Flow fixture for air cooling flow test on hollow blades

Abstract

The present invention discloses a flow fixture for the air cooling flow test on hollow blades, which comprises a fixture body with an opening on one side thereof. The fixture body is provided with a fixture inner cavity used for the levitation of a hollow blade and communicated with the outside through the opening, a seal gasket covered onto the outer surface of he hollow blade and closed inside the opening of the fixture inner cavity, and a fixture air inlet for being connected with a flow tester and feeding the cooling air into the fixture inner cavity. The tenon air inlet of the hollow blade and the lower margin plate of the hollow blade are positioned in the fixture inner cavity. The shrouded air outlet of the hollow blade is positioned inside the fixture inner cavity to be communicated with the outside, so that a flow channel for the cooling air is formed, wherein the cooling air flows into the flow channel through the fixture air inlet and flows out of the flow channel through the shrouded air outlet. In this way, the stability of measured results is ensured and the floating error of measured results on a single part during multiple tests is almost zero. Therefore, whether the blade is qualified or not can be quickly tested. The production and delivery period of the blade is shortened.

Description

technical field [0001] The invention relates to the technical field of turbofan engine turbine working blade detection, in particular to a flow fixture used for the air-cooled air flow test of a hollow blade. Background technique [0002] The working environment of a certain type of high-pressure turbine working blade is harsh, and it should have good thermal strength, fatigue resistance and creep performance. The blade adopts a hollow structure, that is, the cold air enters through the air inlet of the tenon teeth, and is discharged from the outlet of the blade tip through the inner cavity of the blade, so as to achieve the function of ventilation and cooling, and protect the blade. [0003] In order to ensure the cooling effect of the blades, before the high-pressure turbine blades are processed and put into storage, a single piece of air-cooled air flow test must be carried out according to the process data, that is, under the pressure of 0.08MPa, the measured flow rate i...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a flow fixture for the air-cooled air flow test of hollow blades to solve the problems of local flow limitation and air leakage in the existing old-fashioned flow test fixtures, poor sealing effect due to the inability to stably fix the blades, and poor sealing effect due to passing through bolts. Locking will easily lead to blade deformation or air leakage, which will easily lead to unstable test values. Repeated verification is required, resulting in technical problems that the blade has not been able to be submitted normally.

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