiang Fuchunjiang Hydropower Equipment Co.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology | Year: 2011

The effects of elastic deformation of pad surface, rotational speed, axial load, and oil viscosity grade on tilting pad thrust bearing performance were analysed using the model of thermal elastohydrodynamic lubrication. The Reynolds equation, the viscosity-temperature and density-temperature characteristics of the lubricants, film thickness equation, energy equation, heat conduction equation, and elastic deformation equation were simultaneously solved with the finite-difference method. The results showed that the maximum pressure is reduced and the minimum film thickness is decreased, when pad deformation is taken into account. The rotational speed has significant effects on the film thickness and temperature, however, slight effects on hydrodynamic pressure. The heavier load leads to an increase in the maximum pressure and a decrease in the film thickness, and the temperature is slightly affected by the load. The oil film with higher viscosity grade has a higher load-carrying capacity, and consumes much more energy than those of low-viscosity fluid.


Wang H.,Zhejiang University | Zong R.,Zhejiang Fuchunjiang Hydropower Equipment Co. | Liu L.,Zhejiang University | Yang S.,Zhejiang University
2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014 | Year: 2015

Accurate and precise determination of 3D eddy current and temperature fields of a large hydro-generator has always been a formidable challenge to engineers and academicians. In this regard, the full three dimensional (3D) finite element models and methods are developed for numerical solutions of the coupled eddy current and temperature fields in the end region of a large hydro-generator. The equivalent medium parameters used in the computations are then comprehensively discussed. The methodology to determine the field and phase currents under different operating states is also presented. Moreover, an approach to effectively deal with the thin skin-depth is introduced. Numerical results on the coupled eddy current and temperature fields in the end region of a 100 MW hydro-generator in three different operating conditions confirm positively the feasibility of the present work. © 2014 IEEE.


Wang X.F.,Zhejiang Fuchunjiang Hydropower Equipment Co. | Li H.L.,Zhejiang Fuchunjiang Hydropower Equipment Co. | Zhu F.W.,Zhejiang Fuchunjiang Hydropower Equipment Co.
IOP Conference Series: Earth and Environmental Science | Year: 2012

Francis turbine, as a widely used hydro turbine, is especially suited for the hydropower station with high hydraulic head and higher hydraulic head. For such turbine generator units all around the world, the crack streaks usually come out after a long time use and the resulted accidents may cause huge losses. Hence, it is meaningful to refine the design assuring the stability and safety of the Francis turbine. In this paper, the stiffness and strength as well as the fatigue life of the Francis turbine are studied. Concerning on the turbine of one certain hydropower station, the flow field inside the turbine are first simulated and the pressure distribution around the blades are derived. Meanwhile, the stress distributions of the blades are also obtained. Based on these, the fatigue analyses are applied on the turbine. According to the results of fatigue analyses, some optimal designs on the turbine are verified. The results show that with the optimal designs, the hydraulic performances of the turbine do not change too much while the maximum stress on the turbine decrease and the fatigue life increase as well. © Published under licence by IOP Publishing Ltd.


Li H.,Zhejiang Fuchunjiang Hydro Power Equipment Co. | Wang M.,Zhejiang Fuchunjiang Hydro Power Equipment Co. | Li G.,Zhejiang Fuchunjiang Hydro Power Equipment Co.
Advances in Science and Technology of Water Resources | Year: 2014

In this paper, we apply the finite element method to build a model based on flow-solid coupling modal analysis theory in order to capture the vibration characteristics of operating a Francis turbines and the law of effect of components on natural frequencies of wheels. The overall results show that the natural frequencies of wheels with various vibration modes reduce at different levels under the influence of water. Specifically, the ratios of correspondingly frequencies in water of overall vibration modes such as turning, bending and lifting to those in air are gradually decreased with exception of the ratio of blades. Furthermore, it is difficult to avoid resonance phenomenon for wide corresponding frequency domain of blades vibration, and that natural frequencies of wheels will reduce when thickness of higher canopy reduced, and only natural frequencies of turning, bending and lifting of wheels as well as the waterside reinforcing wheels will increase when the lower canopy reduced. By combining the results of analysis and impact factors, we have proposed measures to improve state of wheels vibrating in water, including compensating air, trimming blades outlet, improving cone-shaped form of drain, and adding stabilizers.

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