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Zhen Wu,Xinxue Chai,Wei Ye 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
This paper proposes a new 2R1T PRS-PRU-PUR overconstrained parallel mechanism (PM). Firstly, the kinematics and stiffness are studied based on screw theory and strain energy. Compared with a typical 3-PRS PM, the main advantage of the proposed PRSPRU-PUR PM is that the orientational range β is improved by 50 %. Secondly, the original PM’s kinematic and stiffness performance are evaluated by using the global transmission index and stiffness index, which are 0.675 and 594 respectively, which causes the decrease of the efficiency of some configurations. Finally, the design parameters are optimized to enhance the PM’s kinematic and stiffness performance. The corresponding optimized indices were increased to 0.915 and 2171, respectively, confirming the validity of the optimal design method.
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Study of flow instability in a centrifugal fan based on energy gradient theory
Meina Xiao,Qing Xiao,Hua-Shu Dou,Xiaoyang Ma,Yongning Chen,Haijiang He,Xinxue Ye 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.2
Flow instability in a centrifugal fan was studied using energy gradient theory. Numerical simulation was performed for the threedimensional turbulent flow field in a centrifugal fan. The flow is governed by the three-dimensional incompressible Navier-Stokes equations coupled with the RNG k-ε turbulent model. The finite volume method was used to discretize the governing equations and the Semiimplicit method for pressure linked equation (SIMPLE) algorithm is employed to iterate the system of the equations. The interior flow field in the centrifugal fan and the distribution of the energy gradient function K are obtained at different flow rates. According to the energy gradient method, the area with larger value of K is the place where the flow loses stability easier. The results show that instability is easier to generate in the regions of impeller outlet and volute tongue. The air flow near the hub is more stable than that near the shroud. That is due to the influences of variations of the velocity and the inlet angle along the axial direction. With the decrease of the flow rate, instability zone in a blade channel moves to the impeller inlet from the outlet and the unstable regions in different channels develop in opposite direction to the rotation of impeller.
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