A Test Bench for Measuring Small Hole Discharge Coefficient under Rotating Condition

Abstract

The invention discloses a test stand for measuring a flow coefficient of a small hole under a rotation condition. The test stand comprises an air inlet section, a mixing section, an expansion section, a stabilizing section, a testing section, a main shaft and a driving motor thereof, wherein the air inlet section is in a double-pipe air inlet mode; the testing section comprises an inlet straight pipe, a labyrinth seal member, a cylindrical box, an axial small hole flow coefficient rotating disc or a radial small hole flow coefficient rotating disc, wherein the axial small hole flow coefficient rotating disc and the radial small hole flow coefficient rotating disc are positioned and arranged at different positions of the main shaft; an outlet end of the box is provided with a rear cover plate; the rear cover plate is provided with a main shaft hole and an outflow hole; the cylindrical surface of the box is provided with a hatch and a hatch cover which is movably fixed; the axial small hole flow coefficient rotating disc and the radial small hole flow coefficient rotating disc are provided with experimental element mounting holes respectively; accurate measurement of leakage and flow can be realized by replacing non-porous experimental members or experimental members of different hole types.

Description

technical field [0001] The invention relates to a test bench for measuring the flow coefficient of a small hole under a rotating condition, which is specially used for measuring the flow coefficient of a small hole under a rotating condition, and belongs to an experimental device for the flow coefficient of a hole structure in an air system of an aeroengine. Background technique [0002] Measuring the pore flow coefficient is a problem often encountered in engineering applications. At present, engineering design mainly refers to the "Handbook of Using Fluid Resistance", but the manual gives approximate formulas for the flow coefficient of the pore structure under static conditions. The measurement of the small hole flow coefficient has little reference value, and the air system of the aero-engine currently contains a large number of pore structures, so it is necessary to measure the flow coefficient of the pore structure under the rotating condition to provide a design basis ...

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Problems solved by technology

[0002] Measuring the pore flow coefficient is a problem often encountered in engineering applications. At present, engineering design mainly refers to the "Handbook of Using Fluid Resistance", but the manual gives approximate formulas for the flow coefficient of the pore structure under static conditions. The measurement of the flow coefficient of small holes has little reference value, and the air system of the aero-engine currently contains a large number of pore structures, so it is necessary to measure the flow coefficient of the pore structure under the rotating condition to provide a design basis for the air system of the aero-engine

Regarding the measuring device for the discharge coefficient of the pore structure under rotating conditions, the test device adopted by Idirs et al. in foreign countries requires dismantling the casing and the inlet section during the replacement of the test piece, so it is impossible to ensure that the gap between the grate teeth and the rotating disk is consistent for each test. , that is, the leakage through the gap between the grate teeth and the rotating disc will change during each test, and the online measurement of the leakage cannot be realized, which eventually makes the experimental results have large errors and fails to achieve the purpose of accurately measuring the flow coefficient of the rotating small hole

However, there is no special measuring device for small hole flow coefficient under rotating conditions in China.

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