Analysis of Flow Structure in Microturbine Operating at Low Reynolds Number  

作　　者：Mohamed Omri Yusuf Al-Turki Ahmed A.Alghamdi Amrid Amnache Luc G.Fréchette 

机构地区：[1]King Abdulaziz University,Deanship of Scientific Research,Jeddah,Saudi Arabia [2]King Abdulaziz University,Electrical and Computer Engineering Department,Jeddah,Saudi Arabia [3]Universitéde Sherbrooke,Interdisciplinary Institute for Technological Innovation(3IT),Sherbrooke,Canada

出　　处：《Computers, Materials & Continua》2022年第4期961-977,共17页计算机、材料和连续体（英文）

基　　金：This project was funded by the National Plan for Science,Technology and Innovation(MAARIFAH)-King Abdulaziz City for Science and Technology-the Kingdom of Saudi Arabia-award number 14-ENE2142-03.

摘　　要：In this paper,three-dimensional flows in laminar subsonic cascades at relatively low Reynolds numbers(Re<2500)are presented,based on numerical calculations.The stator and rotor blade designs are those for a MEMS-based Rankine microturbine power-plant-on-a-chip with 109-micron chord blades.Blade passage calculations in 3D were done for different Reynolds numbers,tip clearances(from 0 to 20%)and incidences(0◦to 15◦)to determine the impact of aerodynamic conditions on the flow patterns.These conditions are applied to a blade passage for a stationary outer casing.The 3D blade passage without tip clearance indicates the presence of two large symmetric vortices due to the interaction between hub/casing boundary layers and the blade.Opening the tip clearance introduces the tip vortex,which tends to become dominant above a tip clearance of 10%.In addition to providing a description and understanding of the 3D flow in a MEMS microturbine,these results suggest the importance of considering 3D flows in the design of microturbomachinery,even though the geometry is dominantly 2D.

关 键 词：Microturbomachinery TURBINE VORTEX internal flows secondary flows 

分 类 号：O35[理学—流体力学]