A double-flow path nozzle experimental pipeline with circumferential air intake

Abstract

The invention provides a circumferential air intake dual-flow-path spray pipe experiment pipeline, and belongs to the field of turbofan engine spray pipe experiment test devices. The dual-flow-path spray pipe experiment pipeline comprises a primary flow air intake segment, a pressure stabilizing segment, a primary / secondary flow mixing segment and an experiment spray pipe which are connected coaxially in sequence, wherein the primary flow air intake segment is provided with two primary flow air intake channels and one primary flow mixing chamber outlet; the primary / secondary flow mixing segment is also provided with eight secondary flow air intake channels which are connected with a secondary flow air source; and primary flow and secondary flow are mixed at the outlet of the primary / secondary flow mixing segment, and flow into the experiment spray pipe. Through the adoption of the dual-flow-path spray pipe experiment pipeline, the working state of a dual-duct spray pipe can be simulated through a primary flow path and a secondary flow path, and circumferential air intake structures are adopted for the primary flow and the secondary flow, so that the generation of axial force duringventilation of circumferential air intake is avoided, and the spray pipe thrust measuring error caused by the air intake axial force can be eliminated in the spray pipe experiment process. Moreover,the primary / secondary flow mixing segment designed according to the patent parameters can improve the uniformity of the secondary flow, so that the experiment error caused by non-uniform secondary flow is reduced greatly.

Description

technical field [0001] The invention belongs to the field of turbofan engine nozzle experiment testing devices, and in particular relates to a circumferential air-intake dual-flow path nozzle experiment pipeline. Background technique [0002] The dual-duct nozzle is the main component of the exhaust system of the turbofan engine. Before the nozzle is applied to the turbofan engine, it is necessary to verify the performance of the nozzle through a scaled nozzle experiment. In the experiment, the measurement of the thrust performance of the nozzle is indispensable; in addition, from the perspective of scientific research, the nozzle Experiments can be used to study the flow characteristics of different types of nozzles and verify the numerical simulation results. Therefore, the nozzle experiment is an indispensable part of scientific research. [0003] In 2019, Vol. 34, No. 7, "Journal of Aerodynamics", pages 1493-1500, the infrared radiation characteristics experiment of th...

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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a dual-flow path nozzle experimental pipeline with circumferential air intake, which adopts the main flow air inlet channel and the secondary flow air intake channel of the circumferential air intake to solve the problem of the existing dual-flow path nozzle experiment. In the pipeline, the problem of nozzle thrust measurement error caused by axial air intake force

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