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Theoretical investigation on water/metal fuel ramjet motor-thermodynamic cycle and thermodynamic calculation

航空动力学报 2010年第5期25卷 1129-1138页

作者： YANG Ya-jing HE Mao-gang School of Aerospace Xi'an Jiaotong UniversityXi'an 710049China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China

For achieving high-speed requirement of underwater vehicle,a conceptual engine,which utilizes the hydroreactive characteristic of several metals under supercavitation environment,has been put forward. Especially,in order to obtain specific impulse as great as possible,a dual water injection system is taken into account. Then thermodynamic cycle model,which lead the improvement of power plant and energy system,is introduced in detail,and thermal efficiency is also analyzed. Furthermore,for investigating the performance of this kind of engine system,detailed thermodynamic calculation and analysis are achieved. Especially,regarding hydroreactive metal fuel Mg/AP/HTPB as our target fuel-rich propellant,considering its obvious deficient oxygen property and the energy property of magnesium/water reaction,theoretical calculation method is established by integrating chemical non-equilibrium with chemical equilibrium. Accordingly,low limit of primary water/fuel ratio is determined. In addition,the qualitative and quantitative relationship of performance parameters,such as theoretical specific impulse,nozzle exit temperature,characteristic velocity,etc.,versus water/fuel ratio is investigated respectively.

关键词： hydroreactive metal fuel water ramjet thermodynamic cycle thermal efficiency specific impulse

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Insights into thermodynamic performance of a hypersonic precooled air-breathing engine with a complicated multi-branch closed cycle

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Chinese Journal of Aeronautics 2024年第8期37卷 106-123页

作者： Yifan WANG Zhengping ZOU Pengcheng DU Lichao YAO Huoxing LIU Yusen XU Research Institute of Aero-Engine Beihang UniversityBeijing 102206China National Key Laboratory of Science and Technology on Aero-Engine and Aero-thermodynamics Beihang UniversityBeijing 102206China

An advanced precooled airbreathing engine with a closed Brayton cycle is a promising solution for high-speed propulsion,of which the Synergetic Air Breathing Rocket Engine(SABRE)is a representative *** performance of the latest SABRE-4 cycle was analyzed in this ***,a relatively complete engine performance model that considers the characteristics of turbomachinery and heat exchangers was ***,Sobol’global sensitivity analysis of key performance parameters was carried out to identify the most influential design *** specific impulses under different target specific thrusts were obtained by particle swarm optimization,of which the thermodynamic parameters corresponding to a specific thrust of 1.12 kN·s·kg^(-1)and a specific impulse of 3163 s were chosen as the design *** different control laws were analyzed in contrast,and the charge control method had the strongest ability of thrust regulation as well as maintaining a favorable specific impulse ***,working characteristics under the charge control and over a typical flight envelope were calculated,in which the average value of the maximum specific impulse was as high as 5315 *** study would help to deepen the understanding of SABRE-4 thermodynamic characteristics and other precooled airbreathing engine cycles with similar layouts.

关键词： Hypersonic Precooled airbreathing engine thermodynamic cycle Control law Working characteristics

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Life cycle evaluation of an intercooled gas turbine plant used in conjunction with renewable energy

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Propulsion and Power Research 2016年第3期5卷 184-193页

作者： Thank-God Isaiah Siddig Dabbashi Dawid Bosak Suresh Sampath Giuseppina Di Lorenzo Pericles Pilidis Department of Power and Propulsion School of EngineeringCranfield UniversityCranfieldBedfordshire MK430ALUnited Kingdom

The life cycle estimation of power plants is important for gas turbine *** the introduction of wind energy into the grid,gas turbine operators now operate their plants in Load–Following modes as back-ups to the renewable energy sources which include wind,solar,*** motive behind this study is to look at how much life is consumed when an intercooled power plant with 100 MW power output is used in conjunction with wind *** operation causes fluctuations because the wind energy is unpredictable and overtime causes adverse effects on the life of the plant–The High Pressure Turbine *** fluctuations give rise to low cycle fatigue and creep failure of the blades depending on the operating regime used.A performance based model that is capable of estimating the life consumed of an intercooled power plant has been *** model has the capability of estimating the life consumed based on seasonal power demands and *** in-depth comparison was undertaken on the life consumed during the seasons of operation and arrives at the conclusion that during summer,the creep and low cycle life is consumed higher than the rest periods.A comparison was also made to determine the life consumed between Load–Following and stop/start operating *** was also observed that daily creep life consumption in summer was higher than the winter period in-spite of having lower average daily operating hours in a Start–Stop operating scenario.

