摘要
基于仿生微小非光滑表面具有减黏降阻特性的基本思想,将高速纺杯表面布置不同形状和尺寸的非光滑沟槽。采用RNGk-ε模型对其三维流场进行模拟,分别计算光滑纺杯与非光滑纺杯壁面阻力系数。对比二者壁面剪应力大小与周围速度流场可知,将微小非光滑仿生沟槽表面布置于高速纺杯表面,可降低纺杯在纺纱器内高速气流对壁面的空气阻力,从而降低转杯纺纱机的动力消耗,并且沟槽形状和深度均对纺杯壁面阻力产生不同影响。与光滑纺杯相比,三角形、半圆形、矩形3种沟槽纺杯最大减阻率分别为1.271%、1.261%和1.385%。
In view of the idea that bionic non-smooth surface can reduce drag,different sizes and shapes of grooves are arranged on the surface of high-speed rotors.With RNG k-ε turbulence model,the 3D flow field of the models has been simulated to calculate the drag coefficients of both smooth and non-smooth rotors respectively.In comparison with the wall shear stress of rotors and velocity field,the result shows that high-speed rotors with tiny non-smooth groove can reduce drag force of high-speed air flow on the wall of rotors,thereby decreasing energy consumption of rotor spinning machines.In addition,both depth and shape of grooves have an influence on drag force.Compared to smooth rotors,the maximum drag reduction of triangle groove rotor,semi-circle groove rotor and the rectangle groove rotor,is up to 1.271%,1.261%,1.385% respectively.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2010年第5期117-121,共5页
Journal of Textile Research
关键词
纺杯
非光滑表面
减阻
数值模拟
rotor
non-smooth surface
drag reduction
numerical simulation
