80025 C-1986

Mean forces@ pressures and flow field velocities for circular cylindrical structures: single cylinder with two-dimensional flow.

80025 C-1986 发布历史

ESDU 80025 provides data for estimating the mean forces and pressures induced by flow normal or inclined to a cylindrical structure of circular cross-section. The data apply when the effect of the flow around the free end (or ends) can be ignored (i.e. for two-dimensional flow). ESDU 81017 provides additional information in the form of correction factors that can be applied to these data to account for end effects and shear flow effects@ such as those associated with cantilever structures in the non-uniform atmospheric wind. Drag coefficients are given as a function of Reynolds number (10E-2 to 10E7)@ the turbulence properties of the oncoming flow and surface roughness for which guidance is given on typical values. The effects of spanwise protrusions and other nearby plane surfaces are quantified as are the effects of perforations and helical strakes. Data are provided@ in equation form@ giving both mean and fluctuating surface pressure distributions and the mean velocity flow field for cylinders with a smooth or rough surface at Reynolds numbers between about 10E5 and 10E7. Calculation sheets are provided to summarise the step-by-step estimation procedures.

80025 C-1986由ESDU - Engineering Sciences Data Unit 发布于 1986-06-01，并于 2004-05-14 实施。

80025 C-1986的历代版本如下：

• 1986年06月01日 80025 C-1986

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标准号

80025 C-1986

发布日期

1986年06月01日

实施日期

2004年05月14日

废止日期

无

中国标准分类号

/

国际标准分类号

/

发布单位

ESDU - Engineering Sciences Data Unit

引用标准

66

适用范围

ESDU 80025 provides data for estimating the mean forces and pressures induced by flow normal or inclined to a cylindrical structure of circular cross-section. The data apply when the effect of the flow around the free end (or ends) can be ignored (i.e. for two-dimensional flow). ESDU 81017 provides additional information in the form of correction factors that can be applied to these data to account for end effects and shear flow effects@ such as those associated with cantilever structures in the non-uniform atmospheric wind. Drag coefficients are given as a function of Reynolds number (10E-2 to 10E7)@ the turbulence properties of the oncoming flow and surface roughness for which guidance is given on typical values. The effects of spanwise protrusions and other nearby plane surfaces are quantified as are the effects of perforations and helical strakes. Data are provided@ in equation form@ giving both mean and fluctuating surface pressure distributions and the mean velocity flow field for cylinders with a smooth or rough surface at Reynolds numbers between about 10E5 and 10E7. Calculation sheets are provided to summarise the step-by-step estimation procedures.