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Investigation of heat sink of endothermic hydrocarbon fuels 总被引：2，自引：0，他引：2
Endothermic hydrocarbon fuels are advanced coolants for high-temperature structures of spacecraft. No data of tested-cooling-ability of endothermic fuels have been broadly discussed in literature. In this work a high-temperature flow calorimeter was designed, and the cooling capacity of six different hydrocarbon fuels were measured. Experimental results showed that these hydrocarbon fuels have capacity for cooling high-temperature structures, and that the cooling capacity of fuel N-l can reach 3.15 MJ/kg, which can nearly satisfy the requirement of thermal management for a Mach 3 cruise aircraft, whose heat sink requirement is about 3.5 MJ/kg. The endothermic velocity of hydrocarbon fuels was also measured by the calorimeter. 相似文献
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能源动力系统中CO_2减排是国际上的研究热点。国家自然科学基金委员会召开了以化石能源动力系统中温室气体控制的革新与制高点为主题的第56次双清论坛。围绕能源动力系统中减排CO_2相关的燃烧、碳迁移、分离与埋存、系统集成等核心问题展开讨论,凝练了该领域未来5年需要深入研究的关键科学问题,包括燃烧革新与CO_2回收、能量转换与碳迁移过程的耦合、CO_2运输和埋存中的工程热物理问题、能源动力系统与CO_2控制集成等,并就前沿和交叉科学问题研究、组织实施重大研究计划等提出建议。 相似文献
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The negative valve overlap (NVO) strategy of HCCI operation was experimentally investigated on a gasoline HCCI engine operated with variable valve timing in association with the addition of diesel fuel. The experimental results show that, by using gasoline and diesel blended fuels, the required NVO interval for suitable HCCI combustion under a given engine speed and a moderate compression ratio condition could be reduced, and the HCCI combustion region was extended remarkably without substantial increase in NOx emissions under a given inlet and exhaust valve timing due to the improvement of charge ignitability. In addition, the possible scale of NVO was extended. A substantial increase in the lean limit of excess air ratio and the upper limit of load range can be achieved because of higher volumetric efficiency, resulting from the decrease in the required NVO and the presence of less residual gases in cylinder. 相似文献
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全球化和信息技术革命是高等教育变革的主要动力,再加上成人学习者学习需求的增加、传统高等院校学费的增加等因素,在美国刺激了授予学位的营利性大学的发展。本文以凤凰大学为例,对美国营利性大学的发展进行研究,对其迅速崛起的动力进行探究,并讨论其发展带来的影响。 相似文献
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黎启飞 《上海海事大学学报》1996,(2)
对以内燃机为动力的液力传动叉车行驶工况下的燃油经济性计算进行了分析研究，并提出了一种较为简便、实用的计算方法，该方法经台架试验验证，其计算结果与实测值基本相符。 相似文献
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徐剑华 《上海海事大学学报》1990,(1)
本文对20多种有希望在21世纪替代石油的运输船舶能源进行了分析讨论。笔者认为,液化煤、水煤浆、页岩、焦油砂、甲醇和酒精等几种能源将有可能被广泛应用于船舶,并对核能、木炭、液化石油气、压缩天然气和植物油等能源用作船舶动力的局限性也进行了讨论。 相似文献
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HE Jiankun 《中国科学院院刊(英文版)》2014,(4):296-296
<正>In the context of global fight against the climate change and reductions in carbon emissions,a worldwide wave of energy system innovation has surged up.The traditional energy system dominated by fossil fuels will be replaced gradually by a new low-carbon energy system mainly supported by new and renewable sources of energy.The economic development of human society will not 相似文献
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The negative valve overlap (NVO) strategy of HCCI operation was experimentally investigated on a gasoline HCCI engine operated with variable valve timing in association with the addition of diesel fuel. The experimental results show that, by using gasoline and diesel blended fuels, the required NVO interval for suitable HCCI combustion under a given engine speed and a moderate compression ratio condition could be reduced, and the HCCI combustion region was extended remarkably without substantial increase in NO, , emissions under a given inlet and exhaust valve timing due to the improvement of charge ignitability. In addition, the possible scale of NVO was extended. A substantial increase in the lean limit of excess air ratio and the upper limit of load range can be achieved because of higher volumetric efficiency, resulting from the decrease in the required NVO and the presence of less residual gases in cylinder. 相似文献
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AbstractThe corporate control of energy production and the reach of fossil capital into civil and political society can be understood as a regime of obstruction that is preventing necessary action on climate change and blocking a just energy transition. In addition to overt forms of economic power and influence, hegemonic power is central to the fossil fuel industry’s regime of obstruction. Based on 29 interviews and an analysis of third-party teaching resources, this article shows how teaching practices and resources work to centre, legitimize, and entrench a set of beliefs relating to climate change, energy, and environmentalism that align with the interests of fossil fuel industry actors in Saskatchewan, Canada. We argue that these pedagogical practices promote student subjectivities consistent with neoliberal environmentalism centred on individual actions designed to insulate fossil fuel industries from criticism and dissuade young people from questioning or understanding the role of corporate power in the climate crisis. Furthermore, this petro-pedagogy intends to restrict the imagination of possible climate solutions to individual acts of conservation that fail to challenge the structural growth of fossil fuel consumption. This paper advances these teaching practices and resources as a ‘pedagogical arm’ of the regime of obstruction. 相似文献
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