共查询到20条相似文献，搜索用时 203 毫秒
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分析了高原地区汽油机车晚拉生气阻的原因，指出自然环境，油品品质，车辆供油系统结构和人为因素是导致气阻产生的主要因素。提出采用改变汽油滤清器的安装方式。调整汽车特性参数，增强油路和排气系统的隔热与散热能力，优化输油管道设计，换用晶体电动泵，选用高馏分汽油或采用高分子材料涂覆输油管路等方法，对防治高原地区汽油机车的气阻效果显著。 相似文献
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火车卸槽时的气阻及其影响因素 总被引：2，自引：0，他引：2
由于设计与结构原因，火车卸槽时易产生气阻。分析了气阻产生的原因，给出了减轻气阻以及避免气阻的方法。提出只要选用合适的泵和适当的输油工艺参数就可以避免气阻。 相似文献
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在汽油机空燃比控制中，需要监视汽油机动力性变化。本文介绍了汽油机动力信号的采集系统和数据处理，并经实验证实。 相似文献
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在田间采用筒测法和田测法进行积水入渗土壤气阻变化规律及其机理的试验研究，结果表明，积水入渗过程中土壤内空气有一定压力，这一压力对入渗水流产生阻力作用，同时会减小入渗速度。文中列出了气阻减小入渗指数和系数的关系式 相似文献
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在田间采用筒侧法和田测法进行积水入渗土壤气阻变化规律及其查理的试验研究，结果表明，积水入渗土壤内空气有一定压力，这一压力对入渗水充产生阻力作用，同时会小入渗速度。文中列出了气阻减小入渗指数和系数的关系式。 相似文献
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以93#无铅汽油为基础油,按照体积分数配制出20%的丁醇-汽油混合燃料,研究了电喷汽油机在不作改动的情况下燃用高掺混比丁醇-汽油混合燃料时的动力性和经济性变化情况.研究结果表明,在不改变汽油机任何参数的情况下,与原汽油机相比,20%体积掺混率的丁醇-汽油混合燃料动力性相差不大,低转速性能还稍有提高,而CO和HC的排放则有明显的改善. 相似文献
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文章推出“低气压辅助卸汽油工艺”,并通过试验数据论述了空气溶解度、溶解速度及降压后释放量等对油气损耗、气阻、气蚀和油品质量的影响程度。笔者的结论:该工艺是克服气阻、气蚀且经济易行的好方法。 相似文献
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介绍了供给汽油机稀混合气的方法和系统,分析了混合气逐步变稀时对汽油机性能的影响;提出了不稳定燃烧边缘的稳定控制理论,并为台架实验所证实。 相似文献
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Jones LW 《Science (New York, N.Y.)》1971,174(4007):367-370
The use of liquid hydrogen as a long-term replacement for hydrocarbon fuel for land and air transportation seems technically feasible. It is an ideal fuel from the standpoint of a completely cyclic system, serving as a "working substance" in a closed chemical and thermodynamic cycle. The energy-per-unit-weight advantage (a factor of 3) over gasoline or any other hydrocarbon fuel makes liquid hydrogen particularly advantageous for air craft and long-range land transport. As a pollution-free fuel, it must be seriously considered as the logical replacement for hydrocarbons in the 21st century. 相似文献
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管道内涂层经济可行性分析 总被引：3，自引：0，他引：3
结合石家庄民航机场供油工程的实际设计和运营情况，对管道内涂层技术的效果及优点进行了分析和总结。针对不同管径和不同输送介质的管道，对比了内涂层与不同粗糙度的管道压降的计算值，通过在动力消耗、投资方面的经济效果分析，指出内涂层管道在实际工程中是经济可行的。 相似文献
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Wigg EE 《Science (New York, N.Y.)》1974,186(4166):785-790
The tests conducted with the three vehicles at different emission control levels suggest that, in the area of fuel economy and emissions, potential benefits with methanol blends are related to carburetion and are only significant in the case of the rich-operating cars built before emission control standards were imposed. Theoretical considerations related to methanol's leaning effect on carburetion support this conclusion. Potential advantages for methanol in these areas are therefore continuously diminishing as the older cars leave the roads. At present, these older cars use only about one-fourth of the totalc motor gasoline consumed and, before methanol could be used on a large scale, this fraction would be much smaller. The use of methanol in gasoline would almost certainly create severe product quality