Harbin Electrical Power Equipment Co
Harbin Electrical Power Equipment Co
Wang X.,Tsinghua University |
Min Q.,Tsinghua University |
Zhang Z.,Tsinghua University |
Duan Y.,Tsinghua University |
And 2 more authors.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2017
Wilhelmy plate method measures and calculates dynamic contact angle based on force balance equation of the test plate (or fiber). The equation doesn't consider the resistance force which may result in a measurement error at high testing speed or for plate with non-negligible thickness. In this work, the influences of two ignored resistance forces, i.e. head resistance force and viscous friction, on dynamic contact angle were investigated both theoretically and experimentally. An auxiliary optical facility was designed and added to the tensiometer in order to get dynamic contact angle by direct optical method to verify the validity of the force balance method's result. A series of experiments for silicone oils with various viscosities on quartz plates with different thicknesses were done and proved that the two above forces cannot be ignored when Ca got larger or the plate got thicker. A new force balance equation was established, in which the fitting results of both head resistance force coefficient and viscous friction coefficient were nearly constant for all the testing twelve systems. By using new equation, the accuracy of dynamic contact angle testing results were obviously improved especially at high Ca. © 2017 Elsevier B.V.
Yan J.,Dalian University of Technology |
Duan Z.,Dalian University of Technology |
Duan Z.,University of Aalborg |
Duan Z.,Harbin Electrical Power Equipment Company Ltd |
And 3 more authors.
Structural and Multidisciplinary Optimization | Year: 2017
This paper presents a gradient based concurrent multi-scale design optimization method for composite frames considering specific manufacturing constraints raised from the aerospace industrial requirements. Geometrical parameters of the frame components at the macro-structural scale and the discrete fiber winding angles at the micro-material scale are introduced as the independent design variables at the two geometrical scales. The DMO (Discrete Material Optimization) approach is utilized to couple the two geometrical scales and realize the simultaneous optimization of macroscopic topology and microscopic material selection. Six kinds of manufacturing constraints are explicitly included in the optimization model as series of linear inequalities or equalities. The capabilities of the proposed optimization model are demonstrated with the example of compliance minimization, subject to constraint on the composite volume. The linear constraints and optimization problems are solved by Sequential Linear Programming (SLP) optimization algorithm with move limit strategy. Numerical results show the potential of weight saving and structural robustness design with the proposed concurrent optimization model. The multi-scale optimization model, considering specific manufacturing constraints, provides new choices for the design of the composite frame structure in aerospace and other industries. © 2017 Springer-Verlag GmbH Germany
Feng X.,Harbin Electrical Power Equipment Co. |
Wu D.,Zhejiang University |
Yang L.,Harbin Electrical Power Equipment Co. |
Jia Y.,Harbin Electrical Power Equipment Co.
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2016
As high-end equipment in pump industry, CNP1000 shaft sealed reactor coolant pump (RCP) in the primary loop system of pressurized water reactor (PWR) in a nuclear power plant is the only equipment which cannot be manufactured domestically. Therefore, the independent design, ma-nufacturing and test of this kind of pump are important and difficult tasks in promoting the nationalization of nuclear technology in China. The domestic technological situation and structural characteristics of 1000 MW shaft sealed RCP are introduced, and the design principle and technical implementation requirement are elaborated in terms of pressure retaining boundary, hydraulic components, pump rotor system, heat insulation subassembly, shaft seal, standstill seal, lower guide bearings, thrust bearing, integrated oil pump, oil seal, auxiliary system and key equipment in detail. Through an analysis on export restriction and application prospect of various types of RCP, it is shown that shaft sealed RCP has more strength in export and will occupy a dominant position in the nuclear equipment market for a long time. Presently, several key technologies, such as shaft seal, hydraulic components, and full-load test have been nationalized in a few domestic factories, but the theoretical principle of RCP is still not well established and needs to be explored further. Hence, as an important mission, the nationalization of RCP still requires a long time to be tackled. © 2016, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved.
