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.
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.
Geng W.,Xian Jiaotong University |
Dan H.,Hangzhou Steam Turbine Co. |
Chen C.,Xian Jiaotong University |
Li J.,Xian 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.
Gao Z.-W.,Zhejiang Institute of Mechanical and Electrical Engineering |
Wang R.-Q.,Zhejiang Institute of Mechanical and Electrical Engineering |
Zhang H.-Z.,Hangzhou Steam Turbine Co. |
Wang J.-F.,Fushun Special Steel Shares Co.
Zhuzao/Foundry | Year: 2014
Comparing with normal casting process, adopting insulating pads design and chills set in concentrated feeding process of medium carbon alloy steel castings (rollers) has decreased the amount of risers from 8 to 2 while the yield of casting has improved from 58% to 73%. This process design can not only save iron melt, but also reduce casting cleaning work in the later stage. At the same time, CAE software was used to optimize and verify the process by setting casting process parameters. The production shows that the process meets the requirements of casting quality and enables current casting production conditions to produce qualified castings successfully. ©, 2014, Zhuzao/Foundry. All right reserved.
Song J.,Tsinghua University |
Xu J.-J.,Hangzhou Steam Turbine Co. |
Li Y.,Tsinghua University |
Gu C.-W.,Tsinghua University
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2014
In this paper, an Organic Rankine cycle system using medium and low-grade solar energy is established, and the net power output reaches 100 kW. An organic radial turbine is designed for the system. According to the CFD simulation results, there is little difference between the calculated value and the design value, thus the design of turbine in this paper meets the requirements. The flow state of the organic working fluid in the turbine is fine and no separating vortex exists in the turbine. The system designed in this paper can be applied in utilization of medium and low-grade solar energy, and it can provide guidance for practical uses in the near future.