共查询到17条相似文献,搜索用时 234 毫秒
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电传动装甲车动カ舱内空气波场数值模拟及结构改进分析 总被引:1,自引:0,他引:1
将装甲车由机械传动改为电传动后,电机类设备的增加对动力舱内的冷却系统提出新的要求,利用计算流体动力学(CFD)技术对虚拟动力舱内空气流场进行数值模拟,可以对动力舱冷却系统的合理性进行预测分析并提出建议。以某虚拟电传动装甲车动力舱为研究对象,建立了电传动装甲车动力舱内空气流动与传热计算的物理模型和数学模型,采用标准尾K-ε方程湍流模型对舱内的流动进行了描述,对不同风扇流量下动力舱内空气流场进行了三维数值模拟与分析,为风扇流量的确定提供了理论依据;对动力舱排气窗位置进行了分析讨论,指出排气窗位置的不同会对舱内部件带来不同的冷却效果。 相似文献
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为提高冷却风扇蜗壳的综合性能,建立包含U型蜗壳半圆段半径R、蜗壳高度H、蜗壳半圆段圆心与叶轮中心的偏差(X、Y)、叶轮底面与蜗壳内壁的距离ZP等参数的蜗壳参数化计算流体力学模型。对初始模型进行了验证。建立蜗壳的综合评价模型,利用熵权法计算了综合评价函数中蜗壳体积、风扇功耗和1/风量等指标的权重。以综合评价函数为目标函数,采用响应面法对蜗壳进行了优化。研究结果表明:蜗壳半圆段半径R和蜗壳高度H是蜗壳综合评价函数的主要影响因素;随着R和H的增大,综合评价函数先减小、后增大;经过优化后,蜗壳综合评价函数值减小了23.43%,性能显著改善,证明该方法能够应用于冷却风扇蜗壳的优化设计。 相似文献
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基于多种群协同进化免疫多目标优化算法的百叶窗优化研究 总被引:1,自引:0,他引:1
为降低空气流通阻力、增加空气流量以及获得最大的防护能力,对装甲车辆进气和排气百叶窗结构优化进行研究。建立装甲车辆进气和排气百叶窗数值计算模型,根据冷却系统工作特点搭建冷却风道半实物仿真模型,对比分析优化前的仿真结果和台架测试结果,并给出了优化目标函数表达式。为解决优化效率低、计算量大的问题,确定设计变量并建立设计变量与目标函数之间关系的椭圆基神经网络替代模型。通过分析目标函数随设计变量的变化规律,采用基于多种群协同进化免疫的多目标优化算法对模型进行优化,确定了最终解。利用自组织神经网络对样本点进行数据挖掘,找到了内在规律。研究结果表明,优化后的进气和排气百叶窗在提高防护能力的同时,提高了散热性能。 相似文献
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本文针对径流透平矩形截面蜗壳中的三维不可压无粘流,建立了一个新型曲线坐标系,对运动控制方程和边界条件进行有限差分模拟,求解带有Neumann边界条件的Poisson微分方程的解,获得蜗壳中的速度势场,从而算出蜗壳中三维速度场的分布. 相似文献
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When the mechanical drive is changed into the electric transmission,the cooling system of the engine compartment should be altered to meet the new requirement for the increasing in equipment such as electric apparatus.In order to predict and analyze the rationality of cooling system in the virtual engine compartment,the numerical simulation of airflow fields in the engine compartment by using computational fluid dynamics(CFD) technique is necessary.An armored vehicle with electric transmission in the research is taken as the research object.The physical model and mathematical model for the computation of 3D air flow and heat transfer in the engine compartment of an armored vehicle with electric transmission is established.Turbulent flow in the compartment is described by using the standard k-ε two-equation turbulence model.The temperature and velocity fields of 3D air flow in the engine compartment are numerically simulated and analyzed based on different fan's flux.A theoretical basis for determination of the fan's flux is given by the simulation results.The positions of the air-vent shutter are analyzed.The simulation results show that the different positions of the air-vent shutter can lead to different cooling efficiencies. 相似文献
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when a gun fires, a large amount of heat is brought in the barrel. Erosion/wear and security problems(self ignition of the propellant) associated with this high thermal energy have to be solved owing to the use of higher combustion gas temperature for improved cannon performance and firing at the sustained high rates, Barrel cooling technologies are the effective measures for addressing this issue, In view of the importance of having knowledge of the heat flux, an approach to calculate heat flux based on measurements was presented and validated. The calculated heat flux is used as the inner boundary condition for modeling heat transfer in a 155 mm mid-wall cooled compound gun barrel, Theoretical analysis and simulated results show that natural air cooling is dramatically slower than the forced liquid mid-wall cooling, accordingly wear life of actively cooled barrel is increased and barrel overheating is prevented, 相似文献
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为进行有源导弹逼近告警系统探测距离的考核,采用空空航模飞机模拟导弹飞行和地空导弹高速远离飞行相结合的方法对其进行研究。介绍机载有源导弹逼近告警系统的工作特点和国外对其所采用的试验方法,详细分析利用空空航模飞机和地空导弹远离飞行来进行有源导弹逼近告警设备探测距离考核的试飞方法。结果表明:该方法保障条件简单、易于实施和试飞经费消耗少,可为今后军机装备的有源导弹逼近告警系统的试飞打下基础。 相似文献