This paper discusses the application of the CFD method in our automobile in exterior flowfield,simulates the model of the experiment of wind tunnel,calculates the drag coefficient and lift coefficient,and introduces how we modify the empennage and get a good result.
该文利用CFD方法对某款汽车的外流场进行模拟,模型模仿风洞实验,计算出该汽车的风阻系数和升力系数,并对尾部扰流板进行了改进,最终得到了满足设计要求的流场性能。
The comparison of two group Yb film sensors,one is unheated treatment and the other is heat treatment at 300 ℃ for 1 h in vacuum,indicates that the piezoresistance coefficient of the heated film is larger than not only the unheated,but also the Yb foils.
采用真空蒸发工艺制备镱薄膜传感器,在小于1GPa压力范围内对未经任何处理和300℃真空热处理1h两组镱薄膜传感器进行准静态加载标定,后者的压阻系数明显高于前者,并且大于箔式镱传感器的压阻系数,结合扫描电镜和电学性能测试分析,发现热处理有助于薄膜晶粒长大,降低薄膜电阻率,从而提高了镱薄膜传感器的压阻灵敏度。
Although the film was the same metal construction feature as manganin alloy does,it has smaller crystalloid size,twice resistivity and less piezoresistance coefficient than the alloy.
但是 ,锰铜镀膜的结晶晶粒度与工业生产的锰铜合金还有较大差别 ,宏观物理量表现为 :电阻率偏高 ,冲击压阻系数偏小。
According to the present experiment results,the precision of all calculation correlations for resistance factor in transition zone and laminar zone was compared.
根据已有的实验结果,分析比较了过渡区和层流区各种阻力系数模型计算的准确性,以及各流型之间过渡时的基本变化特征。
25 μm~2 by using an injecting procedure fresh water (TSD=729 mg/L)-gel-produced or fresh water with total volume injected >5 PV, the resistance factor, F__R, determined is in range 266.
用大庆采油二厂的污水(矿化度4013mg/L)配制不同HPAM浓度的Al3+交联聚合物凝胶,在气测渗透率1 25μm2的人造岩心上,按清水(矿化度729mg/L)—凝胶—污水或清水的注入程序,注入量>5PV,测得凝胶中HPAM浓度为0 6、0 5、0 4g/L时,残余阻力系数FRR(368 6～277 4)大于阻力系数FR(266 7～246 0),二者均随HPAM浓度减小而减小;后续注入清水时FRR较低;凝胶中HPAM浓度为0 3g/L时FRR
This paper has studied the convergence of iteration algorithm for colebrook s formula which has been used to determining the resistance factor about industrial pipes in three regions of turbulent flow resistance (i.
本文研究了适用于工业管道紊流三个阻力区（即光滑区、过渡区和粗糙区）阻力系数计算的柯列勃洛克公式迭代算法的收敛性，给出了收敛区间。
Attention to detail led to a car with a drag coefficient value of just 0.26 - the lowest of any sedan in its class.
值得关注的是 LS430 的风阻系数达到 0.26—— 在同等级别的轿车中最为出色。
Friction index: close to galvanized iron duct.
沿程摩阻系数：沿程摩阻系数接近镀锌铁皮风管。
Study of Pressure Loss Coefficient in HVAC Fittings;
通风管道局部构件阻力系数及减阻方法研究
EXPERIMENT AND RESEARCH OF BLOCKING CORRECTING COEFFICIENT OF WIND SPEED SENSOR
风速传感器阻塞修正系数试验与研究
Correction for Damping Ratio of Wind-induced Dynamic Responses for Structural Aeroelastic Model
大跨度结构气弹模型风振响应的阻尼修正系数
Research of Wind-induced Vibration Coefficient for Transmission Towers using Lead Rubber Dampers
橡胶铅芯阻尼器控制下输电塔风振系数研究
Experiment and Numerical Simulation of Resistance Coefficient of 90° Bend Pipe with Low Reynolds Number in HVAC
通风空调低雷诺数90°弯管阻力系数的实验与数值模拟
resistance-temperature coefficient (of resistance thermometer sensor)
（热电阻的）电阻温度系数
Numerical and Experimental Study of Pressure Loss Coefficient in HVAC Fittings;
通风管道局部构件阻力系数的实验和数值模拟研究
damping coefficient
减幅系数，阻尼系数
drag coefficient
牵引系数，阻力系数
Parameter optimization for SVC control systems for improving damping properties of power systems connected with wind farms
用于改善含风电场电力系统阻尼特性的SVC控制系统参数优化方法
The specific resistance of iron is not so small as that of copper
铁的电阻系数不如铜的电阻系数那样
blade profile drag coefficient
桨叶剖面阻力系数，叶型阻力系数
full auto choke system (FACS)
全自动阻风门控制系统
Damping control and parameter optimization of wind-induced responses of semi-flexible suspension systems
半柔性悬挂结构体系的风振响应参数优化及阻尼控制
Increasing original resistan coefficient of the secondary air duct can improve the adjusting performance of air damper, and inhibit pulsation of the flow rate.
增加二次风道的原始阻力系数，可以使风门的调节特性得到改善并抑制流量脉动。
Experimental and Numerical Study on the Mechanism of the Reducing Pressure Drop Stick in Cyclones;
旋风分离器减阻杆减阻机理的实验和数值研究