OVERVIEW OF THE PROJECT
RVBF is an Inert gas-circulated, closed-loop Integrated thermal system with operating temperatures up to 1500 Deg Celsius. The Integrated thermal loop consists of a heat treatment chamber, a centrifugal blower for gas circulation, Shell and Tube Heat exchanger to achieve gas cooling, and an Electromagnetic Induction heater to reach a higher operating temperature. Controlled cooling of the job is essential to achieve the desired metallurgical structure after heat treatment. Niharika Computational Engineering Solutions Pvt Ltd (NCES) has collaborated with the client and analyzed the overall thermal performance of RVBF. We conducted transient Computational Fluid Dynamics (CFD) analysis to analyze the cooling of the job during the cooling cycle. Our CFD analysis process is validated with the help of experimental data obtained from the existing RVBF unit, which is of slightly lower capacity.
The Rotary Vacuum Brazing Furnace (RVBF) is a high-temperature thermal system utilized by aerospace manufacturers for brazing and various metallurgical processes within a chemically inert environment. This closed-loop RVBF features a heat treatment chamber that includes induction heaters, a shell and tube heat exchanger, and a blower to facilitate the circulation of inert gas. The purpose of performing CFD analysis is to assess the effectiveness of the induction heater design and evaluate the performance of the cooling systems in use.
The CFD mesh is composed of 20 million Poly hex core elements that meet the necessary quality metrics in accordance with CFD best practices. Fine elements are utilized in areas with high gradients, such as around the blower blades and heaters.
Both steady-state and transient CFD analyses have been performed on the RVBF unit to thoroughly evaluate the various assumptions made during the design process.
The steady-state analysis confirmed that the induction heater design, along with integrated cooling systems such as the shell and tube heat exchanger and blower, is adequate. Meanwhile, the transient CFD analysis provided our client with the assurance that specific operational requirements, particularly the time-dependent cooling of the job following a hot soak, are met.
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