Wan S.,North China Electrical Power University |
Dou L.,North China Electrical Power University |
Zhan C.,Hangzhou Steam Turbine Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2017
The velocity change and tangential force acted on the rotor of an axial flow compressor were analyzed in consideration of the rotating stall condition and the characteristics of tangential force. The principle and process of rotating stall were expounded theoretically. Then the tangential force acted on the rotor of axial flow compressor was deduced, when the compressor works in both normal and stall conditions. The characteristics of tangential force in rotating stall condition were obtained, and a comparison between the simulated and theoretical results was carried out. The feasibility of the theoretical analysis was verified by experimental simulations and the characteristics of tangential force and velocity change in rotating stall condition were obtained. The work mentioned above provides a useful reference to the subsequent vibration analysis and optimum structure design of compressor rotors. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.
Chen T.,Hangzhou Steam Turbine Co. |
Zhu Y.,Hangzhou Steam Turbine Co. |
Ding X.,Hangzhou Steam Turbine Co.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2017
An optimization was conducted to the design of a plate stiffener located in the lower area of steam turbine exhaust hood using Latin hypercube experiment design, cubic response surface model and Hooke-Jeeves direct search technique. Based on numerical investigation of a large number of samples, the influence of different geometric parameters of the stiffener was studied on the aerodynamic performance of the exhaust hood, which was examined under variable conditions after optimization. Results show that both the distance between the stiffener and the meridian plane X as well as the dip angle of the stiffener θ have large influence on the aerodynamic performance of the exhaust hood, while the distance between the stiffener bottom and the hood outlet Y as well as the length of the stiffener L have little influence. The static pressure recovery coefficient can be improved effectively by arranging the stiffener appropriately, when the outlet non-uniformity would be reduced; however, this may lead to a certain loss of the total pressure. © 2017, Editorial Department of Chinese Society of Power Engineering. All right reserved.
Zhang C.,Zhejiang University of Technology |
Liu L.,Hangzhou Steam Turbine Co. |
Li X.,Zhejiang University of Technology
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2015
Structural simulations were conducted for the high backpressure reactionary industrial steam turbine using finite element method, multi-physics thermosetting coupling method and nonlinear contact theory. The steady state temperature field and comprehensive stress field under criteria and ultra-criteria condition were calculated, and a comparison was made for the strength of exhaust hood and the steam tightness of horizontal flange under above two conditions. Corresponding suggestions were subsequently proposed for the structure improvement to overcome the deficiency occurring under ultra-criteria condition, such as increasing the wall thickness, changing the bolt material, size and location, and resetting the pre-tightening loads, etc. Results show that the simulation data under criteria condition agree well with that of the design criteria, which proves the calculation method to be accurate. Compared with the criteria condition, the strength safety margin of exhaust hood under ultra-criteria condition drops from 3.16to 2.42, and the contact gap of rear shaft seal rises from 0.047mm to 0.082mm, both of which have exceeded the design criteria. The newly improved structure can meet all the requirements on performance indicators in actual engineering projects. ©, 2015, Shanghai Power Equipment Research Institute. All right reserved.
Liu X.,Xi'an Jiaotong University |
Wang X.,Xi'an Jiaotong University |
Xu Y.,Xi'an Jiaotong University |
Xu Y.,Hangzhou Steam Turbine Co.
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2012
Numerical simulation on the liquid sloshing in a cylindrical tank with partially filled liquid by periodic boundary excitation was performed to determine the influences of external excitation frequency and swing radius upon the force exerted on the container wall, and upon the liquid sloshing amplitude and frequency. The numerical results show that after a period of adjustment, the sloshing amplitude will be stable and the sloshing frequency approaches the external excitation frequency. When the external excitation frequency approaches the liquid natural frequency, the liquid sloshing amplitude will increase and the impact force exerted on container wall will be stronger. In addition, the liquid sloshing frequency is irrelevant to the swing radius while the liquid sloshing amplitude decreases with an increase in swing radius.
Geng W.,Xi'an Jiaotong University |
Dan H.,Hangzhou Steam Turbine Co. |
Chen C.,Xi'an Jiaotong University |
Li J.,Xi'an Jiaotong University
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2016
The design of an impeller with axial admission of air flows, i.e., the impeller with blade leading edge located at the impeller eye, was presented and discussed. First, the cubic Bezier curve was applied to design the meridional flow channel. Then, the distribution of the angular momentum on surfaces of the shroud and hub was prescribed by using a piecewise polynomial function. Finally, modified formulas for the optimum ratio of D1/D2 (D0=D1) were proposed via numerical simulations for the impeller with blade leading edge at the impeller eye, and simultaneously the blade angle was analyzed. Results show that the blade angel on the shroud surface shows a monotonic increasing tendency for the impeller with axial admission of air flows, different from that with radial admission of air flows. By calculation with above modified formulas to optimize the ratio of D1/D2, the whole-pressure polytropic efficiency can be improved by 5% within the scope of working conditions. © 2016, Editorial Department of Chinese Society of Power Engineering. All right reserved.
