摘要
傅里叶非圆齿轮驱动的差速泵在负载工况下有明显的周期性冲击现象,而在空载状态不存在。为提升差速泵运行平稳性,开展数值计算和试验研究,首先建立差速泵数值计算模型,利用数值计算方法对差速泵流场和驱动非圆齿轮进行流固耦合计算。计算结果表明,差速泵在吸、排液工况交替瞬间,叶轮存在转矩突变现象,主要原因是叶轮旋转对进、出口关闭或打开瞬间形成了水锤效应。为此,对差速泵叶轮边缘进行微圆角优化处理以形成流场过渡区。仿真结果显示,叶轮优化后的输入轴周期性转矩突变峰值至少可降低21. 58%,且吸、排液腔压力分布更为均匀。经试验验证,转矩变化趋势及转矩突变点基本吻合,2个叶轮优化后转矩最大变化幅度平均降低51. 20%。结果表明,差速泵叶轮边缘对转矩特性影响较大,叶轮边缘优化对减弱水锤效应及改善叶轮转矩特性非常有效。
The differential pump driven by Fourier non-circular gears has obvious periodic impact phenomenon under load condition,but it does not exist under no-load condition. In order to reduce the impact under load conditions and improve the stability of differential pump,a numerical calculation model of differential pump was established,and the fluid-solid coupling calculation of flow field and driving noncircular gear of differential pump was carried out by numerical calculation method. The calculation results showed that there was a sudden change in the impeller's torque at the instant of alternating suction and discharge conditions of differential pump. The main reason was the water hammer effect formed when the blade rotated to the inlet and outlet and closed or opened. In order to reduce the impact,micro-rounded edges of differential pump blades were processed to form a flow field transition zone. The simulation results showed that the periodic torque mutation of the input shaft of the optimized blades was reduced by at least 21. 58%,and the pressure distribution of the suction and drainage chambers was more uniform.By verification,it was confirmed that the edge of the differential pump blade had a great influence on the torque characteristics. The maximum variation of the two impellers' torque was decreased by 51. 20% on average. And the optimization of the edge roundness had a great effect on reducing the water hammer effect and improving the impeller torque characteristics.
引文
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