检索结果-南通市图书馆

Exploration of combined adjustment laws about IGV,stator and rotational speed in off-design conditions in an axial compressor

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2010年第4期53卷 969-975页

作者： HU YanMing1,2 & NIE ChaoQun1 1 Key Laboratory of Advanced Energy and Power Technology,Institute of Engineeting Thermophysics,Chinese Academy of Science,Beijing 100190,China 2 Graduate School of Chinese Academy of Sciences,Beijing 100190,China 1. Key Laboratory of Advanced Energy and Power Technology Institute of Engineeting Thermophysics Chinese Academy of Science Beijing 100190 China2. Graduate School of Chinese Academy of Sciences Beijing 100190 China

Experimental investigations are performed in a three-stage low-speed axial compressor with variable inlet guide vanes(IGV) and adjustable *** characteristics of the compressor,especially the efficiency and stall margin,are analyzed in design and off-design operation conditions by adjusting stagger angles of IGV and stators as well as changing the rotational *** experimental results show that the off-design performance of the multistage axial compressor is improved by restaggering of IGV and stators related to rotational *** the background of engineering applications,digital signal processing(DSP) technique is used to realize online adjustment of stagger angles according to the corresponding relations between incidence angles of rotor and rotational speed.

关键词： axial compressor IGV surge DSP techniques off-design

Comparison and Error Analysis of off-design and design Models of Energy Hubs

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2019年第4期5卷 454-465页

作者： J.H.Zheng Jun Huang Shan Deng Q.H.Wu Mengshi Li Xiaoxin Zhou Zhaoxia Jing School of Electric Power Engineering South China University of TechnologyGuangzhou 510006China China Electric Power Research Institute Beijing 100192China

The accuracy of the simulation model has a pro-found impact on the optimal operation of the energy hubs(EHs).However,in many articles,the constant model of the efficiency of equipment is adopted to formulate the operation system,which would probably lead to a simplification of the simulation ***,EHs are typically operated under off-design condition due to the fluctuations in cooling,heating,electricity ***-over,even though the off-design characteristics are considered,few studies have suggested comparing the differences between those two models by considering the operation *** order to assess the effect of the off-design characteristics of EH on the optimal operation accuracy in this paper,two test cases are performed on the fixed and variable load conditions,*** addition,the individual effect of off-design characteristics of each equipment on the optimal operation cost of the EH is also investigated through four optimization *** is worth mentioning that the optimal operation problem of the EH considering the off-design characteristics and on-off status of the equipment is a mixed integer non-linear programming problem(MINLP).By testing the design and off-design models on the two cases,the results of simulation demonstrate that the optimal operation cost for the off-design model is larger than that for the design ***,in the aspect of the authenticity of the system operation strategy,the off-design model performs better than the design ***,a larger relative error of the system operation cost between the two models can be observed when the EH is operated under a relatively lower load condition,revealing that the influence of off-design characteristic on the optimal operation of EHs is too significant to be neglected.

关键词： design energy hubs MINLP off-design optimal operation

off-design Modelling of a Turbo Jet Engine with Operative Afterburner

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Energy Efficiency 2022年第3期11卷 88-107页

作者： O. O. Ighodaro E. I. Aburime A. A. Erameh Department of Mechanical Engineering State University of Benin Benin City Nigeria Department of Chemical Engineering University of Benin Benin City Nigeria Department of Mechanical Engineering Igbinedion University Okada Nigeria

Gas turbines are considered as one of the leading internal combustion engines in modern air transportation due to its favourable power to weight ratio and its continuous combustion process. Recent research focus has been concerned with performance improvements aimed at reduced fuel consumption and hence reduced impact on the environment. This study is aimed at using theoretical and computational methods to model the operation and performance a turbojet gas turbine engine. The commercial software GasTurb13 was used for the theoretical simulation while Microsoft Excel was used for the analytical study. GasTurb13 solved the model using pseudo-perfect gas models i.e. component maps since the specific gas ratio could not be inputted into the solver. The effect of changes in the Mach number and altitude on the engine performance was studied. Also the effect of changes in the compressor pressure ratio, the turbine inlet temperature and the afterburner exit temperature were also studied. Results obtained showed the optimum pressure ratio at maximum thrust constraint to be 16.78 for the turbojet engine operating at Mach number (Ma) = 0.8 and altitude = 10,000 m, Turbine inlet temperature (TIT) = 1200 K and Afterburner exit temperature = 1800 K.

