Two different entry vehicles are presented here： the Inflatable Reentry and Descent Demonstrator （IRDT）, and Huygens. Both missions involve （re）entries at conditions close to orbital, and have been performed in 2...Two different entry vehicles are presented here： the Inflatable Reentry and Descent Demonstrator （IRDT）, and Huygens. Both missions involve （re）entries at conditions close to orbital, and have been performed in 2005. Specific aspects of the design and the mission of IRDT are briefly outlined. The preliminary results of the recent flight of IRDT and the methodology followed at ESTEC for the assessment of radiative fluxes for Huygens are summarised.展开更多
A pulsed-wire wall probe measurement system was developed in this paper,which can be used for measuring wall Parameters in separated flow- The operating princi-ple was described and the way of probe calibration was gi...A pulsed-wire wall probe measurement system was developed in this paper,which can be used for measuring wall Parameters in separated flow- The operating princi-ple was described and the way of probe calibration was given. Wall parameters of back-ward-facing and forward-facing step flow were measured,and the wall nows structure andcharacters were revealed.展开更多
选取适合于双探针型海底热流计数据解算的简化模型,是双探针型海底热流计结构优化的理论基础,对提高海底热流数据解算精度具有重要意义。本文基于脉冲式双探针海底工作的有限元数值模型,对双探针的脉冲加热时间、体生热率、热物性、长...选取适合于双探针型海底热流计数据解算的简化模型,是双探针型海底热流计结构优化的理论基础,对提高海底热流数据解算精度具有重要意义。本文基于脉冲式双探针海底工作的有限元数值模型,对双探针的脉冲加热时间、体生热率、热物性、长度及半径等因素在双探针脉冲法的3个线热源简化模型中所引起的模型误差作了详细的分析和讨论,并以模型误差最小为原则选取简化模型。结果表明:1)脉冲加热有限长线热源(PFLS:pulsed finite line source)模型是双探针脉冲法中较为实用的简化模型,它可消除加热时间和探针长度对介质热物性参数求解的影响;2)在PFLS模型下,探针热导率对待测介质热物性测量的影响可以忽略;而探针间距越大、半径越小及其体积比热容与待测介质越接近,则所求介质热物性的模型误差就越小;在保证温度传感器能有效记录到温度变化的前提下,探针脉冲功率的大小基本不影响介质热物性求解的模型误差。展开更多
文摘Two different entry vehicles are presented here： the Inflatable Reentry and Descent Demonstrator （IRDT）, and Huygens. Both missions involve （re）entries at conditions close to orbital, and have been performed in 2005. Specific aspects of the design and the mission of IRDT are briefly outlined. The preliminary results of the recent flight of IRDT and the methodology followed at ESTEC for the assessment of radiative fluxes for Huygens are summarised.
文摘A pulsed-wire wall probe measurement system was developed in this paper,which can be used for measuring wall Parameters in separated flow- The operating princi-ple was described and the way of probe calibration was given. Wall parameters of back-ward-facing and forward-facing step flow were measured,and the wall nows structure andcharacters were revealed.
文摘选取适合于双探针型海底热流计数据解算的简化模型,是双探针型海底热流计结构优化的理论基础,对提高海底热流数据解算精度具有重要意义。本文基于脉冲式双探针海底工作的有限元数值模型,对双探针的脉冲加热时间、体生热率、热物性、长度及半径等因素在双探针脉冲法的3个线热源简化模型中所引起的模型误差作了详细的分析和讨论,并以模型误差最小为原则选取简化模型。结果表明:1)脉冲加热有限长线热源(PFLS:pulsed finite line source)模型是双探针脉冲法中较为实用的简化模型,它可消除加热时间和探针长度对介质热物性参数求解的影响;2)在PFLS模型下,探针热导率对待测介质热物性测量的影响可以忽略;而探针间距越大、半径越小及其体积比热容与待测介质越接近,则所求介质热物性的模型误差就越小;在保证温度传感器能有效记录到温度变化的前提下,探针脉冲功率的大小基本不影响介质热物性求解的模型误差。
