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2D-simulation of wet steam flow in a steam turbine with spontaneous condensation

Journal of Marine Science and Application 2007年第2期6卷 59-63页

作者： SUN Lan-xin ZHENG Qun LIU Shun-long College of Power and Energy Engineering Harbin Engineering University Harbin 150001 China

Removal of condensates from wet steam flow in the last stages of steam turbines significantly promotes stage efficiency and prevents erosion of rotors. In this paper, homogeneous spontaneous condensation in transonic steam flow in the 2-D rotor-tip section of a stage turbine is investigated. Calculated results agree with experimental data reasonably well. On the basis of the above work, a 2-D numerical simulation of wet steam flow in adjacent root sections of a complex steam turbine stage was carded out. Computational results were analyzed and provide insights into effective removal of humidity.

关键词： steam turbine wet steam flow homogenous condensation Eulerian-Eulerian multiphase model

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Improvement of Heating Method for Measuring the wetness of flowing wet steam

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Journal of Thermal Science 1998年第3期7卷 202-207页

作者： Li YanFeng Wang XinJun Xu TingXiang(School of Energy and Power Engineering, Xi’an Jiaotong University Xi’an, Shed, 710049, China) School of Energy and Power Engineering Xi’an Jiaotong University Xi’an China

In this paper, an improvement of heating method for measuring wetness of the flowing wet steam is developed, the basic principle of the heating method is presented and the mathematical model has been built for analyzing the thermodynamics problezns during the process of heating. Moreover, an instru-ment for measuring wetness of wet steam flow was designed and made out. This instrument has been used for measuring wetness of the wet steam flow at the outlet of the nozzle rig in Thermal TUrbine Laboratory Xi’an Jiaotong University. By analyzing the relative error of the result, it was found that this instrument has fairly high accuracy it can be used as the prototype of practical instrument and has an important applicable value in engineering.

关键词： wetness measurement heating method wet steam flow

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Optimization of operating conditions in the steam turbine blade cascade using the black-box method

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Propulsion and Power Research 2023年第4期12卷 467-485页

作者： Vahid Sadrian Esmail Lakzian Davood Hoseinzade Behrad Haghighi M.M.Rashidi Heuy Dong Kim Center of Computational Energy Department of Mechanical EngineeringHakim Sabzevari UniversitySabzevarIran Department of Mechanical Engineering Andong National UniversityAndongSouth Korea Department of Mechanical Engineering Vali-e-Asr University of RafsanjanRafsanjanIran Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Faculty of Science University of JohannesburgPO Box 524Auckland Park 2006South Africa

Water droplets cause corrosion and erosion,condensation loss,and thermal efficiency reduction in low-pressure steam *** this study,multi-objective optimization was carried out using the black-box method through the automatic linking of a genetic algorithm(GA)and a computational fluid dynamics(CFD)code to find the optimal values of two design variables(inlet stagnation temperature and cascade pressure ratio)to reduce wetness in the last stages of *** wet steam flow numerical model was used to calculate the optimization parameters,including wetness fraction rate,mean droplet radius,erosion rate,condensation loss rate,kinetic energy rate,and mass flow *** the validation results showed a good agreement between the experimental data and the numerical *** to the optimization results,the inlet stagnation temperature and the cascade pressure ratio were proposed to be 388.67(K)and 0.55(-),*** particular,the suggested optimaltemperature and pressure ratio improved the liquid mass fraction and mean droplet radius by about 32%and 29%,***,in the identified optimal operating state,the ratios of erosion,condensation loss,and kinetic energy fell by 76%,32.7%,and 15.85%,respectively,while the mass flow rate ratio rose by 0.68%.

关键词： Black-box optimization wet steam flow steam turbine cascade Erosion rate Condensation loss

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