This paper describes the methods of fan testing and making fan property curve by dimensionless characteristic coefficient for the cooling fan of air-cooled engines.

The evolution of 2/ 1 mode relative to the dimensionless viscous coefficient and the distribution of current density is given.

结果给出了2/1模的演变过程对无量纲粘滞系数的依赖关系和电流密度的分布。

A dimensionless coefficient C_b which is dependent on R/ B and bedload friction coefficient is defined This model verifies theoretically the maximal values of rate of bend migration as R/ B is value between 2 and 4.

模式中引入了一个与R/B和床沙摩阻系数有关的无量纲系数C b，从理论上证明了当弯道R/B介于2～4之间时，蠕动速率取最大值。

Dimensionless coefficient method of designing the welding section of axial pressure component with H shape

焊接H形轴压构件截面设计的无量纲系数法

The numerical results show that mass ratio, dimensionless relaxation coefficient and dimensionless elastic constant ratio all have influence on the dynamic characteristics and stability of the viscoelastic pipe conveying fluid.

计算结果表明，质量比、无量纲松弛系数及无量纲弹性常数比对输流管道的动力特性均有影响。

On the other side, the time of gas breakthrough decreases, the oxygen content of the breakthrough gas decreases and the displacement efficiency at gas breakthrough increases with the increase of the temperature when the dimensionless pressure is constant.

无因次压力一定时，随着温度的升高，气体突破时间缩短，突破气体含氧量降低，气体突破时驱油效率增加。

CASE damping constant Jc is an important dimensionless experienced constant during high strain dynamic pile testing.

CASE阻尼系数（Jc）是CASE法高应变动力试桩中一个重要的无量纲经验系数。

Describing the power-split strategy of powertrain and the influence of fuel consumption by introducing the dimensionless separation factor.

通过引入无量纲的分离因子，描述整车动力总成的能量分配策略及其对油耗的影响。

Substance converting heat into electric energy under certain range of temperature is called thermoelectric material, of which converting efficiency is mainly determined by its own intrinsic properties and evaluated by ZT of dimensionless factor.

在一定的温差下，可将热能转换为电能的材料称为温差电材料。其热电转换效率的大小主要取决于材料的性能，通常用无量纲因子ZT来表示。

Using the establishment gap axis fatigue life model, through the computation, the relational expression between the gap radius, the gap open angle, the gap depth and the dimensionless factor has been established.

应用建立的缺口轴疲劳寿命模型，通过计算，得到了缺口半径、缺口张开角和缺口深度与无量纲因子的关系表达式。

Furthermore, desulfurization efficiency model of concentrated alkali dual-alkali FGD system with a dimensionless factor ε was proposed, which can be used to guide the design and optimize the operations.

此外，提出了用一个综合影响因子ε表达的浓碱双碱法脱硫效率模型，该模型可用于工艺参数优化、指导工艺设计。

The performance of fin comprehensively by using dimensionless factor j/ f1/ 3 was evaluated and optimized respectively.

采用无量纲因子j/f1/3归对翅片的性能进行综合评价，并对其进行优化。

The result indicated that the gap radius, gap depth and gap opening angle are a function of the dimensionless factor.

结果表明，缺口半径、缺口深度和缺口张开角都是无量纲因子的函数，而且随着缺口半径逐渐增大，缺口轴的疲劳寿命基本呈现增大的趋势。

The expression based on the stress field near the tip gap, dimensionless factor is be obtained.

基于缺口尖端附近的应力场表达式，得出无量纲因子。

The Laplace space solution to dimensionless reservoir pressure and dimensionless bottom pressure of variable flow problem, which takes into consideration the effect of three kinds of outer boundary conditions, is studied by using multi-layered reservoir model.

针对层间无窜流的多层油藏渗流模型，研究了3种外边界下的交流率问题的储层压力动态分布和井底压力的Laplace空间解。

A dimensionless variable is defined and a new calculation model of water volume fraction is deduced to accurately measure water volume fraction in oil-water two-phase flow according to the real density of the mixture.

根据油水混合物的真实密度值也能较精确地确定其含水率，计算式的误差小于3%。

The infeasible solutions violating either logical relation constraints among activities or resources constraints can be avoided through introducing a dimensionless variable named extended float time rate and utilizing penalty function.

通过引入无量纲化的扩展工时率变量和罚函数，则可以避免求解得到不满足作业间逻辑关系或资源约束的非可行解。

A dimensionless variable named as duration prolonging rate is introduced to show the prolonged degree of activity duration.

在该模型中，允许适当延长作业的工期来降低作业的资源强度，并引入工期延长率这一无量纲变量来表示作业工期所延长的程度。

The Dimensionless Representation of Collection Efficiency of Cyclones

旋风分离器捕集效率的无量纲表示

Based on the analysis and numerical results, the physical mechanism of thermal drive in centrifugal fields is advanced, and a dimensionless parameter group is suggested to measure the relative importance of buoyancy and rotation to the mean equivalent conductivity.

通过方程分析和数值模拟提出了离心力场热驱动流的物理机制以及自然对流和旋转流相对作用大小的判别依据；

A correlation formula with dimensionless number group is established to calculate the drying intensity.

在此基础上，结合因次分析法，建立了用于计算干燥强度的准数关联模型。