Columnar vortex-induced velocity measuring and vibration measuring sensor
A sensor and speed measurement technology, applied in the field of sensors, can solve the problems of not being able to meet the installation requirements of external sensors, affecting vibration response, and disturbing the external flow field of heat exchange tubes, etc.
Active Publication Date: 2019-06-18
BEIJING INST OF STRUCTURE & ENVIRONMENT ENG
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Problems solved by technology
On the one hand, the way of installing sensors outside the heat exchange tubes will interfere with the external flow field of the heat exchange tubes, forming additional fluid excitation to generate "false" vibration excitation; on the other hand, the sensor installed outside the heat exchange tubes is Additional mass, which affects the natural frequency of the tubes and thus the true vibration response
In addition, many inner layer heat exchange tubes cannot be tested for flow-induced vibration because they cannot meet the installation requirements of external sensors
Method used
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[0026] see Figure 1-3 , a columnar vortex-induced velocity measurement and vibration measurement sensor of the present invention, the two ends of the cylinder 1 have connectors 12 for connection; the outer wall of the cylinder 1 is provided with three rows of velocity measurement and static pressure holes 2 along the central axis of the cylinder 1, and the velocity measurement The holes of the static pressure holes 2 are distributed along the radial direction of the cylinder 1; the first row of speed measuring static pressure holes 2A is located at the front stagnation point, the holes of the second row of speed measuring static pressure holes 2A and the third row of speed measuring static pressure holes 2C They are respectively set at an angle of ±45° with the first row of speed measuring and static pressure holes 2A; the three rows of speed measuring and static pressure holes 2 are respectively connected to the corresponding speed measuring and equalizing chambers 8, and the...
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The invention provides a columnar vortex-induced velocity measuring and vibration measuring sensor for a heat exchange tube. Two ends of a columnar body are provided with connection heads for connection; three rows of velocity measuring static pressure holes distributed along the central axis of the columnar body are formed in the outer wall of the columnar body; two rows of vibration measuring main sensing pressure holes distributed along the along the central axis of the columnar body and two rows of vibration measuring auxiliary sensing pressure holes distributed along the along the centralaxis of the columnar body are formed in the outer wall of the columnar body, + / -85-degree angles being formed between the two rows of vibration measuring main sensing pressure holes and the first rowof velocity measuring static pressure holes, and + / -115-degree angles being formed between the two rows of vibration measuring auxiliary sensing pressure holes and the first row of velocity measuringstatic pressure holes; after being assembled, the sensor forms a part of the heat exchange tube without causing additional disturbance to a surrounding flow field, and can truly measure a vortex-induced frequency as well as the velocity and direction angle of local incoming flow when a fluid washes the heat exchange tube.
Description
technical field [0001] The invention relates to a columnar vortex-induced speed-measuring and vibration-measuring sensor, which belongs to the field of sensors. Background technique [0002] The shell-and-tube heat exchanger has the advantages of simple structure, large heat transfer surface, high pressure and high temperature resistance, convenient operation and management, etc. It has high reliability and wide adaptability. be widely applied. The heat transfer tube in the shell-and-tube heat exchanger is in the environment of the primary side coolant and the secondary side steam-water mixture for a long time, and at the same time as the pressure boundary of the primary circuit coolant, there is a risk of vibration and wear failure caused by flow-induced vibration. In recent years, with the increase of the fluid flow rate inside the shell-and-tube heat exchanger and the increase in the flexibility of the heat exchange tube caused by the increase in the size of the heat exc...
Claims
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Login to View More IPC IPC(8): G01P3/12G01H13/00
Inventor 马平昌李红张良林淡李亚男刘德军赵威
Owner BEIJING INST OF STRUCTURE & ENVIRONMENT ENG