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泵轮进口半径设计一直依赖于经验,缺乏理论依据.为从理论上确定泵轮进口半径,突破传统的经验设计方法,基于减少涡流引起的能量损失,提出了一种理论计算方法——轴面驱动力平衡法.根据泵轮内部不产生旋转涡流的特点,建立了驱动力合力方程,推导了进口边极角计算公式,编制了Fortran程序,并进行了逼近误差分析.结果表明,进口边极角的计算值和已有文献中的经验数据比较吻合,说明该方法是可行的.该方法的提出将泵轮进口半径的设计由经验方法上升到理论方法,为进一步理论研究提供一定的基础. 相似文献
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The influence of streamline bending inertia force on power loss is investigated. In order to analyze the combined effect of the inertia force and the path on the power loss, the accumulation effect expression of the inertia force on its path is derived. The calculation result shows that the accumulation effect of the unit inertia force on its path depends merely upon the velocity magnitude and the path scroll angle. As long as they are given, the accumulation effect is a constant and independent of the intermediate path. An important conclusion drawn is that the maximum inertia force rather than its accumulation effect plays a predominant role in the power loss. Thus, a new design method, minimum streamline curvature method, is proposed. Fluid particle movement inside a hydrodynamic torque converter can be regarded as curved movement on the circular surface and decomposed into a meridional component and a circumferential component. Each meridional streamline is designed to be close to a circular arc, while each torus streamline is constructed with a circular arc and a straight line segment. Based on the meridional streamline equation, the torus streamline equation and a streamlined thickness function, a blade surface equation of three-element centripetal-turbine hydrodynamic torque converter can be obtained. 相似文献
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在齿轮齿条式自动脱挂梁设计中,建立了计算模型,编制了计算程序,利用计算机进行了运动分析和动力分析,保证了设计精度,提高了脱挂梁的性能。 相似文献
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基于AMESim的工程车辆液压悬架系统仿真 总被引:2,自引:0,他引:2
为研究液压悬架系统中各主要参数对控制车体垂直位移的影响,在建立的单轮1/4车液压悬架数学模型基础上,运用AMESim软件进行了1/4车液压悬架建模与仿真分析.通过仿真,将液压缸和伺服阀不同规格参数对液压悬架在阶跃激励下车体垂直位移的影响结果进行了比较,结果表明,AMESim在液压悬架系统仿真中的有效性为整车液压悬架仿真研究提供了参考. 相似文献
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生物化学实验教学改革策略 总被引:1,自引:0,他引:1
本文针对当前生物化学实验教学中存在的几个问题,结合授课感受,提出从改革实验内容,改进教学方法和改革考核方式等方面着手进行改革的策略。部分内容已付诸教学实践,效果良好。 相似文献