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1.发明授权Oscillatory motion based measurement method and sensor for measuring wall shear stress due to fluid flow 失效基于振荡运动的测量方法和用于测量由于流体流动导致的壁剪切应力的传感器公开(公告)号：US07418876B2
公开(公告)日：2008-09-02
申请号：US10557999
申请日：2004-05-20
IPC分类号： G01N3/24
CPC分类号： G01N3/24 , G01N13/02 , G01N2013/0216 , G01N2203/0005 , G01N2203/0025
摘要： A shear stress sensor for measuring fluid wall shear stress on a test surface is provided. The wall shear stress sensor is comprised of an active sensing surface and a sensor body. An elastic mechanism mounted between the active sensing surface and the sensor body allows movement between the active sensing surface and the sensor body. A driving mechanism forces the shear stress sensor to oscillate. A measuring mechanism measures displacement of the active sensing surface relative to the sensor body. The sensor may be operated under periodic excitation where changes in the nature of the fluid properties or the fluid flow over the sensor measurably changes the amplitude or phase of the motion of the active sensing surface, or changes the force and power required from a control system in order to maintain constant motion. The device may be operated under non-periodic excitation where changes in the nature of the fluid properties or the fluid flow over the sensor change the transient motion of the active sensor surface or change the force and power required from a control system to maintain a specified transient motion of the active sensor surface.
摘要翻译： 提供了一种用于测量测试表面上的流体壁剪切应力的剪切应力传感器。 壁剪切应力传感器由主动感测表面和传感器体构成。 安装在主动感测表面和传感器主体之间的弹性机构允许主动感测表面和传感器主体之间的移动。 驱动机构迫使剪切应力传感器振荡。 测量机构测量主动感测表面相对于传感器主体的位移。 传感器可以在周期性激励下操作，其中流体特性的性质或传感器上的流体流动的变化可测量地改变主动感测表面的运动的幅度或相位，或者改变控制系统所需的力和功率 以保持恒定运动。 该装置可以在非周期性激励下操作，其中流体性质的性质或者传感器上的流体流动的变化改变了主动传感器表面的瞬态运动，或改变了从控制系统所需的力和功率，以维持指定的 有源传感器表面的瞬态运动。
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公开(公告)号：US6109293A
公开(公告)日：2000-08-29
申请号：US925535
申请日：1997-09-08
摘要： The present invention provides an axially-rotated valve which permits increased flow rates and lower pressure drop (characterized by a lower loss coefficient) by using an axial eccentric split venturi with two portions where at least one portion is rotatable with respect to the other portion. The axially-rotated valve typically may be designed to avoid flow separation and/or cavitation at full flow under a variety of conditions. Similarly, the valve is designed, in some embodiments, to produce streamlined flow within the valve. A typical cross section of the eccentric split venturi may be non-axisymmetric such as a semicircular cross section which may assist in both throttling capabilities and in maximum flow capacity using the design of the present invention. Such a design can include applications for freeze resistant axially-rotated valves and may be fully-opened and fully-closed in one-half of a complete rotation. An internal wide radius elbow typically connected to a rotatable portion of the eccentric venturi may assist in directing flow with lower friction losses. A valve actuator may actuate in an axial manner yet be uniquely located outside of the axial flow path to further reduce friction losses. A seal may be used between the two portions that may include a peripheral and diametrical seal in the same plane.
摘要翻译： 本发明提供一种轴向旋转的阀，其通过使用具有至少一个部分可相对于另一部分旋转的两个部分的轴向偏心分流文丘里管来允许增加的流量和较低的压降（其特征在于较低的损失系数）。 轴向旋转的阀通常可以设计成在各种条件下在全流动下避免流动分离和/或空化。 类似地，在一些实施例中，阀被设计成在阀内产生流线型流动。 偏心分流文丘里管的典型横截面可以是非轴对称的，例如使用本发明的设计可以有助于节流能力和最大流量的半圆形横截面。 这种设计可以包括用于防冻轴向旋转阀的应用，并且可以在完全旋转的一半中完全打开和完全闭合。 典型地连接到偏心文丘里管的可旋转部分的内部宽半径弯头可以有助于以较低的摩擦损失引导流动。 阀致动器可以轴向致动而唯一地位于轴向流动路径的外部，以进一步减少摩擦损失。 可以在两个部分之间使用密封件，这两个部件可以在同一平面内包括周边和直径的密封件。
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公开(公告)号：US06279595B1
公开(公告)日：2001-08-28
申请号：US09619347
申请日：2000-07-19
IPC分类号： F16K302
CPC分类号： E03B9/025 , E03B9/02 , F16K1/22 , F16K3/085 , Y10T137/0396 , Y10T137/698
摘要： The present invention provides an axially-rotated valve which permits increased flow rates and lower pressure drop (characterized by a lower loss coefficient) by using an axial eccentric split venturi with two portions where at least one portion is rotatable with respect to the other portion. The axially-rotated valve typically may be designed to avoid flow separation and/or cavitation at full flow under a variety of conditions. Similarly, the valve is designed, in some embodiments, to produce streamlined flow within the valve. A typical cross section of the eccentric split venturi may be nonaxisymmetric such as a semicircular cross section which may assist in both throttling capabilities and in maximum flow capacity using the design of the present invention. Such a design can include applications for freeze resistant axially-rotated valves and may be fully-opened and fully-closed in one-half of a complete rotation. An internal wide radius elbow typically connected to a rotatable portion of the eccentric venturi may assist in directing flow with lower friction losses. A valve actuator may actuate in an axial manner yet be uniquely located outside of the axial flow path to further reduce friction losses. A seal may be used between the two portions that may include a peripheral and diametrical seal in the same plane.
