SIMULATION OF SYSTEM FOR REPRODUCTION OF HIGH INTENSITY HEAT FLUX

Control of integral heat losses energy facilities during operation and fire tests are accompanied by an intensive heat transfer process in which the values of the surface heat flux reach about 200 kW/m2. Measurement of the heat flux is carried out using contact (heat flux sensors) and contactless (radiometers of measuring instruments) sensors, which must be calibrated in the appropriate range.  The aim of the article is to analyze the ways of forming the thermal radiation heat flux in the range of values (1∙-200) kW/m2 and to determine the factors influencing the accuracy of reproduction of the unit of measurement. The main factors are the uniformity of the thermal field formed in the plane of the receiving surface of the measuring instrument, and the contribution of the convective component to the resulting heat flux.The analysis of the heat field homogeneity on the heat sink surface was performed by computer simulation in the ANSYS package. In simulation studied the heat radiation intensity in a closed cavity at the variation of the distance between the heat radiation source and the heat sink surface at fixed cavity widths. For verification of the computer simulations results, experimental studies of the heat field distribution on the surface of the heat sink were performed using a multi-section heat flux sensor.