共查询到20条相似文献,搜索用时 218 毫秒
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针对液力变矩器叶片建模周期长及叶形交错性强等特点,采用非均匀有理B样条(NURBS)对叶片的关键截面和叶形进行参数化表达,并通过叶片设计原则和三维建模软件CATIA建立一款扁平化液力变矩器及相应单流道模型,然后利用CFD对其稳态内流场进行数值仿真,并与试验外特性进行对比,同时通过分析速度场和压力场,揭示了流道内的主流特征,分析造成液力损失的成因。结果表明,NURBS及CFD在液力变矩器设计方面的重要作用,同时为液力变矩器的设计、优化提供了依据。 相似文献
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《机械设计》2018,(10)
为缩短液力变矩器的设计周期,节省试制与试验成本,文中基于液力变矩器的基本原理和流场理论,用欧拉方程和伯努利方程对叶片内流场进行了理论分析,并借助三维流场仿真软件Ansys-CFX对某车用液力变矩器进行了性能计算。得出了不同速比下的效率、变矩比和公称力矩;为了验证该仿真计算的正确性,搭建了液力变矩器综合试验台,并进行了产品性能试验。结果表明:试验测得变矩比、效率值均略小于仿真值,其平均相对误差分别为3.1%和3.25%,而公称力矩稍大于仿真值。由此可见,基于三维流场的ANSYS-CFX仿真方法较全面地反映了液力变矩器内部真实的流场,为液力变矩器的设计提供了可靠的依据。 相似文献
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以液力变矩器稳态内流场问题为对象,对处理多旋转区域耦合问题的两种典型方法,即多参考坐标系(MRF)模型和混合面模型进行理论研究,并对比采用两种模型后的仿真结果,流场分析的结果表明采用MRF模型时预测的液力变矩器性能与试验吻合的较好,残差收敛效果好;而且,MRF模型在交界面上的模拟比混合面模型更接近实际流场。因此,采用MRF模型是进行液力变矩器内流场分析的有效方法。 相似文献
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为了解决液力变矩器在整机复杂工况下的性能评价问题,提出了一种基于整机载荷特征的液力变矩器评价方法,即建立整机的数字化模型,以传动链效率提升作为目标来评价不同载荷工况下液力变矩器的性能.对比液力变矩器的模型解析结果和台架试验数据,验证了变矩器系统子模型的准确性.选取2种性能相近的变矩器作为评价对象,通过整机系统计算得到它们在典型工况下的输出情况和评价指标,仿真结果表明液力变矩器和整机合理匹配可以有效提高整机效率,对液力变矩器改型和设计有实际意义. 相似文献
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SHANG Tao ZHAO Dingxuan ZHANG Yuankun GUO Xiangen SHI Xiangzhong 《Frontiers of Mechanical Engineering》2008,3(1):86
To enhance the performance of a hydrodynamic torque converter and thoroughly understand the trait of inside flow, a numerical simulation method of internal 3D flow for the three-element centrifugal hydrodynamic torque converter was systematically researched and expatiated in this paper. First, the internal flow field of each impeller was calculated. The curves that illustrate the relationships between the pressure differences of the inlet and outlet versus flux were drawn. Second, the concurrent working point of each impeller was approximately estimated. Finally, a calculation was performed considering the influence on each impeller. The flow field of a working point was solved by multiple calculations and the actual working condition was gradually determined. The pressure and velocity distributions of the flow field were proposed. The performance parameters of the hydrodynamic torque converter were predicted. The calculation method, and the proposed pressure and velocity distribution of the flow field, have practical significance for the design and improvement of a hydrodynamic torque converter. 相似文献
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Tao SHANG Dingxuan ZHAO Yuankun ZHANG Xiangen GUO Xiangzhong SHI 《Frontiers of Mechanical Engineering in China》2008,3(1):86-90
To enhance the performance of a hydrodynamic torque converter and thoroughly understand the trait of inside flow, a numerical
simulation method of internal 3D flow for the three-element centrifugal hydrodynamic torque converter was systematically researched
and expatiated in this paper. First, the internal flow field of each impeller was calculated. The curves that illustrate the
relationships between the pressure differences of the inlet and outlet versus flux were drawn. Second, the concurrent working
point of each impeller was approximately estimated. Finally, a calculation was performed considering the influence on each
impeller. The flow field of a working point was solved by multiple calculations and the actual working condition was gradually
determined. The pressure and velocity distributions of the flow field were proposed. The performance parameters of the hydrodynamic
torque converter were predicted. The calculation method, and the proposed pressure and velocity distribution of the flow field,
have practical significance for the design and improvement of a hydrodynamic torque converter.
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Translated from Journal of Jilin University (Engineering and Technology Edition), 2006, 36(2): 199–203[译自: 吉林大学学报(工学版)] 相似文献
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工程机械液力变矩器现代设计方法及应用 总被引:1,自引:0,他引:1
为适应液力变矩器发展需要,突破传统设计方法的局限性,提高产品研发速率、降低开发成本、提高产品综合性能。在国内率先提出基于三维流动理论的液力变矩器现代设计方法,将计算流体力学CFD技术与激光可视流场分析技术进行无缝结合,突破可视化流场分析、叶片成形及三维瞬态流场计算等关键技术,解决了变矩器内部液体流动不可视、叶形空间复杂曲面成形等难题,创建了包括预设计、叶型设计、性能分析、参数调整、内流场测试、模具设计及样机制造环节等六个环节的设计方法体系。液力变矩器现代设计方法不但保证产品性能的最优化,同时提高了设计到产品的一次成功率,有效缩短了开发时间、降低开发成本,是对传统设计方法的重大突破。 相似文献
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针对车用液力变矩器复杂动态过程中工作相位随时发生转换,不能及时判断相应流场结构的改变,难以对瞬时流场特性进行准确仿真的问题,基于传统变矩器CFD流道模型和导轮空转无叶片模型,建立了液力变矩器混合流道CFD仿真模型。该仿真模型可以自动识别变矩器变矩、偶合和功率反传等工作相位及其相位转换过程,并根据导轮是否空转自动选择相应流道模型。对某变矩器进行了一系列稳态通用特性和动态特性的仿真与试验研究,对比结果表明,液力变矩器混合流道CFD仿真方法对变矩器稳态和动态特性仿真精度较高,有效解决了变矩器复杂动态过程难以快速实时仿真的问题,具有一定的工程实际意义。 相似文献
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