Experimental studies and verification of the radiative model of the infrared irradiator IET-29 based on the results of its thermal vacuum tests


Аuthors

Ulyanov V. A.*, Polyakhov A. D.**, Savchuk P. N.

Federal State Enterprise "Research and Testing Center for the Rocket and Space Industry", Peresvet, Russian Federation

*e-mail: osduka@rambler.ru
**e-mail: alekdmitrpol@gmail.com

Abstract

A technique has been developed and verification of the radiative model of the IET-29 irradiator has been carried out, on the basis of which the infrared radiation simulator of the VK600/300 thermal vacuum chamber of the Federal State Enterprise “Research Center of the Russian Communist Party” has been built.
The height of the suspension of the radiating element above the reflector protrusion determined by the results of thermal vacuum tests of the infrared radiation simulator of the VK600/300 thermal vacuum chamber and equal to about 13 mm best ensures the reproduction of the actual spatial distribution of the radiant flux from the irradiator.
The maximum average mismatch of the calculated model and experimental data is within 5 %, which allows us to conclude that the constructed radiative model of the IET-29 irradiator is adequate.
The design power dissipated by the radiating element at the power supplied to the irradiator at 1634 W is in the range of 1200 W ÷ 1300 W, which corresponds to the results of thermal simulation of the IET-29 irradiator.
The mutual angular mismatch of the irradiator No 33 and the reference plane determined by the surface of the receiving platforms of the radiant flux sensors relative to the nominal position was approximately 2 degrees.
The efficiency of the IET-29 irradiator was approximately 76,4 %, which practically coincides with the efficiency value obtained from the results of thermal modeling of the irradiator, which is 74,7 %. 
The illumination zone of the irradiator is within the boundaries of ±1060 mm along the main transverse plane and ±2020 mm along the main longitudinal plane.
It is shown that even a slight discrepancy between the specified and actual angular positions of the rotary support device relative to the involved simulator struts can lead to an insufficiently accurate reproduction of the thermal load specified in the program and method of thermal vacuum tests.
The constructed and verified thermal and radiative models of the irradiator make it possible to solve methodological issues of simulating the external heat load at the stages of developing programs and methods for thermal vacuum testing of products, conducting technological modes for adjusting the si-mulator to the test object, adjusting the simulator operating modes during testing, as well as during the analysis of their results.

Keywords:

infrared radiation simulator, irradiator, emitting element, reflector, radiative model, spatial distribution of radiant fluxes, thermal vacuum tests

References

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