A composite functional acoustic test piece

Abstract

The invention provides a multifunctional acoustic testing part. The testing part comprises a separator (1), an acoustic cavity ring (2), a body section (3) and a blanking cap (4), wherein the body section (3) comprises a straight tube section and a convergent section; the acoustic cavity ring (2) has an annular structure formed by inner and outer cylinders, one end of the acoustic cavity ring is closed to form a cavity inside the annular structure, and the outer cylinder is connected with the straight tube section of the body section (3); a circumferential separator (6) is of a cylindrical shape, and one end of the circumferential separator (6) is fixed in the middle of a bottom plate (5); radial separators (7) are circumferentially distributed along the circumferential separator (6), and are arranged between the circumferential separator (6) and the body section (3); the bottom plate (5) is arranged in the inner cylinder of the acoustic cavity ring (2) through a marginal positioning slot; and the blanking cap (4) is arranged at the convergent end of the body part (3). The invention aims at studying the acoustic characteristics of a combustion chamber under disposition of different stabilizing devices of separator and acoustic cavity, so that the stability design margin of the testing part can be improved, the number of testing parts can be reduced, and the production cycle and cost can be reduced.

Description

technical field [0001] The invention relates to an acoustic test piece. Background technique [0002] Simulated acoustic tests play a very important role in studying the mechanism of high-frequency combustion instability in rocket engine combustion chambers, establishing physical and mathematical models, optimizing the design of combustion chambers and main components, and improving engine stability design margins. [0003] That is, through the acoustic test of the combustion chamber, the natural frequency of the combustion chamber can be known; at the same time, the ability of different structural stabilization devices (acoustic cavity and partition) to suppress the disturbance in the combustion chamber can be obtained, so as to determine the structural form and size of the full-scale combustion chamber stabilization device. On the basis of ensuring the same acoustic characteristics as the actual product, the structure and assembly of the acoustic test piece should be as si...

AI Technical Summary

Problems solved by technology

At present, there are relatively few test pieces for acoustic tests on combustion chambers, and the production cycle is long and the cost is high

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