Underwater Model Performance Analysis Of Air-water Engine Compressor

The aircraft can fly in the air must rely on the power unit.Now,all the aircraft are equipped with engine that they need.The performance of the engine directly determines the overall performance of the aircraft.With the continuous development of the aircraft,the aircraft not only to be able to fly in the air,but also need more function.Countries are also looking for more functional aircraft,in particular,the aircraft that can fly in the air and dive into the water.The aircraft need to fly in the air and swim in the water.In order to achieve the water and air dual-use performance of the aircraft,so it need to explore a suitable air-water engine that can use both in the air and water.According to this requirement,this paper presents a new engine,The engine based on the current turbofan engine and make appropriate improvements.It combined the turbofan engine with the water ramjet engine,the operating principle of the engines use different model in different environments.For the simplicity of the engine structure,it is necessary to make the engine compressor can work in both air and water.So the compressor can compress air and pump water.The combustion chamber section can use the current study of water-air engine combustion chamber design.When the engine flight in the air is similar to a normal engine,it rely on aviation fuel combustion to generate thrust.When diving into the water,it using the carrying water reaction metal and water to produce high temperature and high pressure gas to produce thrust.For the water-air engine needs to work both in water and air environmental conditions,and the compressor need to compress air and pump water,so change the existed air compressor work model,then it can studied and analyzed the performance of the compressor in the underwater propulsion mode of the water-air engine.The commercial CFD software and the numerical simulation was used to analyze the existing air compressor directly under the water environment.Finally,analyse the results and the flow field to study the performance of the engine compressor in the underwater environment.The results show that the unmodified compressor structure and blade shape under the adjustment of the environment for the underwater,the compressor underwater pump water efficiency to meet the general conditions of the use of the requirements,the compressor can be preliminary with the use of air-water engine’s compressor requirements.The analysis of the parameters of the underwater model and the analysis of the flow field are due to the characteristics of the flowchannel and the blade shape have a certain obstruction to the flow of water,resulting in the lack of underwater performance of the compressor.In order to obtain better performance in both water and air modes,the structure has yet to be further improved in the optimization space,which will provide a useful reference for future compressor design of water-air engine.