公开(公告)号：US20160041016A1

公开(公告)日：2016-02-11

申请号：US14652847

申请日：2013-11-25

Applicant: ENDRESS+HAUSER FLOWTEC AG

Inventor： Christoph Gossweiler ,  Rainer Hocker ,  Marc Hollmach ,  Christian Kahr ,  Silvio Krauss ,  Dirk Sutterlin ,  Daniel Wymann

IPC: G01F1/32

CPC classification number: G01F1/3209 ,  G01F1/3254 ,  G01F1/74

Abstract: A vortex flow measuring device as well as a method for determining by means of a vortex, flow measuring a device, which has a bluff body protruding into the flowing medium and a vortex sensor, the mass flow ratio (x) of an at least at times two- or multiphase medium flowing in a measuring tube and having a gaseous first phase flowing with a first mass flow rate {dot over (m)}G and a liquid second phase flowing with a second mass flow rate {dot over (m)}L. The gaseous phase has a first density (ρG), which differs from a second density (ρL) of the liquid phase, comprising: producing Kármán vortices in the flowing medium at least in the region of the vortex sensor by means of the bluff body, the vortices are shed from the bluff body with a vortex shedding frequency (fv) dependent on an instantaneous flow velocity of the flowing medium; registering by means of the vortex sensor periodic pressure fluctuations caused by the Kármán vortex in the flowing medium for producing a sensor signal corresponding to the pressure fluctuations; selecting from the sensor signal a wanted signal component, which has a frequency band, especially a narrow frequency band, containing the vortex shedding frequency, especially with a relative bandwidth less than 50% of the instantaneous vortex shedding frequency, wherein preferably the instantaneous vortex shedding frequency represents the center frequency of the frequency bandwidth; and applying the wanted signal component (M) for determining a mass flow ratio (x) of the flowing medium, wherein the mass flow ratio (x) is defined as a ratio of the first mass flow {dot over (m)}G to a total mass flow, with which the medium flows, especially according to a formula: x = m . G m . L + m . G  .

Abstract translation: 涡流测量装置以及通过涡流，测量具有突出到流动介质中的非流线体和涡流传感器的装置的流动来确定的方法，至少在一个或多个流体的质量流量比（x） 在测量管中流动两次或多相介质，并且具有以第一质量流率（点（m）} G流动的气态第一相和以第二质量流率（点）超过（m）流动的液体第二相） } L。 气相具有与液相的第二密度（r r）不同的第一密度（＆rgr; G），其包括：至少在涡流传感器的区域中在流动介质中产生Kármán涡流，借助于 虚张声势的身体，涡流从脱流体脱落，具有取决于流动介质的瞬时流速的涡流脱落频率（fv）; 通过涡流传感器记录由流动介质中的卡尔曼涡流引起的周期性压力波动，用于产生对应于压力波动的传感器信号; 从传感器信号中选择具有包含涡流脱落频率的频带，特别是窄频带的有用信号分量，特别是相对带宽小于瞬时涡流脱落频率的50％，其中优选地是瞬时涡流脱落 频率表示频率带宽的中心频率; 以及施加用于确定流动介质的质量流量比（x）的有用信号分量（M），其中质量流量比（x）被定义为第一质量流量（点（m）} G与 介质流动的总质量流量，特别是根据下式：x = m。 嗯。 L + m。 G。