Струйно-вихревые рекуператоры для энергосберегающих технологий

Abstract

Рассмотрены перспективы применения струйно-вихревого рекуператора для повышения эффективности технологических агрегатов. Рассмотрен вопрос о нестабильности спиральных вихревых пространственных структур на основе теории вихрей и предложена физическая модель для имитационного физического моделирования с последующим СFD-моделированием работы рекуператора при различных температурах.

Розглянуто перспективи застосування струменево-вихрового рекуператора для підвищення ефективності технологічних агрегатів. Розглянуто питання про нестабільність спіральних вихрових просторових структур на основі теорії вихорів і запропонована фізична модель для імітаційного фізичного моделювання з подальшим СFD-моделюванням роботи рекуператора при різних температурах.

The paper considers the basic theoretical concepts of vortex motion in relation to the solution of technical problems. The issue of instability of spiral vortex spatial structures when doublet or triplet of vortex filaments occurs is considered on the basis of the vortex theory. The problem of current importance is investigation of existence parameters for swirl or spiral shape disturbances. The disturbances so called processes with precessing vortex core (spiral shape vortex). The assessment of heat engineering equipment, in particular, recuperative heat exchangers is conducted. It is displayed that heating engineering units – vortex devices such as vortex combustor, combustion chambers etc. – have considerable advantages due to the operation in the active hydro–gasdynamic modes, and efficiency of their work is mainly depends on the operating and design parameters. The vortex effect that occurs in these devices allows making them compact, with an increased energy efficiency ratio, which corresponds to the objectives set in the Energy Strategy of Ukraine 2030. A construction of the jet-vortex compact recuperative heat exchanger, the operation features of which are in good agreement with the theory of the concentrated vortices, is given. It is displayed that the work of the jet-vortex recuperative heat exchanger is not completely identical to the cyclone vortex heat exchangers by the nature of the processes occurring there. The process of making decisions on the design parameters of a physical model (a cold aerodynamic experimental unit), its aerodynamic calculations and the selection of parameters for CFD-simulation of jet-vortex recuperative heat exchanger is considered. A technique for research on a physical model and its design is represented. The operation of the experimental unit is described. According to the results of CFD-research for recuperator operation, the high adequacy of the numerical CFD-model developed on the basis of the physical and simulation modeling results is presented.