Jia Y.,Harbin Institute of Technology |
Jia Y.,Harbin Electrical Power Equipment Co. |
Wei X.,State Key Laboratory of Hydropower Equipment
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2015
In order to design and validate the auxiliary impeller required by the cycle power of the oil-lubricated external circulation cooling system on the reactor coolant pump's bi-directional thrust bea-ring, the CFD method is applied to present a numerical analysis for the pressure feature and flow rate within the oil impeller. The objective is to demonstrate the vector distribution of the relative velocity on the center surface of the flow path, and to verify the possibility of creating any flush angle from the inlet flow of the vane, the pros and cons of the vane shape design and how well it functionally matches the vane. The numerical analysis intuitively reflects the flow parameters and patterns generated by the designed shape of the vane, indicates the fact that the velocity at the vane's inlet mainly affects the tangent angle; thus, effectively lowers the damaging impact on any system devices located adjacent to the rear outlet of the vane. Through simulation of the oil-lubricating circulation, numerical analysis are comparatively analyzed with the testing results, for all 5 complete working processes, deviations are uniformly less than 5% and precisely satisfied lubricating oil's flow, head, zero-impact on flows and other operating requirements. This paper concludes the practical application of a simplified numerical analysis and reasoning could replace the repetitive testing employed in the traditional design process for axial auxiliary impellers. It has been successfully applied in the design of reactor coolant pump. ©, 2015, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved.
Lu Y.-P.,Harbin University of Science and Technology |
Liu C.-Y.,Harbin University of Science and Technology |
Li M.-Q.,Harbin Electrical Power Equipment Co. |
Li J.-T.,Harbin Electrical Power Equipment Co.
Dianji yu Kongzhi Xuebao/Electric Machines and Control | Year: 2012
In order to obtain the flow characteristics of cooling air in the stator, rotor and the magnetic pole gap of some salient motor, the 1/8 structure of whole motor was established, including three-dimensional physical model of the ventilation system of stator and rotor. The three-dimensional turbulent governing equations of time-averaged flow field were calculated numerically by the Fluent software for (computational fluid dynamics, CFD) calculation based on some corresponding boundary conditions. Distribution characteristics of air velocity and static pressure in salient motor ventilation system were received and fluid flow characteristics of rotor pole gap and stator radial ventilation ducts were mainly analyzed. The result shows that air flow rate inside the ventilation ducts in front of the stator is small and the air flow which accounts for 26% of the total air flow rate inside the pressure finger gap is large, which is beneficial to reduce stator peak temperature, and flow distribution of each part in the motor such as stator and rotor gap is reasonable.
Liang Y.,Harbin University of Science and Technology |
Bian X.,Harbin University of Science and Technology |
Yu H.,Harbin University of Science and Technology |
Li C.,Harbin Electrical Power Equipment Co.
IEEE Transactions on Industrial Electronics | Year: 2015
Large double-canned induction motor has high power density and usually works in a closed environment. Compared with a common induction motor, there are many contacted metallic parts in the stator end region of a large double-canned induction motor, in which eddy current will exist not only in end metallic parts themselves but also between contacted metallic parts. Evaluation of eddy-current losses in stator end metallic parts and reasonable end structure design is the premise of ensuring the safe and stable operation of a large double-canned induction motor. A 5-MW-scale double-canned induction motor is taken as an example in this paper, and the 3-D eddy-current field finite-element calculation model of its stator end is established and solved. Then, the eddy current in stator end metallic parts and between different contacted stator end metallic parts is analyzed in detail. On this basis, the eddy-current losses' decrease method through cutting off the eddy-current path between contacted stator end metallic parts is proposed and validated by experimental results of temperature. © 2015 IEEE.
