Numerical Study of Detailed Flow Affecting a Direct Measuring Skin-Friction Gauge
Numerical Study of Detailed Flow Affecting a Direct Measuring Skin-Friction Gauge
复制标题
影响直接测量表面摩擦计的详细流量的数值研究
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Schetz
中科院分区：
文献类型：
--
作者：
M. Maclean;J. Schetz
研究了直接测量摩擦计的详细流动特性。这种类型的装置使用一个小的，可移动的头部，安装在墙壁上，这样头部就被假设暴露在与周围墙壁相同的剪切应力下。由此产生的挠度可以通过诸如安装在头部下方挠曲上的应变计之类的仪器来监测。这项研究的目的是了解设备的几何设计和安装参数对周围流动的影响，以及仪表反映未受干扰的剪切应力值的能力。影响摩擦计性能的因素包括浮头周围的壁面存在必要的间隙，壁面的安装不当/不对中问题，以及压力梯度引起的外来力。本文采用基于有限元技术的三维Navier-Stokes代码对所有这些影响进行了计算研究
The detailed flow characteristics of a direct measuring skin-friction gauge are examined. This type of device uses a small, movable head mounted flush to a wall, such that the head is assumed to be exposed to the same shear stress from the flow as the surrounding wall. The resulting deflection can be monitored by instruments such as strain gauges mounted on a flexure below the head. The goal of this study was to develop an understanding of the effects that the geometric design and installation parameters of the device have on the surrounding flow and the ability of the gauge to reflect the undisturbed shear stress value. Factors influencing the performance of a skin-friction gauge include the presence of the necessary gaps in the wall around the floating head, improper installation/misalignment issues with respect to the wall, and extraneous forces arising from pressure gradients. All of these effects are studied here computationally with a three-dimensional, Navier-Stokes code based on the finite element technique