共查询到17条相似文献,搜索用时 281 毫秒
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本文采用计算流体力学软件STAR-CCM+对某新开发汽车除霜风道进行数值模拟。通过稳态计算来预测汽车的除霜性能,对除霜效果进行了探讨,并进行了试验。对比模拟结果和试验结果总体比较接近,验证了CFD模拟的的可靠性,为汽车挡风玻璃除霜效果模拟工程提供了参考。 相似文献
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汽车除霜系统性能CFD分析与试验 总被引:1,自引:0,他引:1
依据CAD数据和其他分析所需数据,进行了3个阶段的CFD除霜性能分析,除霜风道分析、稳态流场分析和瞬态除霜分析.依据布置和接口来设计风道,掌控各个出风口的流量分配.通过稳态计算来预测汽车空调的除霜性能并进行了验算.用瞬态模拟获得前挡风玻璃上随时间变化的除霜效果表明,除霜面积和形状与试验结果相符,试验除霜速度稍快于CFD... 相似文献
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在按照《GB 11555-2009汽车风窗玻璃除霜和除雾系统的性能和试验方法》[1]进行除霜试验时,发现:在使用高压空气喷枪喷雾的方式造霜时,水以雾状被快速地喷射到前挡风玻璃表面,此时高速的水雾碰到前挡风玻璃后,会有部分水雾因反弹落在玻璃之外。其中水雾的主要的流失部位是玻璃的边缘处,这种现象会造成实际落在前挡风玻璃上的水量比计算值要少。鉴于以上现象,本试验使用塑料挡板,将反弹到玻璃边沿的水汽进行阻挡,使其二次反弹,这样可以有效地增加水雾着落在前挡风玻璃表面的概率,进而减小水量的流失。在此基础上做一组未加塑料挡板的试验,与其试验结果进行对比,分析试验结果发现:两次除霜时间—除霜痕迹曲线几乎重合,说明因未加挡板而流失的水量对试验结果影响非常小,可以忽略。 相似文献
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目前纯电动汽车的热源由动力电池提供,热能消耗将直接影响纯电动车的续驶里程.为了提升汽车的续驶里程,采用Fluent软件模拟计算与实车环境模拟风洞验证试验相结合的方法,对除霜典型加热工况等进行研究.在FMVSS103除霜工况下,采用液侧电加热器,加热期间总电能消耗接近1.736 kW·h,而电热前挡风玻璃总电能消耗接近0.156 kW·h,几乎只是液侧加热能量消耗的9%.整车及空调系统能量分配计算结果显示,采用电热前挡风玻璃加热可大幅减少电能消耗,提高汽车续驶里程. 相似文献
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J. Xu Y. B. Li X. Chen D. Y. Ge B. H. Liu M. Y. Zhu T. H. Park 《International Journal of Automotive Technology》2011,12(5):687-695
During accident, the interlayer of windshield plays an important role in the crash safety of automotive and protection of
pedestrian or passenger. The understanding of its energy absorption capability is of fundamental importance. Conventional
interlayer material of automotive windshield is made by Polyvinyl butyral (PVB). Recently, a new candidate of high-performance
nanoporous energy absorption system (NEAS) has been suggested as a candidate for crashworthiness. For the model problem of
pedestrian head impact with windshield, we compare the energy absorption capabilities of PVB and NEAS interlayers, in terms
of the contact force, acceleration, velocity, head injury criteria, and energy absorption ratio, among which results obtained
from PVB interlayers are validated by literature references. The impact speed is obtained from virtual test field in PC-CRASH,
and the impact simulations are carried out using explicit finite element simulations. Both the accident speed and interlayer
thickness are varied to explore their effects. The explicit relationships established among the energy absorption capabilities,
impact speed, and interlayer material/thickness, are useful for safety evaluation as well as automotive design. It is shown
that the NEAS interlayer may absorb more energy than PVB interlayer and it may be a competitive candidate for windshield interlayer. 相似文献
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S. J. Kang M. F. Kader Y. D. Jun K. B. Lee 《International Journal of Automotive Technology》2011,12(1):39-44
Adequate visibility through the automobile windshield is of paramount practical significance, most often at very low temperatures
when ice tends to form on the windshield screen. But the numerical simulation of the defrost process is a challenging task
because phase change is involved. In this study numerical solution was computed by a finite volume computational fluid dynamics
(CFD) program and experimental investigations were performed to validate the numerical results. It was found that the airflow
produced by the defrost nozzle is highly nonuniform in nature and does not cover the whole windshield area. The nonuniformity
also severely affected the heating temperature pattern on the windshield. The windshield temperature reached a maximum in
the vicinity of the defroster nozzle in the lower part of the windshield and ranged from 9∼31°C over a period of 30 min, which
caused the frost to melt on the windshield. The melting time was under 10 minutes, which satisfied the NHTSA standard. The
numerical predictions were in close agreement with the experimental results. Thus, CFD can be a very useful design tool for
an automobile HVAC system. 相似文献
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现在汽车上常用的玻璃分为两种:夹层玻璃和钢化玻璃。前风挡玻璃主要是夹层玻璃,后挡和侧门玻璃多为钢化玻璃。尤其是前风挡玻璃,和乘员接触最近,保护作用作也最大,它与乘员安全息息相关,所以玻璃的生产前期试验验证就显得尤为重要。文章主要分析了汽车前风窗玻璃的结构,通过对比ISO,欧洲经济委员会(ECE),中国国家标准(GB),上海汽车(SAIC),双龙汽车(Ssangyong),名爵汽车(MG),菲亚特汽车(FAIT)等试验标准,研究了前风窗玻璃的试验机理和试验方法,给出了相关的试验步骤和试验限值,对玻璃的质量控制有重大意义。 相似文献