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    • 1. 发明申请
    • Apparatus and Method for Identification of Swirling Flow
    • 用于识别旋流的装置和方法
    • US20070294066A1
    • 2007-12-20
    • US11568220
    • 2005-04-25
    • Katsuyuki NakayamaKenji Umeda
    • Katsuyuki NakayamaKenji Umeda
    • G06G7/50
    • G01P5/001
    • A swirling flow identification apparatus includes an eigenequation calculation section 3 and a swirl axis calculation section 4. The eigenequation calculation section 3, based on velocity data of a fluid at a coordinate point, calculates an eigenvalue through an eigenequation concerning the coordinate point and the velocity data. The swirl axis calculation section 4, if the eigenvalue is a complex number, defines an imaginary part of the complex number as a swirl function, calculates a coordinate point providing a local maximum value in the swirl function and defines the coordinate point providing the local maximum value as the position of a swirling axis of a swirling flow in the fluid. With this, even under the presence of another flow or a plurality of swirling flow, the swirling flow can be adequately identified by using the velocity vector at each of node points (coordinate points).
    • 回旋流识别装置包括氙量计算部3和旋流轴计算部4。 基于坐标点处的流体的速度数据的计算单元3通过关于坐标点和速度数据的特征来计算特征值。 旋转轴计算部分4如果特征值是复数,则将复数的虚部定义为旋转函数,计算在涡旋函数中提供局部最大值的坐标点,并定义提供局部最大值的坐标点 值作为流体中旋流的旋转轴的位置。 由此,即使在存在另一个流动或多个旋转流的情况下,也可以通过在每个节点(坐标点)处使用速度矢量来适当地识别旋转流。
    • 2. 发明授权
    • Apparatus and method for identification of swirling flow
    • 用于识别旋流的装置和方法
    • US07765090B2
    • 2010-07-27
    • US11568220
    • 2005-04-25
    • Katsuyuki NakayamaKenji Umeda
    • Katsuyuki NakayamaKenji Umeda
    • G06F7/60G06F17/10
    • G01P5/001
    • A swirling flow identification apparatus includes an eigenequation calculation section 3 and a swirl axis calculation section 4. The eigenequation calculation section 3, based on velocity data of a fluid at a coordinate point, calculates an eigenvalue through an eigenequation concerning the coordinate point and the velocity data. The swirl axis calculation section 4, if the eigenvalue is a complex number, defines an imaginary part of the complex number as a swirl function, calculates a coordinate point providing a local maximum value in the swirl function and defines the coordinate point providing the local maximum value as the position of a swirling axis of a swirling flow in the fluid. With this, even under the presence of another flow or a plurality of swirling flow, the swirling flow can be adequately identified by using the velocity vector at each of node points (coordinate points).
    • 回旋流识别装置包括异能计算部3和旋转轴计算部4.基于坐标点的流体的速度数据,计算计算部3通过关于坐标点和速度的特征来计算特征值 数据。 旋转轴计算部分4如果特征值是复数,则将复数的虚部定义为旋转函数,计算在涡旋函数中提供局部最大值的坐标点,并定义提供局部最大值的坐标点 值作为流体中旋流的旋转轴的位置。 由此,即使在存在另一个流动或多个旋转流的情况下,也可以通过在每个节点(坐标点)处使用速度矢量来适当地识别旋转流。