Experimentální zkoumání teplotního pole vodíkového firejetu

Abstract

This thesis deals with the design and assembly of an experimental apparatus serving as a hydrogen firejet source, as well as the design and assembly of an apparatus for measuring its temperature field. The proposed apparatus allows variation of the inlet flow rate in the range of 1–90 NL/min and the use of nozzles with internal diameters of 1, 2, and 3 mm. In the experimental part, a series of measurements was carried out in which the temperature field of the resulting hydrogen firejet was measured using thermocouples. To monitor the character of the flow, the Schlieren method was employed, for which an apparatus was also designed and assembled as part of this thesis. Another method used was thermal imaging with an infrared camera. The individual methods were evaluated, and the results obtained using thermocouples and the thermal camera were compared with the calculated firejet length. The thesis also assessed the influence of nozzle size and flow rate on the resulting firejet. It was found that, at the same flow rate, increasing the nozzle diameter reduces the jet momentum and causes the firejet to be oriented more upward. For the same nozzle, increasing the flow rate results in a longer firejet. A practical outcome of the thesis is a designed and verified experimental apparatus that can serve as a tool for measuring the temperature field of a hydrogen firejet.