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回转体微气泡减阻影响因素理论研究

Keywords: 回转体, 微气泡, 空隙率, 减阻

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Abstract:

为了研究影响回转体微气泡减阻率大小的因素,运用Fluent 6.3软件对某回转体微气泡减阻模型进行了数值计算,分析了喷气速度与来流速度的比值、喷气角度、气泡尺度及空隙率分布等因素对减阻率的影响程度和规律,初步揭示了微气泡减阻的机理,研究了饱和喷气量的形成原因。结果表明,微气泡可使回转体局部摩擦阻力减少80%,总阻力减少约30%;微气泡减阻率的高低主要由喷气速度与来流速度之比、近壁面处空隙率的大小及分布所决定,而与喷气角度以及一定范围内的气泡尺度关系不大;喷气流量增大,摩擦阻力下降,粘压阻力增加,当摩擦阻力减少量与粘压阻力增加量相当时,达到饱和气量。在喷气流量未达到饱和值时,总阻力随气流量的增大而减少。

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