Study On Aerodynamic Characteristics Of Air-powered Engine Gas Distribution System

With the development of our economy and the improvement of people’s livingstandard, automobile industry has obtained the rapid development and car ownershiphas increased dramatically. The car brings people convenience, also bringstrouble,such as the consumption of non-renewable resources, automobile exhaustemissions, environmental pollution, traffic congestion, etc.To solve above problems, this paper first introduces the new energy vehicles andthe current research status of air-powered engine and gas distributionsystem.Introduce modern air-powered urban traffic environmental car designed byprofessor Chen Ning and his team at the school of electric power engineering ofChina university of mining and technology,which can be used to a city or regionshort-distance. The vehicle expands by clean compressed air in the air-poweredengine.There’s no pollution, low carbon environmental protection, at the same time,the car body is exquisite so that it can improve the urban traffic congestion.In this paper, based on modern air-powered urban traffic environmental car, a setof new, suitable air-powered engine for the vehicle is designed.In the second chapter,by using the theory of heat transfer and thermodynamics analysis, thermodynamiccalculation in the gas distribution system of the whole engine and type selection arefinished. The gas distribution valve and efficient and reasonable gas distributionsystem aer designed.Using Ansys software and dynamic mesh technique, through the UDF programto control the movement of slide valve and cylinder, the aerodynamic characteristicsof a gas distribution system of air-powered engine is simulated. The distribution ofpressure, temperature, entropy, mass flow rate of inlet are concluded under differentvalve opening.Through building gas distribution system test bench, the gas temperature andpressure are measured before and after the valve under different opening valve.Theexperimental data and numerical simulation are compared.It proves the correctnessand reliability of the numerical simulation.Experimental results verify the accuracy of numerical simulation.By using thenumerical simulation results,the distribution of the largest losses in the valve is foundout.According to these parts,the best and minimum loss valve is designed by usingAnsys Workbench parametric modeling and optimization. It is proved the rationalityof optimization by compared with the numerical simulation before and after optimization.