Zhang L.,Shanghai Fire Institute of MPS |
Liu J.,Hangzhou Steam Turbine Co. |
Liu S.,Shanghai Institute of Technology
Proceedings - 2012 International Conference on Computer Science and Service System, CSSS 2012 | Year: 2012
In this article, the rough set theory as the core algorithm combined with data pretreatment made up for its lack of itself, determine interest in degrees by using of analysis of confidence and support. Finally, establishment of the discernibility matrix, reduction of attributes and knowledge display by JAVA language combined with JAVA and MYSQL establish the typical JSP database applications. Intelligence asset management system based on data mining is established. Three functions, such as knowledge mining, knowledge management and the result forecast are achieved. © 2012 IEEE.
Xin J.,Dalian University of Technology |
Wang X.,Dalian University of Technology |
Zhou L.,Dalian University of Technology |
Ye Z.,Hangzhou Steam Turbine Co. |
Liu H.,Dalian University of Technology
Proceedings of the ASME Turbo Expo | Year: 2016
Based on Computational fluid dynamics (CFD) simulation, this study investigates the interior flow in a radial inlet, and helps to figure out the flow phenomenon in radial inlet and the aerodynamic load on the downstream impellers. Three different radial inlets, i.e., original model without guide vanes (OGV), with evenly distributed guide vanes (EGV) and with unevenly distributed of guide vanes (UGV) are considered. The results indicate that the performance of the compressor with UGV outperforms the others, which increases the polytropic efficiency of the centrifugal compressor by 2.3% and provides better flow parameter distribution. The inlet distortion created by the radial inlet affects the aerodynamic load distribution on the downstream impeller. Running unsteady simulations, the aerodynamic load on the impeller's leading edge is obtained for the three radial inlets. The dominant frequency and pulse amplitude obtained by Fast Fourier transforms (FFT), reveal that the main frequencies of the aerodynamic load present different distributions under three radial inlets. The UGV model provides the minimal amplitude value at machine rotating frequency when compared with the other two models, and the harmonics of the impeller passing frequency appear obviously, which is similar to that under the axial flow inlet condition. Copyright © 2016 by ASME.
Liu G.,Zhejiang University |
Feng Z.,Hangzhou Steam Turbine Co. |
Zhang M.,Zhejiang University |
Ke Y.,Zhejiang University
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2012
In a paper honeycomb fixing process, iron powder is used as a medium to transfer the friction force to fix the honeycomb part based on the principle of magnetic field and friction force. Three factors affect the final fixing result: the contact condition between the surface of the paper honeycomb and the platform, the filling height of the iron powder, and the filling area uniformity of the iron powder. In order to obtain the best fixture result, a compacting device based on distributed elastic springs and a filling device based on belt transmission are designed. Experiment shows that using the above devices will enable the honeycomb and platform to maintain close contact, and the height and area uniformity of the filling iron powder can meet the design requirements.
Zhang F.-S.,University of Shanghai for Science and Technology |
Zhang F.-S.,Hangzhou Steam Turbine Co. |
Dai R.,University of Shanghai for Science and Technology
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2011
On a planar cascade wind tunnel, experiment was designed to measure the wake flow downstream of a turbine guide vanes with cooling film jets at the designing incidence. Single row of discrete film holes is located on both suction and pressure surfaces. Blade profile losses were measured to compare the influences of film jets at various jet mass ratios. In experiment, the main and secondary jet flows were chosen the same fluid of air. Results showed that when jet flows are both present along suction and pressure surfaces, averaged profile loss tends to decrease at low jet ratios and increase at high jet ratios. However, decrease or increase differed from their variation slope. Along either suction or pressure sides, jet flow changed the wake structure. Influence of high pressure jet flow on loss magnitude will be dependant on its jet ratio. At low jet ratios, it can be neglected, but at high jet ratios, it has to be taken into account for accurate prediction of profile losses.
Fan C.,Zhejiang Sci-Tech University |
Zhang Y.,Zhejiang Sci-Tech University |
Zhu W.,Hangzhou Steam Turbine Co. |
Pan H.,Zhejiang Sci-Tech University
Proceedings of the 28th Chinese Control and Decision Conference, CCDC 2016 | Year: 2016
In this paper, a kind of wall-climbing robot based on wireless communication among multi-processors is introduced. Base on multi-processors controlled system, mechanical structure, electronic hardware construction and software designing are proposed respectively. Positioning and path planning are illustrated in detail. Furthermore, communicate protocol is proposed for data exchange through wireless transformation. The robot achieves high precise and excellent performance which could be applied in many fields such as shipbuilding and ship recycling. © 2016 IEEE.