Aviation turbojet engine wake flow field test device

Abstract

The invention provides an aviation turbojet engine wake flow field test device. The device comprises a combined measurement rake, a measurement rake mounting rack and a mounting rack fixation device.The combined measurement rake is provided with a temperature measurement probe and a pressure measurement probe. The combined measurement rake is fixedly mounted on the measurement rake mounting rackthrough a pulley; and by moving the pulley left and right, flow field distribution on a vertical airflow surface can be obtained. The measurement rake mounting rack is connected to a ground anchor through long and short steel ropes; and by moving the measurement rake mounting rack in the wake flow direction, flow field distribution of the engine wake flow on different cross sections can be obtained. The device provides a new solution for the turbojet engine wake flow field test, effectively improves measurement precision of a temperature field, a pressure field and a velocity field, and provides technical support for accurately analyzing the infrared irradiation characteristics of the engine.

Description

technical field [0001] The invention relates to an infrared test technology, in particular to a wake field test device for an aviation turbojet engine infrared radiation characteristic test. Background technique [0002] Since 1987, my country promulgated GJB241-87, which stipulates that the newly developed turbojet engine must be tested for infrared radiation characteristics for military aviation turbojet engines. The exhaust wake of a large turbojet engine has the characteristics of high speed, high temperature, and a large flow field range. The measurement device needs to bear a large aerodynamic load and thermal load when placed in the flow field. [0003] At present, when carrying out the infrared radiation characteristic test of turbojet engine exhaust wake, generally adopt the mesh rectangular grid measuring rake, including the pressure measuring rake and the temperature measuring rake, the pressure measuring probe and the temperature measuring probe are respectively ...

AI Technical Summary

Problems solved by technology

[0003] At present, when carrying out the infrared radiation characteristic test of turbojet engine exhaust wake, generally adopt the mesh rectangular grid measuring rake, including the pressure measuring rake and the temperature measuring rake, the pressure measuring probe and the temperature measuring probe are respectively fixed on the mesh rectangular grid. On the grid, due to the large number of mesh rectangular grids (many measuring rakes), this method occupies a large area of ​​the flow field, and the measuring rakes have a significant blocking effect on the airflow, which affects the measurement accuracy; and in order to withstand a large aerodynamic load, the support The volume of the structure is also very large, which further increases the blocking effect on the airflow

[0004] At present, there is no special experimental test equipment, special test site and corresponding experimental test technology for engine infrared radiation characteristics in China. Look, no systematic results have been formed yet, and the technology maturity is also low. Most of the calculation models lack the verification of actual engine measurement data. There are some differences between the models and the actual situation, and the reliability of the calculation results is not high.

These factors have affected the development and correction of domestic infrared radiation calculation models and software, and severely restricted the development of infrared stealth technology for military aero-engines

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