查询词典 riblets

Experimental results show that the vehicle models with transverse riblets surface have obvious drag reduction effect under certain velocity range, the maximal drag reduction effect is 23.5%.

实验结果表明，具有横向脊状表面的航行器模型在一定来流速度范围内具有很好的减阻效果，实验获得的最大减阻量为23.5%。

Using conformal mapping, the longitudinal protrusion height and the lateral protrusion height on the V-grooved surfaces are given, on this basis, some drag reducing features in parallel-flow, cross-flow and enlarge- flow are presented and analyzed; In addition, drag reducing features with blade-shaped grooves and U-shaped grooves are discussed, consequently, the riblets designing criterions are suggested which will reduce the drag and noise most effectively underwater.

3利用保角变换方法求出V—型条纹的纵向和横向突出高度，在此基础上得出纵向流、横向流和带角度流动时的降阻特性，并分析结果；而且分析了叶片型条纹和U—型条纹表面上的降阻情况，提出水下具有最佳降阻效果的条纹表面设计准则。

The near field and radiation field of flow noise are analyzed, and the noise reducing features of riblets are deduced.

5在分析流噪声的近、远场特性的基础上，进一步研究条纹表面的降噪特性。

These results have very important referenced values to simulative calculations and experimental researches on drag and noise reduction with riblets under water.

本文的研究内容对随行波表面水下减阻降噪的仿真模拟计算和实验研究具有重要的参考价值。

In this paper, a theoretical investigation of the drag and noise reduction by riblets is carried out, and these numerical results are compared with those obtained from experiments with riblets in water tunnel, and it is found that they agree with each other in tendency and numerical value.

本文从理论上分析了条纹表面的减阻降噪特性，并将计算结果与水洞模型贴膜实验进行了对比，两者在趋势和数值上基本一致。

Experimental study and numerical simulation about turbulent boundary layer drag reduction of riblets surface were carried out for increasing voyage and speed of vehicle.

针对航行器提高航程和航速的需要，开展脊状表面湍流边界层减阻的实验和数值仿真研究。

A 2-D wind tunnel is built which is used to study tuthlent boundary layer on riblets as well as smooth plate surfaces.

设计并建造了一座二维低速风洞系统，用于壁面湍流边界层的减阻机理研究。

The flow in the vicinity of riblets is investigated numerically by a vorticity formulation, and two drag reducing features of riblets are obtained and analyzed.

2利用涡理论方法对近壁面流场进行数值计算，得到层流和湍流状态下的两组降阻曲线，并加以分析。

Under the experimental conditions of the dissertation, more than 10% loss reductions have been obtained by using the blades with riblets only on the pressure surface at both high and moderate loading.

首次将表面开槽减阻技术用于平面扩压叶栅中，取得明显的减损效果，其结果表明：在本试验条件下，采用叶盆单面开槽叶片方案，在中等和高负载条件下，均获得10%以上的减损增益。

Numerical simulations of fully developed turbulent flow over triangle,scallop and blade riblets biomimetics non-smooth surface were performed to educe the reason of different drag reduction by different riblets,which can provide guide for design optimization riblets.

分析了三种沟槽非光滑表面的流场特性，对计算域中心Z=3mm平面的速度场和湍流统计量进行了研究，分析了不同沟槽形状对减阻效果的影响，为最佳减阻沟槽设计提供了理论依据。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。