Simulation optimization design method for hot-blowing snow-removing exhaust device of turbofan engine

Abstract

The invention belongs to the technical field of simulation optimization of exhaust devices, and discloses a simulation optimization design method for a hot blowing snow removal exhaust device of a turbofan engine. Inlet and outlet boundary conditions of the exhaust device are determined based on the characteristics of the turbofan engine and a one-dimensional pipe flow theory; the current situation that a current hot blowing snow removal exhaust device is modified based the a turbojet engine is broken through, the inlet boundary condition of the exhaust device when an inner duct and an outer duct are mixed is accurately obtained, it is guaranteed that the exhaust device is in a critical or supercritical state, and the engine performance is fully utilized.

Description

technical field [0001] The invention belongs to the technical field of simulation optimization of exhaust devices, and in particular relates to a simulation optimization design method of thermal blowing and snow removal exhaust devices of turbofan engines. Background technique [0002] At present, the main method of quickly and timely removing snow on important and critical road surfaces (especially airport runways) is to use high-speed, high-temperature gas discharged from turbojet engines to blow off snow and thin ice on road surfaces. The specific implementation principle is: place the turbojet engine on the chassis of the truck, and drain the high-speed, high-temperature gas through a self-designed exhaust device, and spray the snow and thin ice on the road from the jet nozzle, which can be used The momentum characteristics of high-speed gas blow snow and thin ice away from the ground, and the temperature characteristics of high-temperature gas can also be used to melt s...

AI Technical Summary

Problems solved by technology

Therefore, the snow blowing and deicing device modified by the turbojet engine can basically meet the snow removal requirements of moderate to heavy snow in terms of function, but due to the small flow of the turbojet engine, it will be affected by the exhaust flow in the case of heavy snow. The limitation of snow removal results in low snow removal efficiency, which cannot meet the requirements of fast snow removal;

[0006]2. Exhaust device design method: conduct simulation optimization simulation for the size of exhaust velocity effective zone and exhaust velocity dead zone at the outlet of exhaust device, so as to optimize flow path The design of the cross-sectional area will lead to a better effect of the designed exhaust device on blowing snow, but due to the lack of consideration of the evolution process and spatial distribution of the exhaust temperature in the external flow field, it may occur when deicing the road surface The problem of the ice layer being difficult to melt effectively

At the same time, for asphalt ground, there may be a problem of road surface damage due to local excessive exhaust temperature;

[0007]3. Structural features of the exhaust device: the outlet section of the main nozzle and the opening nozzle is mostly designed with a circular section nozzle, and its biggest feature is that the structure is simple to manufacture , there is no need for a round-to-square transition section, but the effective exhaust width of the outlet is smaller, which reduces the snow blowing efficiency, causes some high-energy gas waste, and increases the cost of the jet snow removal vehicle

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