Hyperbolic cosine slit sensor for measuring water film thickness and design method of grid isolator

A hyperbolic cosine, water film thickness technology, applied in the field of testing, can solve the problems of steam turbine blade erosion and impact, steam turbine thermal efficiency reduction, blade roughness, etc., to achieve good electromagnetic performance and radiation performance, good flow characteristics, and low environmental requirements Effect

Pending Publication Date: 2019-03-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The steam humidity directly affects the safety and economy of steam turbine operation. On the one hand, the increase of steam humidity will cause strong erosion and impact on the turbine blades, making the blades rough, pits appear, and even cause the blades to twist and break, seriously threatening The safe operation of the steam turbine; at the same time, the thermal efficiency of the steam turbine will be reduced

Method used

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  • Hyperbolic cosine slit sensor for measuring water film thickness and design method of grid isolator
  • Hyperbolic cosine slit sensor for measuring water film thickness and design method of grid isolator
  • Hyperbolic cosine slit sensor for measuring water film thickness and design method of grid isolator

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Effect test

Embodiment 1

[0033] A hyperbolic cosine gap sensor for measuring water film thickness, comprising a resonant cavity main body 3, a wedge-shaped cylinder 1 at the left end, and a wedge-shaped cylinder 6 at the right end; The right grid isolator 5 is composed, the left and right ends of the resonant cavity 3-1 are respectively connected to the left grid isolator 2 and the right grid isolator 5, and the left grid isolator 2 and the right grid isolator 5 have the same structure, Both are composed of 9 metal strips; the middle metal strip of the 9 metal strips is linear, and the other 8 hyperbolic cosine-shaped metal strips are symmetrically distributed with respect to the middle metal strip; the left end of the left isolator 2 and the left wedge-shaped cylinder 1 The right end communicates with the wedge-shaped cylinder 6 at the right end; the side wall of the resonance cavity main body 3 is provided with a coupling installation hole 4 .

[0034] The grid spacer at the left end (2) and the gri...

Embodiment 2

[0058] A method for designing the grid isolator in the hyperbolic cosine gap sensor for measuring water film thickness described in Design Example 1, the design method of the grid isolator 2 at the left end and the grid isolator 5 at the right end are the same, and the grid isolator at the left end is isolated Device 2 includes the following specific steps:

[0059] Step 1: Calculate the direction of the current density at the end face of the resonator: set the x-axis through the center point of the grid isolator at the left end and coincide with the direction of the middle metal strip, and set the y-axis to be orthogonal to the x-axis; J r is the radial component of the current density at the end face of the resonator, is the tangential component of the current density at the end face of the resonant cavity, J is the current density at the end face of the resonant cavity; the current density J at the end face of the resonant cavity and the radial component J of the current d...

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Abstract

The invention discloses a hyperbolic cosine slit sensor for measuring water film thickness and a design method of a grid isolator, wherein the hyperbolic cosine slit sensor includes a cylindrical cavity with two end openings and a microwave signal transmission interface in the middle, two inner ends of the cylindrical cavity are separately provided with a grid isolator. The grid isolator is composed of an intermediate linear metal strip and more than a pair of hyperbolic cosine metal strips symmetrically distributed with respect to the intermediate linear metal strip, and ends of the hyperbolic cosine metal strips which are near an end opening of the cylindrical cavity are connected to the cylindrical cavity. The invention can cooperate with a microwave signal processing circuit to realizemicrowave measurement of the water film and liquid film thickness of the inner surface of a cylindrical metal. The invention has the advantages of simple structure, convenient use, low environmentalrequirement and high measurement precision. The grid isolator structure has large slits to ensure good flow characteristics and accurate sampling. Meanwhile, opening along a current density directionof a resonant cavity end face ensures good electromagnetic performance and radiation performance.

Description

technical field [0001] The invention relates to a design method of a resonant cavity sensor and a grid isolator for measuring the thickness of a water film, in particular to a design method of a hyperbolic cosine gap sensor and a grid isolator for measuring the thickness of a water film, and belongs to the technical field of testing. Background technique [0002] The last stages of large condensing steam turbines in conventional power plants and all stages of turbines in nuclear power plants operate under wet steam conditions. The steam humidity directly affects the safety and economy of steam turbine operation. On the one hand, the increase of steam humidity will cause strong erosion and impact on the turbine blades, making the blades rough, pitted, and even twisted and broken, which seriously threatens The safe operation of the steam turbine; at the same time, the thermal efficiency of the steam turbine will be reduced. In geothermal power plants and nuclear power plants,...

Claims

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Application Information

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IPC IPC(8): G01B15/02
CPCG01B15/02
Inventor 张淑娥喻星源杨再旺张京席宋文妙范寒柏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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