Method for improving heat exchange reinforcement effect of vortex generator by use of punching jet flow

Abstract

The invention discloses a method for improving the heat exchange reinforcement effect of a vortex generator by use of punching jet flow, belonging to the field of heat exchange reinforcing technology. A hole is formed in a proper position on the windward surface of a wing-type or column-type vortex generator, thus the fluid at the front part of the vortex generator passes through the hole and scours the flow dead area or weak heat transfer area of the leeward surface of the vortex generator, thus the average flow rate and kinetic energy of the area are improved, the weak heat transfer area is eliminated, and the effects of heat exchange reinforcement and flowing resistance reduction of the vortex generator as well as the efficiency of the heat exchanger are further improved; and meanwhile, since the area of the windward surface of the vortex generator and the range of the flowing separation area are reduced by punching, the form resistance of the vortex generator is reduced, thus the flowing loss is reduced. The method has the characteristics of convenience in processing, simple manufacturing and obvious effect, and has wide application prospects and popularization values in the aspect of reinforcement gas-side heat exchange of a gas-liquid or gas-gas heat exchanger.

Description

technical field [0001] The invention belongs to the technical field of enhanced heat exchange, and in particular relates to a method for improving the effect of enhanced heat exchange of a vortex generator by using a punching jet. Specifically, it punches holes at appropriate positions on the windward side of the vortex generator, guides the fluid on the windward side of the vortex generator to pass through the holes, and scours the stagnation zone (the flow dead zone, which is also a weak heat transfer zone) on the leeward side of the vortex generator, improving The average flow velocity and kinetic energy in this area eliminate the weak heat transfer area, further improving the heat transfer effect of the vortex generator and the efficiency of flow drag reduction; at the same time, the punching reduces the windward area of ​​the vortex generator, and the jet improves the fluid velocity on the leeward side And kinetic energy, narrowing the scope of the flow separation area, r...

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Problems solved by technology

Whether it is an airfoil or a cylindrical vortex generator, due to its blocking effect on the fluid, it also increases the flow resistance while enhancing heat transfer, and there is a small low-speed flow area at the tail (rear) part due to flow separation, and It is called the stagnant zone or flow dead zone. Due to the low flow rate and poor heat transfer effect, this zone belongs to the weak heat transfer zone, which has a negative impact on the enhanced heat transfer effect of the vortex generator.

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