Preliminary Design And Internal Flow Field Analysis Of Rotary Piston Internal Combustion Engine

With its simple structure, the advantages of economy and security, reciprocating internal combustion engine has been vigorously promoted. It is known as the main power of vehicles, ships and other means of transport with its excellent adaptability. However, lower transmission efficiency, lateral pressure and dead still limit the performance of the internal combustion engine upgrade. With the growing concern for environmental issues and the need for energy conservation, people will turn to the rotary piston internal combustion engine which has the better transmission performance, higher energy efficiency.A differential rotary piston internal combustion engine was designed in this paper. At first, under the rated speed, thermodynamic calculation have been carried out when the engine uses diesel fuel. Secondly the mathematical models of the energy conversion device and energy transmission device were established, and optimized the energy transmission device. The angular velocity of vane piston were calculated according to the mathematical model of energy transmission device; then the three-dimensional geometric model of the energy conversion device was established and meshed; application with fluent software, exhaust, intake and compression process were simulated and in the combustion chamber using the dynamic mesh. At last, on the basis of this, the influence of the internal gas flow at different speeds was studied and analyzed.Through the analysis and research:it is found that the effective power of the rotary piston internal combustion engine is improved by 34.56% compared with the similar six cylinder reciprocating four stroke internal combustion engine. The internal-combustion engine inlet, exhaust gas and compression process have been simulated. At the intake process, the vortex generation is mainly driven by the intake air flow which entrained gas in the combustion chamber; at the compression process, mainly due to the piston movement of the blade combustion chamber flow field changes. Speed affects larger to indoor airflow in the combustion. At different speeds, the trends of the average combustion chamber pressure, temperature, flow velocity and turbulent kinetic energy are similar, but there is difference in value. As the speed increased, average speed and average turbulent kinetic energy are increased. The change of the average temperature and average pressure is more complex, but at low speed, each process is relatively full and the trend is relatively flat; and at high speed, the magnitude of change is large.