On-line monitoring method of tightly sealed labyrinth gap and leakage flow

A technology for sealing the grate teeth and leakage flow, which is applied in the field of aero-engines, can solve the problems of not being able to obtain the cooling air volume of the hot-end components in real time, and can not perform real-time measurement, so as to save experiment costs, reduce measurements, and save experiment time.

Inactive Publication Date: 2020-01-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, we cannot measure the grate seal gap in real time during the operation of the aero-engine, so we cannot obtain the amount of cold air used to cool the hot-end components in real time

Method used

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  • On-line monitoring method of tightly sealed labyrinth gap and leakage flow
  • On-line monitoring method of tightly sealed labyrinth gap and leakage flow
  • On-line monitoring method of tightly sealed labyrinth gap and leakage flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Under the condition of fixing the structural parameters of the studied grate tooth, such as figure 2 As shown, the pressure measuring points are arranged in the 3 sections before the rotating grate to obtain the total pressure before the rotating grate, and because the speed of the 3 section is low, the static pressure of the 3 section is used instead of the total pressure, after the rotating grate 4 Pressure measuring points are arranged on the section to obtain the static pressure of the 4 sections to obtain the pressure ratio π of the rotating grate at different speeds. The total temperature of the inlet and outlet, so as to obtain the windage temperature rise ΔT of the rotating grate * .

[0071] In addition, the change of the rotating speed will change the working clearance of the rotating grate, which is mainly caused by the size change of both the ring casing and the rotating grate. A laser displacement sensor is placed at the position to monitor the dimension...

Embodiment 2

[0073] In the case of fixing the geometric parameters of the sealing grate, assuming the inlet and outlet pressure and temperature of the rotating grate, the corresponding sealing clearance c and leakage flow m of the rotating grate are obtained and compared with the experimental data, finally the rotating grate Deviation of sealing gap c and leakage flow m.

[0074] The geometric parameters of the sealed grate are: radius R=293.7mm, tooth height H=6mm, tooth pitch P=6mm, tooth top width t=0.45mm, forward inclination α=15°, back inclination β=30° .

[0075] Table 3 shows the deviation comparison between the experimental leakage flow rate and grate tooth sealing clearance and the calculated leakage flow rate and grate tooth sealing clearance under different working conditions. It can be seen from the table that the fitted flow coefficient and fitted dimensionless temperature ratio obtained by the estimation method have a small deviation from the experimental flow coefficient a...

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Abstract

The invention relates to an on-line monitoring method of a tightly sealed labyrinth gap and a leakage flow, which can carry out online real-time monitoring on the labyrinth tightly sealed gap and thelabyrinth leakage flow, and can adjust engine parameters in real time according to the monitored data, so as to improve the safety and reliability of the operation of an aviation engine and save aviation fuel consumption. The safety and reliability of the on-line monitoring method of the tightly sealed labyrinth gap and the leakage flow are mainly reflected in being able to solve the problems suchas the rotation-static friction caused by changes in gap during engine operation, the changes of the axial force caused by pressure changes, the invasion of gas in the radial direction, the oil leakage, and overheating of components due to reduced cool gas flow, which greatly improves the operation efficiency of the engine.

Description

technical field [0001] The invention belongs to the field of aero-engines, and relates to an on-line monitoring method for sealing grate tooth gaps and leakage flow, which is mainly used for online monitoring of sealing grate tooth gaps and leakage flow during the operation of aero-engines. Background technique [0002] As the "heart" of the aircraft, the aero engine plays an extremely important role in the performance of the aircraft. In order to improve the performance of the engine, such as thrust-to-weight ratio and fuel consumption rate. We usually do this by increasing the gas temperature before the turbine of the engine. However, as the temperature of the gas in front of the turbine increases, the hot end components such as the turbine disk and the turbine blades will bear a high heat load, which will seriously affect the service life and working performance of the engine. As a throttling element, the grate plays a very important role in the internal flow air system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/14G01M15/02G01B11/14G01F1/36
CPCG01B11/14G01F1/36G01M15/02G01M15/14
Inventor 刘高文聂顺鹏冯青屠杰李鹏飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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