共查询到18条相似文献,搜索用时 187 毫秒
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利用整车热管理仿真软件KULI,建立了某重型商用车发动机冷却系统一维仿真模型,以冷却系统主要部件的物理参数和性能参数作为边界条件,进行标定工况的计算分析并与试验进行对比,验证了仿真的准确性,对冷却系统部分参数进行匹配,分析了影响该发动机冷却系统的各个因素. 相似文献
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通过一维/三维耦合仿真方法进行装载机热管理仿真计算,建立装载机整车三维模型,利用Fluent商业软件计算发动机舱内的空气流动。计算结果表明:散热器进风不均匀,散热器上部与下部形成热风回流,整机左右两侧进风口的进风不畅和风扇周围形成多处涡流;利用三维仿真得到的散热器进口风量,在一维仿真中反推机舱阻力系数,利用KULI商业软件,计算发动机出水温度、液压油散热器进口温度、传动油散热器进口温度;通过仿真数据与试验数据的对比,验证了一维/三维耦合仿真的准确性。 相似文献
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以某重型商用车发动机冷却系统为研究对象,利用整车热管理仿真软件KULI建立了冷却系统模型,进行了发动机冷却系统的仿真计算,并与试验数值进行比对分析.结果表明:仿真结果与试验数值吻合较好,仿真模型可靠,为发动机冷却系统的设计与匹配提供理论依据,通过软件仿真可以大大提高冷却系统分析效率,节省试验费用. 相似文献
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Qinguo Zhang Liangfei Xu Jianqiu Li Minggao Ouyang 《International Journal of Hydrogen Energy》2018,43(3):1736-1748
The cooling system of proton exchange membrane fuel cell (PEMFC) engine was simulated by 1D and 3D collaborative simulation method. Firstly, the resistance characteristics of the flow channel are obtained by simulating the airside flow model. A three-dimensional simulation model including dual fans and radiator is also established to simulate the airflow distribution. The one-dimensional simulation model of 30 kW PEMFC engine cooling system that are mainly composed of a thermostat, water pump, and fan and radiator model is established. Secondly, the heat dissipation performance of the cooling system is calculated by using the coupled simulation model. It is found that the simulation results of the amount of heat transferred are in good agreement with the experimental data by compromising, which proves that the model is reasonable. Finally, the thermal performance of the extreme operating conditions of the PEMFC system is simulated by means of a simulation model. By monitoring the flow of the pump and the fan speed, we can maintain the stack internal heat balances, so that the stack efficient and stable operation. The results demonstrate that the 3D simulation can get the distribution of fluid flow more accurately, while the simulation time of 1D thermal system is short and can guide the matching of heat transfer parts quickly. 相似文献
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S.C. Pang M.A. Kalam H.H. Masjuki M.A. Hazrat 《International Journal of Heat and Mass Transfer》2012,55(23-24):6295-6306
Engine cooling system plays an important role to maintain the operating temperature of engine. The coolant circuit initiates by picking up heat at water jackets. With the pressure gradient exists in coolant circuit, hot coolant flows out from engine to radiator or to bypass circuit (during cold start). The under hood air flow carries heat away at radiator after the air flows through numerous hood components. The coolant flow circuit and air flow circuit meet each other and exchange heat at radiator. Extensive researches are carried out to study vehicles’ cooling system extensively either numerically or experimentally. The research covers many individual topics which include numerical modelling of engine cooling system, under hood air flow, heat transfer at water jacket, heat transfer at radiator and coolants’ after-boiling phenomenon. 相似文献
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陈富强 《柴油机设计与制造》2006,14(3):5-11
以满足发动机日益严格的排放法规的要求和进程为基本目标,基于发动机热平衡的结果和分析,对冷却系统的冷却器组件(水散热器,中冷器和机油冷却器)所需要的设计散热量做了调查和研究,得出了一些可用于分类比较、定量(在调查范围内)的经验统计规律和趋势。且已经尝试、成功用于指导冷却器的参数确定和研制,具有实用意义。继续跟踪发展,扩大范围、积累和更新规律,将有利于公司的冷却器产品设计生产尽快实现与现代发动机的同步和优化发展,更好的满足国内外客户要求。 相似文献
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针对卧式柴油机强制冷却闭式循环系统水套结构,试验研究了不同工况下水套入口流量及关键点的温度和压力。采用计算流体动力学(CFD)三维模拟的方法建立了冷却水流动仿真模型,并进行了试验验证。设计了冷却水套结构参数正交方案,通过CFD模拟分析了水泵出水流量、公共水腔截面形状和面积、缸体及缸盖入水孔的设置和分布等水套结构参数对冷却水流动的影响关系。研究结果表明:卧式柴油机缸体入水孔截面积和布置对缸体水套冷却水流动、冷却效果和冷却均匀性有很大的影响;卧式柴油机缸盖入水孔的位置、孔数和截面积等结构参数对缸盖水套的冷却水流动、冷却效果、冷却均匀性及进/排气侧的冷却分布等均有很大的影响。 相似文献
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工程机械柴油机动态工况冷却系统热平衡研究 总被引:2,自引:0,他引:2
从工程机械动态性能匹配理论研究出发,解决在连续高负荷、高温环境工况条件下工程机械柴油机冷却系统温度过高问题.对传统柴油机冷却系统模型进行动态化、精细化和模块化改良,提出了动态工况下的工程机械柴油机冷却系统热平衡模型.系统模型以柴油机转速随时间变化作为输入,各子系统模块均采用动态模型表征,并细化考虑了发动机舱温度对风扇进风温度的影响,以提高精度.模型能够反映转速变化对于冷却系统温度变化的动态特性,并通过与试验结果的比较,验证了该模型描述工程机械动态工况下冷却系统性能的有效性. 相似文献
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本文利用试验模态技术建立S1100柴油机主构件的动力学模型,并模拟工作状况,预测各点的动态变形。其研究结果为柴油机的故障诊断、结构的优化设计提供了可靠的科学方法。 相似文献
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Tim M. Brown Jacob Brouwer G. Scott Samuelsen Franklin H. Holcomb Joel King 《Journal of power sources》2008
A dynamic model of a discrete reversible fuel cell (RFC) system has been developed in a Matlab Simulink® environment. The model incorporates first principles dynamic component models of a proton exchange membrane (PEM) fuel cell, a PEM electrolyzer, a metal hydride hydrogen storage tank, and a cooling system radiator, as well as empirical models of balance of plant components. Dynamic simulations show unique charging and discharging control issues and highlight factors contributing to overall system efficiency. 相似文献