以下为句子列表：
英文: To estimate the influence of the flatness ratio on hydrodynamic performance, a group of torque converters with different widths were investigated by CFD simulation to improve the power diversity and reduce the mass based on the variable-width circulatory
中文: 摘要在变宽度循环圆设计方法的基础上，为提高液力传动系统功率密度，减轻质量，对几组不同宽度比循环圆的变矩器进行了CFD（计算流体动力学）数值模拟，借以评估对其整体传动性能的影响。
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