Method and device for on-line measurement of blade tip clearance based on blade tip timing technology
A technology of blade tip clearance and blade tip timing, applied in measurement devices, optical devices, instruments, etc., can solve the problems of complex probe structure, limited portability, low reliability, etc., to achieve low cost and improve measurement reliability. , the effect of improving the measurement accuracy
Active Publication Date: 2021-12-24
SHANGHAI JIAOTONG UNIV +1
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The disadvantages of this type of method are: multiple points need to be calibrated to complete the measurement, and it is greatly affected by the geometry of the blade tip to be tested, the nature of the working fluid of the turbine, etc., the reliability of long-term work is low, and the portability is limited.
The probe structure of this method is complex, the size is large, and the photoelectric signal of two channels is required for detection
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0053] According to the present invention, an online blade tip clearance measurement device based on blade tip timing technology includes: casing 3, lens 4, optical fiber probe 5, bundled optical fiber 6, control and acquisition circuit 9, and host computer 10;
[0054] One end of the optical fiber probe 5 is provided with the casing 4; the casing 4 is opened with the center of the optical fiber probe as the center of a circle; the other end of the optical fiber probe 5 is fixed to the outlet end of the bundled optical fiber 6; The other end of the bundled optical fiber 6 is connected to the control and acquisition circuit 9; the control and acquisition circuit 9 is connected to the host computer 10; After the modulo laser passes through the lens 4, it can form a cone-shaped beam and irradiate the tested blade 1 through the casing 4;
[0055] The bundled optical fiber 6 includes a transmitting optical fiber 7 and a receiving optical fiber 8 ; the transmitting optical fiber 7 a...
Embodiment 2
[0082] Embodiment 2 is a modification of embodiment 1
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a blade tip clearance on-line measurement device and method based on blade tip timing technology, comprising: a casing is provided at one end of the fiber optic probe; the casing is opened with the center of the fiber optic probe as the center; The outlet end of the optical fiber is fixed; the other end of the bundled fiber is connected to the control and acquisition circuit; the control and acquisition circuit is connected to the host computer; the lens is set in the fiber optic probe, so that the single-mode laser emitted by the emitting fiber can form a cone-shaped beam after passing through the lens. The casing is irradiated on the impeller; the bundled optical fiber includes a transmitting optical fiber and a receiving optical fiber; the transmitting optical fiber and the receiving optical fiber are respectively connected with control and acquisition circuits. The invention detects the blade by using a conical laser, and calculates the size of the blade tip clearance in combination with the rotating speed and the radius of the blade.
Description
technical field [0001] The present invention relates to the field of blade tip clearance measurement, in particular to a blade tip clearance online measurement method and device based on blade tip timing technology. Background technique [0002] Blade tip clearance is the radial distance between the rotor blade tip and the casing. Tip clearance is an important design parameter for turbomachinery. If the blade tip clearance is too small, it will cause friction between the blade and the casing, resulting in potential safety hazards and equipment failure. Therefore, the on-line measurement technology of blade tip clearance can improve the operation efficiency of turbomachinery and reduce the operation risk. The prior art falls into several categories. [0003] One is to measure by capacitive sensors (for example, Chen Hongmin, University of Electronic Science and Technology of China's 2009 master's thesis "Application Research of Capacitive Gap Measurement System in Turbine"...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/14
CPCG01B11/14
Inventor 肖志成吴亚东蒙一鸣田杰李健萍欧阳华
Owner SHANGHAI JIAOTONG UNIV