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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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Experimental study on the ignition and combustion characteristics of a magnesium particle in water vapor

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Science China(Technological Sciences) 2012年第9期55卷 2601-2608页

作者： HUANG Xu XIA ZhiXun HUANG LiYa HU JianXin Science and Technology on Scram jet Laboratory National University of Defense TechnologyChangsha 410073China College of Aerospace and Materials Engineering National University of Defense TechnologyChangsha 410073China

Magnesium is of interest for underwater propulsion due to the superior ignition behavior of magnesium particles and the highly exothermic Mg-water *** this work,the ignition and combustion characteristics of an individual millimeter-sized magnesium particle in water vapor were *** order to build an atmosphere of water vapor,an experiment system was established and validated by the experiments of magnesium particle in *** ignition and combustion of a single magnesium particle were accomplished in a combustor filled with water *** surface changes of the particle during the ignition and a steady-state vapor phase combustion were *** on the data obtained,ignition mechanism was analyzed and ignition temperature was *** steady-state combustion of the sample was controlled by diffusion in gas phase,and a one-dimensional,spherically symmetric quasi-steady model was adopted to describe the *** dependence of burning time on the diameter was investigated,and the conclusion that burning time is proportional to the square of the metal sample diameter was drawn.

关键词： magnesium particle water vapor ignition combustion experiment water ramjet

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Numerical investigation of flow unsteadiness and heat transfer on suction surface of rotating airfoils within a gas turbine cascade

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Propulsion and Power Research 2017年第2期6卷 91-100页

作者： Liang Guo Yuying Yan Wanchen Sun Jie Zhu State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China Fluids&Thermal Engineering Research Croup.Faulty of Engineering University of Nottingham.Nottingham NG72RDUnited Kingdom

The effects of the periodical turbulence and pressure fluctuation on suction surface heat transfer over airfoils of a row of rotor blades with a certain type have been investigated numerically in this *** calculation is perfomed using v^(2)-f model with the numerical results of pressure fluctuation and heat transfer performance over 4 sample points being analyzed and compared with existing experimental *** shows that the static pressure change has significant impact on heat transfer performance of the fore suction surface,especially in the active region of the shock waves formed from the trailing edge of upstream ***,for the rear suction surface,the flow turbulence contributes more to the heat transfer change over the surface,due to the reduced pressure oscillation through this *** shifted phenomenon across the surface can be observed for both pressure and heat transfer parameters,which should be a result of turbulence migration and wake passing across the airfoil.

关键词： Gas turbinecascade water ramjet Flow unsteadiness Pressure fluctuation Heat transfer Blade suctionsurface

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