The performance of a newly designed tri-lobe industrial lobe pump of high capacity is simulated by using commercial CFD solver Ansys Fluent. A combination of user-defined-functions and meshing strategies is employed t...The performance of a newly designed tri-lobe industrial lobe pump of high capacity is simulated by using commercial CFD solver Ansys Fluent. A combination of user-defined-functions and meshing strategies is employed to capture the rotation of the lobes. The numerical model is validated by comparing the simulated results with the literature values. The processes of suction, displacement, compression and exhaust are accurately captured in the transient simulation. The fluid pressure value remains in the range of inlet pressure value till the processes of suction and displacement are over. The instantaneous process of compression is accurately captured in the simulation. The movement of a particular working chamber is traced along the gradual degree of lobe’s rotation. At five different degrees of lobe’s rotation, pressure contour plots are reported which clearly shows the pressure values inside the working chamber. Each pressure value inside the working chamber conforms to the particular process in which the working chamber is operating. Finally, the power requirement at the shaft of rotation is estimated from the simulated values. The estimated value of power requirement is 3.61 BHP FHP whereas the same calculated theoretically is 3 BHP FHP. The discrepancy is attributed to the assumption of symmetry of blower along the thickness.展开更多
In this paper, a time-dependant calculation of flow in a lobe pump is presented. Calculations are performed using the arbitrary Lagrangean Eulerean (ALE) method. A grid manipulator is needed to move the nodes between ...In this paper, a time-dependant calculation of flow in a lobe pump is presented. Calculations are performed using the arbitrary Lagrangean Eulerean (ALE) method. A grid manipulator is needed to move the nodes between time steps. The used grid manipulator is based on the pseudo-force idea. This means that each node is fictitiously cormeeted with its 8 neighbours via fictitious springs. The equilibrium of the resulting pseudo spring forces defines the altered position of the nodes. The grid manipulator was coupled with a commercial flow solver and the whole was tested on the flow through a three-lobe lobe pump. Results were obtained for a rotational speed of 460 rpm and incompressible silicon oil as fluid.展开更多
为了提高凸轮泵转子的设计效率和精度,对凸轮泵转子的型线参数进行了理论分析,建立了各参数之间的参数化方程,在此基础上,基于SolidWorks平台,采用C#编程语言,在Visual Studio 2017环境下开发了凸轮泵转子型线参数化设计软件。该软件主...为了提高凸轮泵转子的设计效率和精度,对凸轮泵转子的型线参数进行了理论分析,建立了各参数之间的参数化方程,在此基础上,基于SolidWorks平台,采用C#编程语言,在Visual Studio 2017环境下开发了凸轮泵转子型线参数化设计软件。该软件主界面集输入、计算、输出按钮于一体,输入具体工况参数即可进行转子参数计算和设计,软件还提供多叶、直叶、螺旋等转子类型的选择,缩短了计算周期,提高了设计效率。通过数值模拟计算和试验验证,对比了不同压差及不同转速下的流量曲线,软件的设计结果与数值计算和试验结果误差分别在5%和3.0%以内,验证了该软件的设计结果精确度。该研究实现了凸轮泵的快速设计,对同类产品的二次开发具有一定的借鉴意义。展开更多
文摘The performance of a newly designed tri-lobe industrial lobe pump of high capacity is simulated by using commercial CFD solver Ansys Fluent. A combination of user-defined-functions and meshing strategies is employed to capture the rotation of the lobes. The numerical model is validated by comparing the simulated results with the literature values. The processes of suction, displacement, compression and exhaust are accurately captured in the transient simulation. The fluid pressure value remains in the range of inlet pressure value till the processes of suction and displacement are over. The instantaneous process of compression is accurately captured in the simulation. The movement of a particular working chamber is traced along the gradual degree of lobe’s rotation. At five different degrees of lobe’s rotation, pressure contour plots are reported which clearly shows the pressure values inside the working chamber. Each pressure value inside the working chamber conforms to the particular process in which the working chamber is operating. Finally, the power requirement at the shaft of rotation is estimated from the simulated values. The estimated value of power requirement is 3.61 BHP FHP whereas the same calculated theoretically is 3 BHP FHP. The discrepancy is attributed to the assumption of symmetry of blower along the thickness.
文摘In this paper, a time-dependant calculation of flow in a lobe pump is presented. Calculations are performed using the arbitrary Lagrangean Eulerean (ALE) method. A grid manipulator is needed to move the nodes between time steps. The used grid manipulator is based on the pseudo-force idea. This means that each node is fictitiously cormeeted with its 8 neighbours via fictitious springs. The equilibrium of the resulting pseudo spring forces defines the altered position of the nodes. The grid manipulator was coupled with a commercial flow solver and the whole was tested on the flow through a three-lobe lobe pump. Results were obtained for a rotational speed of 460 rpm and incompressible silicon oil as fluid.
文摘为了提高凸轮泵转子的设计效率和精度,对凸轮泵转子的型线参数进行了理论分析,建立了各参数之间的参数化方程,在此基础上,基于SolidWorks平台,采用C#编程语言,在Visual Studio 2017环境下开发了凸轮泵转子型线参数化设计软件。该软件主界面集输入、计算、输出按钮于一体,输入具体工况参数即可进行转子参数计算和设计,软件还提供多叶、直叶、螺旋等转子类型的选择,缩短了计算周期,提高了设计效率。通过数值模拟计算和试验验证,对比了不同压差及不同转速下的流量曲线,软件的设计结果与数值计算和试验结果误差分别在5%和3.0%以内,验证了该软件的设计结果精确度。该研究实现了凸轮泵的快速设计,对同类产品的二次开发具有一定的借鉴意义。