Sha Y.,Zhejiang University of Science and Technology |
Liu X.,Harbin Electrical Power Equipment Company Ltd
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014
In order to study the characteristics of the flow field and gas-liquid two-phase flow hydrotransport in vortex pumps, the performance test and the measurement of flow field in volute at optimal operating condition with five-hole probes were conducted on a self-built vortex pump (32WB8-12). Based on these experiments, the qv-H, qv-P, qv-η, qv-NPSHc performance curves and the absolute velocity v, circumferential velocity vu, radial velocity vr, axial velocity vz, and the flow static pressure ps, on the 5 measuring points were obtained. The obtained parabolic qv-NPSH performance curve shows the opposite tendency compared to the centrifugal pump. The mechanical properties of the four kinds of forces in gas-liquid two-phase flow were analyzed with the Navier-Stokes Equation, and the results indicated the constraint relationship between performance and mechanical factors. Furthermore, the principle of gas-liquid flow hydrotransport and the difference between cavitating current and gas-liquid flow were also presented. The interior flow field in the pump under the optimal condition has been numerically simulated by FLUENT software based on the renormalization group k-ε turbulence model (RNG k-ε model) through which the pressure and velocity as well as gasvolume distribution of three cross sections in the vortex pump were obtained. The experimental results also showed that axial vortex was the dominant flow in the pump inlet, and the airflow gathered in the volute inlet with low pressure. The difference of molecule size, shape, and elastic modulus between airflow and liquid leads to the variations of the inertia, friction, and buoyancy forces in flow field, which explains the relationship between performance and parameters of the internal flow and gas-liquid suction as well as the head formation principle of vortex pump. The numerical results are in good agreement with flow field measurement data. The results show that the internal flow in the vortex pump mainly consists of through flow. The flow in the impeller region is of forced vortex characters, and the flow in volute is similar to the combined vortex with backflow, which is a non-axisymmetric unsteady flow with quite high turbulence intensity. All these should be main reasons for the relatively low efficiency of the vortex pump. The distortional principle of velocity field and the channel streamline with two-phase flow inside the vortex pump have been investigated in this article. This research provides a model of gas-liquid two-phase flow and cavitating current in vortex pump.
Zheng R.G.,Shenyang University |
Zhang X.X.,Harbin Electrical Power Equipment Co.
Applied Mechanics and Materials | Year: 2013
Sliding wear behavior of the (NbSe2+SiC)/Cu composite was studied on a pin-on-disc wear tester under various electrical currents and applied loads. The worn surfaces were characterized using scanning electron microscopy and energy dispersive spectroscopy to probe the wear mechanisms. Experiment results show that the friction coefficient and wear rate of (NbSe2+SiC)/Cu composite increased with increasing of the normal load. Adhesive wear, abrasive wear and fatigue wear were the main wear mechanism during the sliding process. © (2013) Trans Tech Publications, Switzerland.
Liang Y.-P.,Harbin University of Science and Technology |
Hu Y.-L.,Harbin University of Science and Technology |
Liu X.,Harbin Electrical Power Equipment Co. |
Li C.-X.,Harbin Electrical Power Equipment Co.
IEEE Transactions on Industrial Electronics | Year: 2014
The canned induction motors are widely used in pharmaceutical, chemical, and nuclear fields. It is necessary to calculate the losses, particularly the can losses, accurately. Combining steady-state ac magnetic 2-D finite-element solutions with the can harmonic loss formulas derived in this paper, the can losses under rated voltage in various operating conditions are obtained. Then, the calculation results under various voltages in no-load condition are compared with the experiment data, which provides the basis for the further performance analysis and motor design. © 1982-2012 IEEE.
Sha Y.,Zhejiang University of Science and Technology |
Liu X.,Harbin Electrical Power Equipment Company Ltd
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013
In order to study the solid-liquid two-phase flow hydrotransport characteristics of vortex pump, the energy consumption of pump caused by internal resistance is divided into two parts: the mechanical losses and hydraulic losses, also the calculation of mechanical efficiency ηm and hydraulic efficiency ηf is elaborated. This paper investigates the 32WB8-12 vortex pump's parameter of hydraulic design structure. The crops solid-liquid two-phase flow hydrotransport experiment plan is established, meanwhile the performance experiments of clean water, rapeseed, wheat and soya hydrotransport are conducted on a self-built vortex pump, after taking above experiments that the qv-H, qv-P, qv-η, qv-NPSHc curves are obtained. The experimental results indicates the pump's hydrotransport efficiency of spherical rapeseed is higher than clean water's and the others' two-phase flow. The pump anti-cavitations are reduced with the solid-liquid two-phase flow hydrotransport. The head and hydrotransport efficiency of pump ordinarily decrease with increased particle size under the condition of constant particle concentration. Moreover, the hydraulic efficiency of transporting regular sphere shape particles such as rapeseed is higher than the clean water's, wheat's and soya's. The characteristics are considered based on the slip flow with the principle of relativity that sliding liner and rotary motion between particles and fluid flow. Associated with particle's size and shape, the particles suffered inertial force, friction force and buoyant force have significance on fluid field, all above information also proved that internal two-phase flow of vortex pump meet the principle of distortion velocity. From the experimental data analyses, some explanations are given for the link and changing trends between the external characteristics and internal flow nature. This research can provide a reference for building the model of fluid solid two-phase flow in vortex pump.