Large-size composite material air inlet passage measuring rake

Abstract

The invention provides a large-size composite material air inlet passage measuring rake. Aims of integrated collection and measurement of measuring parameters of an engine inlet flow field, and simple and fast installation and disassembly are achieved under the demands that rake body weight is greatly reduced, and stiffness and vibration intensity of the measuring rake are met. The technical scheme includes that the large-size composite material air inlet passage measuring rake is characterized in that a skin framework with a U-shaped cross section comprises a front measuring section and a back installation section, the root portion of installation section of the skin framework is connected on an installation seat, a measuring point protective sleeve is arranged on the windward side of measuring section of the skin framework in an equal-ring-surface mode, a measuring element is installed in the measuring point protective sleeve and is outputted to the installation seat through a guide pipe, a damping protective sleeve with a U-shaped cross section is sleeved on the outer side of the skin framework, a gap is arranged between the damping protective sleeve and the skin framework, and the damping protective sleeve is connected on the installation seat.

Description

technical field [0001] The invention belongs to aviation auxiliary equipment, and relates to a measuring rake of a large-scale composite material air inlet. Background technique [0002] Due to the influence of many factors in flight, the quality of the flow field at the outlet of the inlet port deteriorates, the stability and performance of the engine work, and even lead to flight accidents such as engine surge and air parking. Therefore, in the flight test, it is necessary to develop and install an inlet measuring rake at the outlet of the inlet / engine inlet to measure and evaluate the quality of the flow field. [0003] At present, the structure design of small-sized aircraft air intake measuring rakes adopts an all-metal structure, the main material is stainless steel, and additional damping rings are added between each rake body (usually 6 or 8 equiangularly distributed in the circumferential direction). According to this structure design of large-size air inlet measur...

AI Technical Summary

Problems solved by technology

According to this structure design of large-size air inlet measuring rake, the design weight of a single rake body will reach 7.5 kg, which is more than twice the allowable weight of the engine test. At the same time, due to the ultra-long structure of the rake body, The inertial swing of the rake body increases the additional vibration and stress of the rake body, which will have a significant impact on the working safety of the rake body. In addition, due to the increased vibration stress of the rake body, the force of the rake body on the damping ring increases at the same time, and the damage of the damping ring It will be the biggest hidden danger of the test safety; due to the limitation of design technology, the existing measurement rake has a single measurement parameter, and cannot integrate and efficiently measure the temperature and pressure (steady state and dynamic) required for the quality evaluation of the inlet flow field, which increases the engine The development and installation quantity of the imported measuring head (measuring rake) increases the blockage ratio of the engine inlet airflow; due to the design of the existing installation, the refitting test of the rake body output pressure pipeline and weak current circuit is more cumbersome, which increases the intensity of refitting and time

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