Research On Energy Recovery In Hybrid Of Air Powered Engine & Internalcombustion Engine

Air powered engine (APE) is a new type engine, using compressed air or liquid nitrogen as storage medium. With no combustion, zero pollution and none fossil consumption, APE gets people's more and more attention. But its practicality of APE is limited by energy density, continues distance of driving and efficiency restricted by environment. Internal combustion engine (ICE) can eliminate disadvantage of APE such as short continues distance of driving. Besides, the heat of exhaust and cooling water of ICE can improve the efficiency of APE. So it is an effective solution to combine APE and ICE. The hybrid of APE and ICE also can optimize the working condition of ICE, cancel idle condition and recovery energy easily.Improving APE efficiency is the idea at the beginning. Then a series of theoretical and experimental research were done, summarized as follows:1. Base on classical thermodynamics, it researched lost exergy distribution in the opening Rankin cycle and got that exhaust is one of the key lost exergy part. Limited by environment temperature, cycle efficiency is hardly improved. Reheat system, the combined APE and ICE are the feasible program that can eliminate the restriction of environment and improve the APE efficiency.2. Based on life cycle efficiency analysis method, the efficiency study of a variety of power forms for automobile results that the hybrid of APE and ICE has quite equal efficiency with the hybrid of HEV and their efficiency is higher that others. So the hybrid of APE and ICE is feasible and competitive.3. Based on variable mass thermodynamics the model of working process in cylinder was modified with leak model. The simulation result is more close to the experiment result. The influence of working parameters and structure parameters on permormance of APE is analysised. The key pareamemeters were optimized.4. Combined model of APE, ICE, and the heat exchanger between cooling system pipes of ICE and inlet air pipes of APE was formed. The APE performance and ICE cooling system status have been changed in different programs. And the improvement and matching of different programs were researched. The result shows that the hybrid of APE and ICE can achieve two objectives. Firstly, the dynamic and economic performances of APE are improved by recycling the heat of cooling water, comparing to working alone. Secondly, the cooling system without radiator and fan can satisfy the cooling requirement. The system can not only simplify the cooling system structure, but also can reduce the energy consumption by fan.5. The test bench of hybrid system including APE, ICE and heat exchanger system was set up. Experiment result shows that the hybrid based on the heat recovery from cooling water is feasible.Based on the previous work, the thesis put forward a variety of solutions improving the APE efficiency. It discussed the feasibility of hybrid of APE and ICE. And it established the simulation and experiment platform for hybrid of APE and ICE based on heat energy recovery from cooling water. The work provides the theory foundation for further research.