关键词： Gas turbines Life cycle Load–Following Power demand Renewable energy thermodynamic cycle Thermal efficiency

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Particle path tracking method in two- and three-dimensional continuously rotating detonation engines

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Chinese Physics B 2014年第12期23卷 307-315页

作者：周蕊武丹刘岩王健平 State Key Laboratory of Turbulence & Complex Systems Center for Applied Physics and TechnologyDepartment of Mechanics and Engineering Science College of Engineering Peking University

The particle path tracking method is proposed and used in two-dimensional（2D） and three-dimensional（3D） numerical simulations of continuously rotating detonation engines（CRDEs）. This method is used to analyze the combustion and expansion processes of the fresh particles, and the thermodynamic cycle process of CRDE. In a 3D CRDE flow field, as the radius of the annulus increases, the no-injection area proportion increases, the non-detonation proportion decreases, and the detonation height decreases. The flow field parameters on the 3D mid annulus are different from in the 2D flow field under the same chamber size. The non-detonation proportion in the 3D flow field is less than in the 2D flow field. In the 2D and 3D CRDE, the paths of the flow particles have only a small fluctuation in the circumferential direction. The numerical thermodynamic cycle processes are qualitatively consistent with the three ideal cycle models, and they are right in between the ideal F–J cycle and ideal ZND cycle. The net mechanical work and thermal efficiency are slightly smaller in the 2D simulation than in the 3D simulation. In the 3D CRDE, as the radius of the annulus increases, the net mechanical work is almost constant, and the thermal efficiency increases. The numerical thermal efficiencies are larger than F–J cycle, and much smaller than ZND cycle.

关键词： continuously rotating detonation engine thermodynamic cycle numerical simulation particle path tracking method

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The Thermofluids Design of a 100 KW,Single-Shaft Prototype Microturbine as a New Distributed Generation Method in Iran

The Thermofluids Design of a 100 KW,Single-Shaft Prototype M...

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2011 2nd International Conference on Advances in Energy Engineering(ICAEE)

作者： S.Ziaei Tabatabaei A.Hashemi A.Meysami A.Zolghadr Shojai Mechanical Department of Niroo Research Institute

Considering the increasing role of microturbines in distributed generation of combined heat and power（CHP）,the localization of microturbine design and manufacturing technology has received great importance in *** a complete and comprehensive algorithm can be a major step in reaching the *** this paper,we present the cycle for the thermofluids design of a 100 KW microturbine which is carried out at the Niroo Research Institute of Iran to simultaneously generate both electricity and useful *** characteristics of this system are as follows:revolution speed of 47750 rpm,single shaft,natural gas as fuel,single stage radial turbine/compressor and annular combustion *** on the thermodynamic characteristics of the cycle,the characteristics of different components of microturbine are determined throughout the *** to the determined values,we expect the cycle to achieve an efficiency of approximately 13%without the recuperator and 25%with the *** must be noted that the designed microturbine is going through the final assembly stages at the time and the performance test has not been conducted ***,the over-all characteristics curve of the system was not available at the time of preparing this article.

关键词： Microturbine Distributed generation thermodynamic cycle Conceptual design

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Free Energy Calculation along High-Dimensional Fragmental Path with Constrained Dynamics

Free Energy Calculation along High-Dimensional Fragmental Pa...

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第五届全国生物信息学与系统生物学学术大会暨国际生物信息学前沿研讨会高通量时代的生物信息学与系统生物学

作者： Changjun Chen Yanzhao Huang Yi Xiao Biomolecular Physics and Modeling Group Department of Physics Huazhong University of Science and Technology

Background:The binding free energy is the most important physical parameter that reveals the binding affinity of the receptor-ligand *** the past,this value could be obtained based on the thermodynamic cycle *** is,use gas-to-solvent solvation energy of independent monomers and interaction energy between them in gas phase to get the binding free energy of complexes in *** strategy is practical and widely used, but it is difficult to give accurate results if the receptor and/or ligand has large conformational changes before and after binding,which happens often in practice. Methods:In our work,constrained dynamics along fragmental and high-dimensional transition path connecting bound and unbound states is *** both bound and unbound states are considered in the simulation,this method could handle the structural flexibility in the binding free energy ***,conventional constrained dynamics could only handle simple reaction coordinates for simple state-to-state transition. We use fragmental paths to overcome this problem and make the constrained dynamics easy to implement in the high-dimensional transitions. Results:the main *** an example,we apply the method for the calculation of the binding free energy of calmodulin loop-calcium *** results are in good agreement with the experiment. Conclusions:In summary,the free energy method based on constrained dynamics may be an alternative promising method to compute the protein-ligand binding affinity.

关键词： Free energy calculation thermodynamic cycle Molecular Simulation Calmodulin

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