During the outflow of the bulk material from the hopper, the particles interact with each other, the walls of hopper, forming a so-called arches. Arching is a common phenomenon at the end of bulk materials. A large number of authors fight against arches, a lot of theories and models were designed. The use of arch destroyers is the most effective way to combat by arching process. The parameters of such devices are calculated on existing methods, where the frequency and impact on the bulk material is selected. Constructions for arch destroying are a large number, but each is present lack of expressed in constant maintenance and outer energy consumption. Therefore, an optimization of the hopper parameters, under arch creating conditions, at the design stage, is an urgent task for the theoretical description. In the analysis of the hopper with a side outlet, it was established, that the arches are formed in the least section, during the movement of bulk material. Such a section is called arch-making section. If arch-making section is too small, relative to the diameter of the bulk material, a static arch will formed, and the outflow will be terminated. To continue outflow can be only if you deduced an arch from the equilibrium state by external forces. This paper proposes a curved profile of the bottom profile so as to increase the height of arch-making section, retaining a predetermined pitch, thereby reducing the impact of the arch, keeping the specified feed of grain material. It was revealed that due to the new profile of the bottom at the lowest feeds of bulk material, more stable expiration is observed.
Study on the Measurement Technology of Temperature Field at the Outlet of the Precooler in the Bleed air system of Civil Aircraft
