共查询到17条相似文献,搜索用时 234 毫秒
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涡轮增压器的三大特性涡轮增压器普遍采用全浮动轴承由于涡轮增压器转子转速高达4500转/分钟以上,常见的机械滚针或滚珠轴承将无法工作,因此,涡轮增压器普遍采用全浮动轴承。 相似文献
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乘用车废气旁通式涡轮增压器匹配技术 总被引:1,自引:0,他引:1
文章旨在解决使用传统方法进行匹配乘用车废气旁通式涡轮增压器涡轮匹配过程存在的不足。使用传统定压增压系统的涡轮增压器匹配方法,即将算术平均值作为计算边界,不适用于乘用车发动机增压器的匹配,特别是小排量(<1.6L)3缸发动机,低速脉冲能量大,匹配结果与实际试验结论相差较大。文章引用脉冲修正系数对涡轮等熵效率进行修正,从而使匹配结果与实际试验结果相接近,实现更准确的匹配工作。 相似文献
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涡轮增压器一般安装在近发动机排气侧,由高温高压的发动机废气来推动,所以增压器的工作温度很高,往往会达到900℃左右。涡轮增压器在工作时涡轮转子的转速可达到10~20万r/min,如此高的转速和温度无法使用常见的滚针或滚珠轴承保证涡轮转轴正常工作,因此涡轮转轴普遍采用全浮动轴承,并由高等级机油来进行润滑。 相似文献
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增压器涡轮叶片振动分析及其可靠性评价方法研究 总被引:1,自引:0,他引:1
针对增压器涡轮叶片振动失效模式,研究了涡轮叶片振动分析与可靠性评价方法。结合某增压器涡轮,利用共振线图建立了涡轮叶片振动失效判据。考虑涡轮叶片振动固有频率分散性与涡轮工作转速随机性的影响,建立了能够体现叶片振动固有频率、工作转速、叶片数、寿命指标、最小谐振阶数等参数的涡轮叶片振动可靠度与失效率计算模型,研究了涡轮叶片振动可靠度与失效率的变化规律,给出了涡轮叶片振动可靠寿命确定方法。运用所建立的方法及模型,能够科学地计算出增压器涡轮叶片振动的可靠度与失效率变化规律以及可靠寿命。 相似文献
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弹性环阻尼器对涡轮增压器转子动力性能影响研究 总被引:2,自引:0,他引:2
以高速涡轮增压器滚珠轴承转子系统弹性环阻尼器(ERSFD)为研究对象,采用有限元分析以及挤压油膜理论对弹性环支承刚度、油膜压力场分布、油膜刚度阻尼以及滚珠轴承转子系统动力学特性等进行了分析研究,并与挤压油膜阻尼器(S F D)进行对比分析.研究发现,弹性环阻尼器的交叉刚度和阻尼很小,有效地改善了挤压油膜阻尼器刚度阻尼自由度耦合问题,刚度阻尼的非线性得到明显的抑制.采用六凸台弹性环阻尼器与滚珠轴承串联组合的增压器进行了台架试验,并与动力学计算结果进行了对比分析. 相似文献
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Turbocharging port-injected Natural Gas (NG) engines allows them to recover gaseous-fuel related power gap with respect to
gasoline engines. However, turbolag reduction is necessary to achieve high performance during engine transient operations
and to improve vehicle fun-to-drive characteristics. Significant support for the study of turbocharged Compressed Natural
Gas (CNG) engines and guidelines for the turbo-matching process can be provided by 1-D numerical simulation tools. However,
1-D models are predictive only when a careful tuning procedure is set-up and carried out on the basis of the experimental
data. In this paper, a 1-D model of a Heavy-Duty (HD) turbocharged CNG engine was set up in the GT-POWER (Gamma Technologies
Inc., Westmont, IL, US) environment to simulate transient operations and to evaluate the turbolag. An extensive experimental
activity was carried out to provide experimental data for model tuning. The model buildup and tuning processes are described
in detail with specific reference to the turbocharger model, whose correct calibration is a key factor in accounting for the
effects of turbine flow pulsations. The second part of the paper focuses on the evaluation of different strategies for turbolag
reduction, namely, exhaust valve variable actuation and spark timing control. Such strategies were aimed at increasing the
engine exhaust-gas power transferred to the turbine, thus reducing the time required to accelerate the turbocharger group.
The effects of these strategies were examined for tip-in maneuvers at a fixed engine speed. Depending on the engine speed
and the applied turbolag reduction strategy, turbolag reductions from 70% to 10% were achieved. 相似文献