目的使用计算流体力学数值模拟离心血泵内的流场,对计算结果和实验结果进行对比,评估计算方法的可靠性。方法以美国食品药品监督管理局(Food and Drug Administration,FDA)提供的血泵标模进行数值仿真,针对2号工况(转子转速3500 r/min,...目的使用计算流体力学数值模拟离心血泵内的流场,对计算结果和实验结果进行对比,评估计算方法的可靠性。方法以美国食品药品监督管理局(Food and Drug Administration,FDA)提供的血泵标模进行数值仿真,针对2号工况(转子转速3500 r/min,入口体积流量2.5 L/min),分别用SRF旋转参考坐标系方法和滑移网格方法进行定常和非定常流动的数值模拟,将计算结果与FDA通过粒子图像测速法(particle image velocimetry,PIV)获得的流场数据进行比对,探究数据可信度。展开更多
The reverse magnetohydrodynamic(MHD)energy bypass technology is a promising energy redis⁃tribution technology in the scramjet system,in augmented with a power generation equipment to supply the neces⁃sary long-distanc...The reverse magnetohydrodynamic(MHD)energy bypass technology is a promising energy redis⁃tribution technology in the scramjet system,in augmented with a power generation equipment to supply the neces⁃sary long-distance flight airframe power.In this paper,a computational model of the scramjet magnetohydrody⁃namic channel is developed and verified by using the commercial software Fluent.It is found that when the mag⁃netic induction intensity is 1,2,3,4 T,the power generation efficiency is 22.5%,22.3%,22.0%,21.5%,and decreases with the increase of the magnetic induction intensity,and the enthalpy extraction rate is 0.026%,0.1%,0.21%,0.34%,and increases with the increase of the magnetic induction intensity.The deceleration ef⁃fect of electromagnetic action on the airflow in the power channel increases with the increase of magnetic induc⁃tion intensity.The stronger the magnetic field intensity,the more obvious the decreasing effect of fluid Mach num⁃ber in the channel.The power generation efficiency decreases as the magnetic induction intensity increases and the enthalpy extraction rate is reversed.As the local currents gathering at inlet and outlet of the power generation area,total temperature and enthalpy along the flow direction do not vary linearly,and there are maximum and minimum values at inlet and outlet.Increasing the number of electrodes can effectively regulate the percentage of Joule heat dissipation,which can improve the power generation efficiency.展开更多
文摘目的使用计算流体力学数值模拟离心血泵内的流场,对计算结果和实验结果进行对比,评估计算方法的可靠性。方法以美国食品药品监督管理局(Food and Drug Administration,FDA)提供的血泵标模进行数值仿真,针对2号工况(转子转速3500 r/min,入口体积流量2.5 L/min),分别用SRF旋转参考坐标系方法和滑移网格方法进行定常和非定常流动的数值模拟,将计算结果与FDA通过粒子图像测速法(particle image velocimetry,PIV)获得的流场数据进行比对,探究数据可信度。
文摘The reverse magnetohydrodynamic(MHD)energy bypass technology is a promising energy redis⁃tribution technology in the scramjet system,in augmented with a power generation equipment to supply the neces⁃sary long-distance flight airframe power.In this paper,a computational model of the scramjet magnetohydrody⁃namic channel is developed and verified by using the commercial software Fluent.It is found that when the mag⁃netic induction intensity is 1,2,3,4 T,the power generation efficiency is 22.5%,22.3%,22.0%,21.5%,and decreases with the increase of the magnetic induction intensity,and the enthalpy extraction rate is 0.026%,0.1%,0.21%,0.34%,and increases with the increase of the magnetic induction intensity.The deceleration ef⁃fect of electromagnetic action on the airflow in the power channel increases with the increase of magnetic induc⁃tion intensity.The stronger the magnetic field intensity,the more obvious the decreasing effect of fluid Mach num⁃ber in the channel.The power generation efficiency decreases as the magnetic induction intensity increases and the enthalpy extraction rate is reversed.As the local currents gathering at inlet and outlet of the power generation area,total temperature and enthalpy along the flow direction do not vary linearly,and there are maximum and minimum values at inlet and outlet.Increasing the number of electrodes can effectively regulate the percentage of Joule heat dissipation,which can improve the power generation efficiency.
