Heat exchange test device based on mixed gas adjustment and test method thereof

The invention provides a fuel irradiation test device based on mixed gas adjustment and a test method thereof, and belongs to the technical field of reactor irradiation tests. The problem that an existing fuel irradiation device based on mixed gas adjustment cannot well verify the influence on heat transfer under various conditions such as different gas components, different air gap thicknesses and different heating powers is solved. The device comprises an electric heater, an inner sleeve, an outer sleeve and an electric heater joint, an air gap layer is arranged between the electric heater and the inner sleeve, the air gap layer is connected with an air adjusting system through an air inlet section pipe joint and an air outlet section pipe joint of an end flange, and a cooling water layer is arranged between the inner sleeve and the outer sleeve. The output end and the input end of the cooling water layer are connected with a cooling water system through a cooling water inlet pipe connector and a cooling wa