problems. Water contamination could lead to phase separation in the distribution system and possibly in the car tank as well, and this would require additional investment in fuel handling and blending equipment. Excess fuel volatility in hot weather may also have adverse effects on car performance if the methanol blends include typical concentrations of butanes and pentanes. Removal of these light hydrocarbon components would detract from methanol's role as a gasoline extender and if current fuel volatility specifications were maintained, its use could lead to a net loss in the total available energy for use in motor fuels. Car performance problems associated with excessively lean operation would also be expected in the case of a significant proportion of late-model cars which are adjusted to operate on lean fuel-air mixtures. If methanol does become available in large quantities, these factors suggest that it would be more practical to use it for purposes other than those related to the extending of motor gasoline, such as for gas turbines used for electric power generation. In this case, the "pure" methanol would act as a cleanburning fuel, having none of the potentially severe product quality problems associated with its use in motor gasoline, while the fuel oil or natural gas cLirrently burned in these tuLrbines CotLild be diverted to other ulses. 相似文献
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介绍一种在发动机的进气道按一定比例掺混入碱性空气介质参与发动机缸内燃烧,通过碱性空气介质对燃料的催化助燃作用来改善农用运输车辆性能的技术。 相似文献
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Ethanol produced from cellulosic biomass is examined as a large-scale transportation fuel. Desirable features include ethanol's fuel properties as well as benefits with respect to urban air quality, global climate change, balance of trade, and energy security. Energy balance, feedstock supply, and environmental impact considerations are not seen as significant barriers to the widespread use of fuel ethanol derived from cellulosic biomass. Conversion economics is the key obstacle to be overcome. In light of past progress and future prospects for research-driven improvements, a cost-competitive process appears possible in a decade. 相似文献
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车用汽油机稳态工况下废气排放与汽油机转速、负荷、空燃比和点火正时等影响因素之间是非线性关系 ,通过对汽油机试验排放数据的学习 ,建立起描述车用汽油机废气 HC,CO,NOx 排放与上述因素之间关系的 BP神经网络模型 ,该模型可用于排放预测和实时控制 相似文献
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X195柴油机掺水燃烧的试验研究 总被引：2，自引：0，他引：2
结合195柴油机的结构特点,在不改变原机任何结构的前提下,增设一套供水系统,发动机工作时,喷水器适时向气缸内喷射一定量的水,喷入气缸的水微粒在高温高压的条件下产生“微爆”效应,使柴油颗粒进一步雾化和高度分散,与空气混合更加均匀,促使燃料完全燃烧,以达到节油,降污的目的。试验结果表明,增设的供水系统工作性能的可靠,掺水燃烧时比油耗及排烟度等明显下降。 相似文献
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叶继明 《南京农业大学学报》1995,18(1):94-100
以Ｃ５（碳－５）为代用燃料，与７０号汽油制成混合燃料，在汽油发电机组上进行了试用。试验结果表明：代用混合燃料能够代替汽油机中燃烧。在标定工况下，燃用Ｃ５占混合燃料质量配比为３２．４％与１００％的混合燃料，比燃用７０号汽油耗油率分别下降８．６％和９．６％。 相似文献
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针对高原地区空气含氧量低,发动机功率不足,以及有限的石油和空气污染严重等问题。结合柴油机的结构特点、醇类燃料的特性,在不改变原机结构的前提下,增设一套醇类燃料（甲醇或乙醇）供给装置,醇类燃料供给装置供给的醇类靠排气温度加热气化并同进气流一同流入气缸。醇类燃料供给装置与原供油装置相互配合,实现辅助燃料（轻柴油）引燃,主要燃料为甲醇或乙醇,从而在达到不降低发动机功率的状况下,醇类燃料替代柴油,并且有效降低排放的目的。试验表明：此方法简单可行,除在单缸柴油机上采用外,可向多缸机推广应用,这对解决能源紧缺,降低排放,实现可持续发展,有较强的现实意义。同时对改善高原地区发动机动力性,有着其特殊的作用。 相似文献