关键词： Turbo Jet Engine Modelling Simulation off-design

Performance Back-deduction from a Loading to Flow Coefficient Map:Application to Radial Turbine

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2012年第6期21卷 509-517页

作者： Xavier CARBONNEAU Nicolas BINDER Université de Toulouse Institut Supérieur de l'Aéronautique et de l'Espace(ISAE)10avenue Edouard Belin BP 54032 31400 ToulouseFrance

Radial turbine stages are often used for applications requiring off-design operation,as turbocharging for *** off-design ability of such stages is commonly analyzed through the traditional turbine map,plotting the reduced mass-flow against the pressure-ratio,for reduced-speed ***,some alternatives are possible,such as the flow-coefficient(Ψ)to loading-coefficient(φ)diagram where the pressure-ratio lines are actually straight lines,very convenient property to perform prediction.A robust method re-creating this map from a predicted Ψ-φ diagram is *** work has shown that this back-deduction quality,without the use of any loss models,depends on the knowledge of an intermediate pressure-ratio.A modelization of this parameter is then *** comparison with both experimental and CFD results is presented,with quite good agreement for mass flow rate and rotational speed,and for the intermediate pressure *** last part of the paper is dedicated to the application of the intermediate pressure-ratio knowledge to the improvement of the deduction of the pressure ratio lines in the Ψ-φ *** this improvement,the back-deduction method of the classical map is structured,applied and evaluated.

关键词： Radial turbine off-design flow coefficient load coefficient performance

Robust design and analysis of a conformal expansion nozzle with inverse-design idea

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2018年第1期31卷 79-88页

作者： Wenbiao GAN Xiaocui ZHANG Tielin MA Qinling ZHANG Wu YUAN Research Institute of Unmanned System Beihang University The First Aircraft Institute Aviation Industry Corporation of China Computer Network Information Center Chinese Academy of Sciences

This paper examines robust optimization design and analysis of a conformal expansion nozzle of flying wing Unmanned Aerial Vehicle （UAV） with the inverse-design idea. In view of flow features and stealth constraints, the inverse-design idea is described and the uncertainty-based robust design model is presented. A robust design system employs this model to combine deterministic optimization and robust optimization and is applied into design of a conformal expansion nozzle. The results indicate that design optimization can conform to the anticipation of the inversedesign idea and significantly improve the aerodynamic performance that meet the requirement of 6σ. The present method is a feasible nozzle design strategy that integrates robust optimization and inverse-design.

关键词： Aerodynamic analysis Inverse-design Nozzle off-design Robust optimization

Numerical Investigation and Non-Axisymmetric Endwall Profiling of a Turbine Stage

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2019年第4期28卷 811-825页

作者： REHMAN Abdul LIU Bo School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine Xi’an 710072China

This paper presents an optimization of a high pressure turbine by constructing non-axisymmetric endwalls to the stator row and the rotor *** optimization was quantified by using optimization algorithms based on the multi-objective *** objective was to increase total-to-total efficiency with the constraint on the mass flow rate equal to the design point *** order to ensure that global optimum could be achieved,the function of parameters was first approximated through the artificial neural network,and then optimum was achieved by implementing the genetic *** was adopted through the design and optimization environment of FineTM/design3 *** individual treatments of the endwalls were ***,the hub and the shroud of the stator were optimized ***,the hub of the rotor was ***,the rotor hub was optimized in the presence of the optimized *** result of the investigation showed that the optimized shape of the endwalls can significantly help to increase the efficiency up to 0.18%with the help of a reduction of the transverse pressure *** coefficient of secondary kinetic energy,entropy coefficient,spanwise mass averaged entropy were *** order to investigate the periodic effects,the design of the optimized turbine under steady simulations was confirmed through unsteady *** last part of the investigation made sure that the performance improvement remained consistent over the full operating line at off-design conditions by the implementation of non-axisymmetric endwalls.

