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内流热环境的热流模拟方法 被引量:4
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作者 涂建强 刘德英 陈连忠 《宇航材料工艺》 CAS CSCD 北大核心 2009年第2期30-33,共4页
对内流热环境的热流测量方法进行了试验研究和模拟,对比分析了内流热环境与外流热环境的不同。采用超声速矩形湍流导管试验技术,利用等离子电弧加热器进行了内流与外流热环境的表面冷壁热流测量和材料考核试验。结果表明:在来流条件相... 对内流热环境的热流测量方法进行了试验研究和模拟,对比分析了内流热环境与外流热环境的不同。采用超声速矩形湍流导管试验技术,利用等离子电弧加热器进行了内流与外流热环境的表面冷壁热流测量和材料考核试验。结果表明:在来流条件相同的情况下,与外流热环境下的测量值相比较,内流热环境下的冷壁热流值高出40%多,相同材料的背面温度高出400℃。通过直接测量的冷壁热流换算得到的热壁热流值却不到外流热环境下的热壁热流值的50%。因此,进行发动机防热设计时,必须进行材料考核试验,必须考虑材料的使用热环境,否则对材料的烧蚀性能的评估影响很大。 展开更多
关键词 内流热环境 外流热环境 热流模拟方法 热流密度 电弧加热器
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Two Unconditional Stable Schemes for Simulation of Heat Equation on Manifold Using DEC
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作者 谢正 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第2期321-324,共4页
To predict the heat diffusion in a given region over time, it is often necessary to find the numerical solution for heat equation. However, the computational domain of classical numerical methods are limited to fiat s... To predict the heat diffusion in a given region over time, it is often necessary to find the numerical solution for heat equation. However, the computational domain of classical numerical methods are limited to fiat spacetime. With the techniques of discrete differential calculus, we propose two unconditional stable numerical schemes for simulation heat equation on space manifold and time. The analysis of their stability and error is accomplished by the use of maximum principle. 展开更多
关键词 discrete exterior calculus discrete manifold heat equation
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A decoupled procedure for convection-radiation simulation in scramjets 被引量:6
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作者 WANG Jing Ying GAO Zhen Xun +1 位作者 LEE Chun Hian ZHANG Hui Qiang 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第12期2551-2566,共16页
Following an order analysis of key parameters, a decoupled procedure for simulation of convection-radiation heat transfer problems in supersonic combustion ramjet(scramjet) engine was developed. The radiation module o... Following an order analysis of key parameters, a decoupled procedure for simulation of convection-radiation heat transfer problems in supersonic combustion ramjet(scramjet) engine was developed. The radiation module of the procedure consisted of Perry 5GG weighted sum gray gases model for spectral property calculation and discrete ordinates method S4 scheme for radiative transfer computation, while the flow field was computed using the Favrè average conservative Navier-Stokes(N-S) equations, in conjunction with Menter's k-ω SST two-equation model. A series of 2D supersonic nonreactive turbulent channel flows of radiative participants with selective parameters were simulated for validation purpose. Radiative characteristics in DLR hydrogen fueled and NASA SCHOLAR ethylene fueled scramjets were numerically studied using the developed procedure. The results indicated that the variations of spatial distributions of the radiative source and total absorption coefficient are highly consistent with those of the temperature and radiative participants, while the spatial distribution of the incident radiation spreads wider. It also demonstrated that the convective heating is significantly affected by the complexity of the flow field, such as the shock wave/boundary layer interactions, while the radiative heating is simply an integral effect of the whole flow field. Although the radiative heating in the combustion chambers reaches a certain level, an order of magnitude of 10 k W/m2, it still contributes little to the total heat transfer(<7%). 展开更多
关键词 SCRAMJET radiative heating convective heating turbulent combustion decoupled procedure
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Effects of pulse flow and leading edge sweep on mixed flow turbines for engine exhaust heat recovery 被引量:2
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作者 ZHANG YangJun CHEN Li +1 位作者 ZHUGE WeiLin ZHANG ShuYong 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第2期295-301,共7页
Recovery of heat energy from internal combustion engine exhaust will achieve significant road transportation CO2 reduction. Turbocharging and turbogenerating are most commonly used technologies to recover engine exhau... Recovery of heat energy from internal combustion engine exhaust will achieve significant road transportation CO2 reduction. Turbocharging and turbogenerating are most commonly used technologies to recover engine exhaust heat energy.Engine exhaust pulse flow can significantly affect the turbine performance of turbocharging and turbogenerating systems,and it is necessary to consider the pulse flow effects in turbine design and performance analysis.An investigation was carried out by numerical simulation on the mixed flow turbine pulse flow performance and flow fields.Results showed that the variations of the turbine efficiency and flowfiled under pulsating flow conditions demonstrate significant unsteady effects.The effect of blade leading edge sweep on turbine pulse flow performance was studied.It is shown that increasing of the leading edge sweep angle can improve the turbine average instantaneous efficiency by about 2 percent under pulsating flow conditions. 展开更多
关键词 waste heat recovery mixed flow turbine pusle flow
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