THERMAL CHARACTERISTICS OF INCLINED WATER JET INTELLIGENT COOLING SYSTEM ON HOT TARGET

High-pressure water jet technology is currently highly significant in the automotive cleaning sector. Due to an inappropriate arrangement of nozzles on their spray rods, certain automated washers are unable to fulfil the washing requirements throughout the washing process. In this study, the internal and exterior flow field models of the nozzle are created using the computational fluid dynamics (CFD) theory. The flow field is simulated and examined using Fluent, and the external nozzle settings on the side spray bar of the automatic car washer are optimised. According to the modelling findings, when the nozzle and the normal line of the automotive surface are angled at a specific angle, the target surface is also subjected to tangential pushing force in addition to normal hitting force, which makes stains easier to remove. The nozzle should be angled away from the typical line of the automotive surface by 30° for the greatest washing results. The dynamic pressure on the surface of the car will rise as the nozzle inlet pressure rises, but after reaching a certain pressure, the rise in dynamic pressure will fall. The region covered by the water jet is mostly unaffected by the intake pressure. In addition to completely covering and cleaning the automobile surface, the reasonable matching results of jet angle, nozzle spacing, and nozzle distance from the automobile surface (target distance) obtained by numerical simulation can also ensure less jet interference and no water waste from nearby nozzles. The aforementioned study findings can serve as a fundamental theoretical foundation for the best automatic car washing design.