关键词： optimization non-axisymmetric endwall high pressure turbine stage efficiency secondary kinetic energy steady unsteady off-design

Component Matching Based on Low Bypass Ratio Mixed Exhaust Turbofan Engine

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2018年第S1期35卷 9-15页

作者： Zheng Xilong Wu Tieying Ji Honghu College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics

In order to study component matching which exists in off-design situation at the initial design stage of turbine engine,by establishing performance analysis model of low bypass ratio mixed flow turbofan engine and components characteristic data,and by applying Newton-Raphson method to solve the nonlinear equations of offdesign points in flying envelop,the factors which affect matching between engine components are *** results show that low pressure turbine(LPT)must not operate in a critical condition,and the partial derivative(slope)of pressure ratio to similitude mass flow ratio of working point in LPT characteristic map affects the stability of *** smaller the slope is,the more stable the engine *** addition,the engine is more stable when the fan characteristic map is steep.

关键词： turbofan engine low bypass ratio off-design component matching OOP performance analysis

工业燃气涡轮发动机变工况性能直接预测（英文）

在线全文

学校读者我要写书评

暂无评论

风机技术 2018年第6期60卷 38-44页

作者： Leonid Moroz Valentyn Barannik Maksym Burlaka Abdul Nassar Soft In Way Inc. 1500 DistrictAve Burlington MA USA Soft In Way Turbomachinery Solutions Pvt. Ltd Bangalore KA India

The modern gas turbine engine has been used in current power generation industry for almost half a century. Gas turbines are designed to operate with the best efficiency during normal operating conditions and at specific operating points. However, the real world is non-optimal and the engine may have to operate at off-design conditions due to load requirements, different ambient temperatures, fuel types, relative humidity and driven equipment *** more and more base-load gas turbines have to work today on partial load too, which can affect the hot gas path condition and life expectancy. At these off-design conditions, gas turbine's efficiency and life deterioration rate might significantly deviate from the design specifications. During a gas turbine's life, power generation providers might need to perform several overhauls or upgrades for their engines. Thus, the off-design performance after the overhaul also might be changed. Prediction of gas turbine's off-design performance is essential to economical operation of power generation equipment. In this paper, an integrated system for complex design and off-design performance prediction(Ax STREAM? Platform) is presented. It allows to predict gas turbine engine's design and off-design performance almost automatically. Each component's performance such as turbine, compressor, combustor and entire secondary flow(cooling) system is directly and simultaneously calculated for every off-design performance request, making possible to build an off-design performance map including cooling system. The example of off-design performance estimation of industrial gas turbine engine is presented. The presented approach provides wide capabilities for optimization of operation modes of industrial gas turbine engines and other complex turbomachinery systems for every specific operation conditions(environment, grid demands and other factors).

关键词： Virtual Gas Turbine Unit Gas Turbine Unit off-design Mode Power Control Cooling System Control Efficiency Improvement

Study on Operating Characteristics of Power Plant with Dry and Wet Cooling Systems

在线全文

学校读者我要写书评

暂无评论

Energy and Power Engineering 2013年第4期5卷 651-656页

作者： Tao Tang Jian-qun Xu Sheng-xiang Jin Hong-qi Wei Beijing Energy Company Limited Beijing China School of Energy and Environment Southeast University Nanjing China

The represent paper will study the performance of the power plant with the combination of dry and wet cooling systems in different operating conditions. A thermodynamic performance analysis of the steam cycle system was performed by means of a program code dedicated to power plant modeling in design operating condition. Then the off-design behavior was studied by varying not only the ambient temperature and relative humidity but also several parameters connected to the cooling performance, like the exhaust steam flow rate, the air cooling fan load and the number of operating cooling water pumps and cooling towers. The result is an optimum set of variables allowing the dry and wet cooling system be regulated in such a way that the maximum power is achieved and low water consumption.

关键词： Dry and Wet Condenser Cooling Tower off-design Characteristic Curve Operational Optimization