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A device for measuring the flow coefficient of an axially rotating hole and the non-rotating method

A technology of axial rotation and flow coefficient, applied in the direction of measuring devices, engine testing, mechanical parts testing, etc., can solve the problems of high cost, low accuracy, difficult measurement, etc., achieve high accuracy and reduce experiment cost , the effect of improving safety

Inactive Publication Date: 2018-06-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is: in order to overcome the problems of low accuracy, difficult measurement and high cost of the existing measurement methods, the present invention proposes a non-rotating method for measuring the flow coefficient of axially rotating holes

Method used

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  • A device for measuring the flow coefficient of an axially rotating hole and the non-rotating method
  • A device for measuring the flow coefficient of an axially rotating hole and the non-rotating method
  • A device for measuring the flow coefficient of an axially rotating hole and the non-rotating method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] combined with figure 1 , the axial rotation hole 1 is located on the rotating part, and rotates around the rotation axis at the same rotation speed U as the second outer ring body 2, and the airflow enters the axial rotation hole 1 at an absolute intake angle θ, while the actual feeling of the axial rotation hole is to the relative intake angle θ r , the relative intake angle can be determined by the following formula:

[0050]

[0051] The absolute intake angle is converted into a relative intake angle by the above formula.

[0052] combined with figure 2 , change the axial rotation hole 1 into a static hole, and do not give the rotational speed U. Against the flow direction, set the pre-swirl nozzle 3 in front of the axial rotation hole 1, so that the air flow passes through the pre-swirl nozzle and then enters the axial rotation hole. The pre-swirl angle is given according to the air flow relative to the intake angle:

[0053] θ 0 =90°-θ r

[0054] combine...

Embodiment 2

[0068] Under the same structural parameters of the rotating hole, compare the deviation of the flow coefficient between the non-rotating method and the actual rotating condition: the structural parameters of the axial rotating hole are: hole radius position R=170.7, hole length L=10mm, hole diameter D=6.5 mm, and the number of complete rings of axially rotating holes is N=60. The pre-rotating nozzle has the same radial position as the axially rotating hole, the number of full rings is the same, the outlet cross-sectional area is the same as the hole cross-sectional area, and the pre-rotating angle is determined by the relative inlet angle.

[0069] The following table shows the experimental working conditions of the non-rotating method, and the comparison between the flow coefficient obtained by the non-rotating method and the actual flow coefficient under different relative intake angles is obtained through CFD numerical simulation. It can be seen from the table that the maxi...

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Abstract

The invention provides a non-rotation method for measuring the flow coefficient of an axial rotating hole, which comprises the steps that firstly, an absolute air inlet angle of an air inlet flow is converted into a relative air inlet angle, and the axial rotating hole is converted into a static hole; secondly, a pre-whirl nozzle is arranged in front of the axial rotating hole, the pre-whirl angle is given according to the relative air inlet angle of the air flow, and the air flow is enabled to be pre-whirled by the pre-whirl nozzle and then gets into the axial rotating hole; and finally, a thermocouple is adhered to an inlet of the pre-whirl nozzle, a compensating lead is led to an acquisition board card so as to measure the absolute total temperature of the inlet of the pre-whirl nozzle; a static pressure measurement point is connected to a pressure measurement instrument such as a differential pressure gauge through a pressure leading pipe so as to measure static pressure at an outlet of the pre-whirl nozzle and an outlet of the axial rotating hole; and thus the ideal flow is acquired through a calculation formula for the ideal flow, the flow passing through the hole is measured through a flowmeter, and the actual flow passing through the hole is acquired, so that the flow coefficient is acquired.

Description

technical field [0001] The invention relates to the field of aero-engine air systems, in particular to a device and a non-rotating method for measuring the flow coefficient of an axially rotating hole. Background technique [0002] At present, the increase of the thrust-to-weight ratio of the aero-engine means that the gas temperature before the turbine inlet needs to be increased accordingly, and the thrust of the engine can be increased by about 10% for every 55°C increase. The temperature in front of the turbine of modern aero-engines has reached 2000K, which is much higher than the upper limit of the engine's metal materials. It is difficult to improve the performance of the engine simply by increasing the temperature limit of the metal materials. It is more necessary to extract air from the compressor and pass it through the The flow air system effectively cools the high temperature components. [0003] In a modern turbojet engine, the gas flow in the air system accoun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01M15/00G01D21/02
CPCG01D21/02G01M13/00G01M15/00
Inventor 刘高文牛嘉嘉李伯孙科叶丹吴衡刘育心冯磊
Owner NORTHWESTERN POLYTECHNICAL UNIV