摘要翻译： 本发明提供一种轴向旋转的阀，其通过使用具有至少一个部分可相对于另一部分旋转的两个部分的轴向偏心分流文丘里管来允许增加的流量和较低的压降（其特征在于较低的损失系数）。 轴向旋转的阀通常可以设计成在各种条件下在全流动下避免流动分离和/或空化。 类似地，在一些实施例中，阀被设计成在阀内产生流线型流动。 偏心分流文丘里管的典型横截面可以是非轴对称的，例如可以使用本发明的设计有助于节流能力和最大流量的半圆形横截面。 这种设计可以包括用于防冻轴向旋转阀的应用，并且可以在完全旋转的一半中完全打开和完全闭合。 典型地连接到偏心文丘里管的可旋转部分的内部宽半径弯头可以有助于以较低的摩擦损失引导流动。 阀致动器可以轴向致动而唯一地位于轴向流动路径的外部，以进一步减少摩擦损失。 可以在两个部分之间使用密封件，这两个部件可以在同一平面内包括周边和直径的密封件。
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公开(公告)号：US06557576B2
公开(公告)日：2003-05-06
申请号：US09941080
申请日：2001-08-27
IPC分类号： F16K302
CPC分类号： E03B9/025 , E03B9/02 , F16K1/22 , F16K3/085 , Y10T137/0396 , Y10T137/698
摘要： An axially-rotated valve permitting increased flow rates and lower pressure drop is disclosed using an axial eccentric split venturi with two portions where at least one portion is rotatable with respect to the other portion. A cross section of the eccentric split venturi may be non-axisymmetric such as a semicircular cross section which may assist in both throttling capabilities and in maximum flow capacity. Applications are disclosed for freeze resistant axially-rotated valves which may be fully-opened and fully-closed in one-half of a complete rotation. An internal wide radius elbow connected to a rotatable portion of the eccentric venturi may assist in directing flow with lower friction losses. A valve actuator may actuate in an axial manner located outside of the axial flow path. A seat may be used between the two portions that may include a peripheral and diametrical seal in the same plane.
摘要翻译： 公开了一种允许增加流速和降低压降的轴向旋转的阀，其使用具有两个部分的轴向偏心分流文丘里管，其中至少一个部分可相对于另一部分旋转。 偏心分流文丘里管的横截面可以是非轴对称的，例如可以有助于节流能力和最大流量的半圆形横截面。 公开了用于防冻轴向旋转阀的应用，其可以完全旋转的一半完全打开和完全闭合。 连接到偏心文丘里管的可旋转部分的内部宽半径弯头可以有助于以较低摩擦损失引导流动。 阀致动器可以以位于轴向流动路径外部的轴向方式致动。 可以在两个部分之间使用一个座，这些部分可以包括在同一平面内的周边和直径的密封。
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公开(公告)号：US06026845A
公开(公告)日：2000-02-22
申请号：US121650
申请日：1998-07-23
CPC分类号： E03B9/02 , E03B9/025 , F16K1/22 , F16K3/085 , Y10T137/698
摘要： The present invention provides an axially-rotated valve which permits increased flow rates and lower pressure drop (characterized by a lower loss coefficient) by using an axial eccentric split venturi with two portions where at least one portion is rotatable with respect to the other portion. The axially-rotated valve typically may be designed to avoid flow separation and/or cavitation at full flow under a variety of conditions. Similarly, the valve is designed, in some embodiments, to produce streamlined flow within the valve. An axially aligned outlet may also increase the flow efficiency. A typical cross section of the eccentric split venturi may be non-axisymmetric such as a semicircular cross section which may assist in both throttling capabilities and in maximum flow capacity using the design of the present invention. Such a design can include applications for freeze resistant axially-rotated valves and may be fully-opened and fully-closed in one-half of a complete rotation. An internal wide radius elbow typically connected to a rotatable portion of the eccentric venturi may assist in directing flow with lower friction losses. A valve actuator may actuate in an axial manner yet be uniquely located outside of the axial flow path to further reduce friction losses. A seal may be used between the two portions that may include a peripheral and diametrical seal in the same plane. A seal separator may increase the useful life of the seal between the fixed and rotatable portions.
摘要翻译： 本发明提供一种轴向旋转的阀，其通过使用具有至少一个部分可相对于另一部分旋转的两个部分的轴向偏心分流文丘里管来允许增加的流量和较低的压降（其特征在于较低的损失系数）。 轴向旋转的阀通常可以设计成在各种条件下在全流动下避免流动分离和/或空化。 类似地，在一些实施例中，阀被设计成在阀内产生流线型流动。 轴向对齐的出口也可以增加流动效率。 偏心分流文丘里管的典型横截面可以是非轴对称的，例如使用本发明的设计可以有助于节流能力和最大流量的半圆形横截面。 这种设计可以包括用于防冻轴向旋转阀的应用，并且可以在完全旋转的一半中完全打开和完全闭合。 典型地连接到偏心文丘里管的可旋转部分的内部宽半径弯头可以有助于以较低的摩擦损失引导流动。 阀致动器可以轴向致动而唯一地位于轴向流动路径的外部，以进一步减少摩擦损失。 可以在两个部分之间使用密封件，这两个部件可以在同一平面内包括周边和直径的密封件。 密封分离器可以增加固定部分和可旋转部分之间的密封的使用寿命。
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