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不同海拔条件下喷油参数对柴油机性能的影响 总被引:1,自引:0,他引:1
通过内燃机高原环境模拟试验台,研究了不同海拔条件下高压共轨柴油机在最大转矩转速点(1500 r/min)全负荷(2300 N·m)和部分负荷(500 N·m)工况下喷油提前角、共轨压力及循环喷油量(全负荷)对柴油机燃烧特性与性能的影响规律.结果表明:全负荷工况下,随着喷油提前角增加,柴油机滞燃期增加,最高燃烧压力和最大压力升高率增大,增大趋势随海拔增加而降低,柴油机转矩在0 km和3 km海拔先增加后减小,在5 km海拔时逐步增加.随着共轨压力增加,柴油机燃烧相位提前,最高燃烧压力、最大压力升高率和转矩均增加,排温降低;部分负荷工况下,有效燃油消耗率随共轨压力增加而降低.随循环喷油量增加,转矩、排温和缸内压力均逐渐增大,最大压力升高率在3 km海拔范围内逐渐增加、在5 km海拔时逐渐减小.海拔每升高1 km,柴油机在全负荷工况下,最佳循环喷油量平均降低5.81%,最佳喷油提前角和共轨压力在全负荷和部分负荷工况下平均分别增加了1.2°,CA、0.8°,CA和4 MPa、3 MPa. 相似文献
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以柴油和柴油-小桐子掺混油在单缸水冷四冲程柴油机上进行试验,测录了多循环的瞬时气缸压力与高压油管燃油压力,对比分析了不同转速的全负荷工况与标定点转速不同负荷工况,燃用柴油与掺混油的喷油与燃烧过程及燃烧过程中各参数的循环变动.结果发现,喷油率随转速升高而升高;喷油始点随转速升高略微推迟,随负荷增大而提前;掺混油燃烧始点早于柴油,燃烧始点随转速升高延后,随负荷增大而提前,燃烧始点的循环变动量随转速升高而增大;高转速、高负荷时的最高燃烧压力循环变动率较小;掺混油的最大燃烧压力升高率低于柴油,最大压力升高率循环变动率随转速升高、负荷减小而增大. 相似文献
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在一台高压共轨增压中冷柴油机上研究了煤基混合燃料(33%煤炭提取配方,67%-35#柴油)的燃烧与排放特性。结果表明:相比于燃用-35#柴油,燃用煤基混合燃料时柴油机的燃烧滞燃期基本不变,放热率峰值增大,低转速全负荷时最大缸内燃烧压力降低,而在高转速时变化不大;燃用煤基混合燃料时PM_(2.5)排放物质量浓度降低,全负荷工况下PM_(2.5)排放物质量浓度平均降低约15.2%,部分负荷工况下,低负荷时的改善效果最为明显,平均降低约56.3%;燃用煤基混合燃料时NO_x排放物体积分数略有增大。 相似文献
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为了提高甲醇在能量转化效率方面的优势,在一台CY25TQ型柴油机上,利用F-T柴油和煤基甲醇研究了甲醇占能比、F-T柴油喷油时刻对甲醇预混合气F-T柴油引燃燃烧方式下发动机燃烧特性的影响。试验结果表明:甲醇占能比增加,此燃烧方式滞燃期、持续期波动较大。在平均有效压力为0.45MPa下,缸内最大压力、瞬时放热率峰值、最大压力升率明显降低,最大降幅分别为26.40%、59.25%和58.00%。高负荷时,不同甲醇占能比下F-T柴油喷射时刻调整,能促进压升率进一步降低。与原柴油机扩散燃烧方式相比,虽然采用引燃喷射的双燃料发动机在中低负荷时的有效热效率有所降低,但是随着负荷增加,高负荷下的热效率比原柴油机高,最大提高了17.14%。 相似文献
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针对高转速和大负荷工况下发动机粗暴燃烧、热负荷过高的问题,在一台高强化单缸柴油机上加装进气道辅助喷水系统进行仿真试验,研究了进气道喷水对燃烧与排放特性的影响。通过建立一维热力学模型和三维全气道模型,在独立进气道水喷射系统的高强化单缸柴油机上进行试验,对比不同喷水压力和水油比对缸内氧气浓度、燃烧压力、燃烧温度和NOx排放的影响。试验结果表明,喷水压力为1 MPa、水油比为0.6时,缸内最高燃烧温度降低34.2 K,NOx生成量减少24.6%。进气道喷水可明显降低缸内燃烧温度,在优化排放的同时有效改善了高强化柴油机热负荷过高的问题。 相似文献
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欧盟2013年发布的法规对L类车辆V型试验测试工况循环做出了新的规定,包括AMA循环和SRC-LeCV循环。详细地介绍了SRC-LeCV循环,并对车辆在AMA和SRC-LeCV两种不同循环下的实际行驶状态进行对比研究,对开展摩托车排放耐久检测与试验研究具有重要参考意义。 相似文献
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This study investigated the cycle optimization of four-bed, silica gel–water adsorption with reheat cycle, where the desorber (upper bed) and adsorber (lower bed) always interact with the condenser and evaporator, to exploit a low heat-source temperature. In a previous study, the performance of a reheat cycle with chilled water outlet temperature fixed at 9°C was observed without considering the cycle optimization. Maintaining a constant chilled water outlet temperature is also of equal importance to improve the conversion efficiency so that maximum cooling capacity can be derived. In this paper, a simulation model of reheat adsorption cycles is developed to analyze the optimization of the cycle time, including adsorption/desorption time, mass recovery time, and preheating/precooling time, with chilled water outlet temperature fixed. The reheat working principle is also introduced. The proposed cycle is compared with the four-bed versison without reheat cycle in terms of coefficient of performance (COP) and cooling capacity. The result shows that the performance of a reheat cycle is superior to that of four-bed version without reheat, especially for low heat-source temperature. For low heat-source temperature (55–65°C) both COP and cooling capacity of the reheat cycle with optimization were raised significantly compared to the high heat-source temperature (70–80°C). 相似文献
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环保高效的整体煤气化燃气-蒸汽联合循环 总被引:5,自引:0,他引:5
对整体煤气化燃气-蒸汽联合循环(Integrated Gasification Combined Cycle简称IGCC)的技术、环保和节能的特点以及当前面临的问题进行论述.同时对IGCC相关新技术、新概念、新循环的研究及发展前景进行展望. 相似文献
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Sanjay 《国际能源研究杂志》2013,37(8):899-912
The paper deals with thermodynamic analysis of cooled gas turbine‐based gas‐steam combined cycle with single, dual, or triple pressure bottoming cycle configuration. The cooled gas turbine analyzed here uses air as blade coolant. Component‐wise non‐dimensionalized exergy destruction of the bottoming cycle has been quantified with the objective to identify the major sources of exergy destruction. The mass of steam generated in different configurations of heat recovery steam generator (HRSG) depends upon the number of steam pressure drums, desired pressure level, and steam temperature. For the selected set of operating parameters, maximum steam has been observed to be generated in the case of triple pressure HRSG = 19 kg/kg and minimum in single pressure HRSG = 17.25 kg/kg. Plant‐efficiency and plant‐specific works are both highest for triple‐pressure bottoming cycle combined cycle. Non‐dimensionalized exergy destruction in HRSG is least at 0.9% for B3P, whereas 1.23% for B2P, and highest at 3.2% for B1P illustrating that process irreversibility is least in the case of B3P and highest in B1P. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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