气动发动机缸内流场动态分析与研究

发布时间：2018-07-08 17:35

本文选题：气动发动机 + 计算流体动力学　；参考：《安徽农业大学》2016年硕士论文

【摘要】：随着汽车工业的快速发展,燃料短缺问题日趋严峻。经过不断探索,新能源汽车逐渐驶入千家万户,新能源汽车的应用对雾霾有较大的抑制作用。汽车动力设备的发展从蒸汽机时代、内燃机时代渐渐发展到的新能源时代。从宏观上看,传统动力设备都通过燃料燃烧,对外做功,燃烧过程对环境的污染是不可避免的,电动汽车的废旧电池也会间接地对环境造成污染。因这些问题的存在,国内外专家学者对气动发动机的研究逐渐深入。本文以多学科交叉的方法并结合流体动力学理论,设计了一款两级气动发动机,进行了气缸内流场动态仿真分析与实验,探索了空气储能介质对气动发动机性能的影响。通过总结国内外气动发动机各种结构和性能的研究热点,提出了一种以某空气压缩机为原机型的新型气动发动机,经过理论分析、设计加工及台架实验等一系列工作,最终完成了样机制造。在计算流体动力学以及CFD软件的支撑下,对该款气动发动机的缸内高压气体动态流动过程进行了仿真分析,由微观的精细分析得出了缸内动态流场对气动发动机功率、效率等的影响。通过仿真计算与实验结果的对比,为气动发动机的进一步优化提供了参考。本文主要内容如下:首先论述了气动发动机工作原理及设计方案;对缸内流场建立三维模型和控制方程,并介绍内部湍流模型,同时分析缸内流场动态流动和整机运动状态,模拟缸内压力和速度的变化,计算发动机有效功率,并基于MATLAB对发动机活塞运行状态进行仿真;最后对气动发动机台架实验和仿真结果进行了对比分析。
[Abstract]:With the rapid development of automobile industry, the problem of fuel shortage is becoming more and more serious. After continuous exploration, new energy vehicles are gradually driving into thousands of households. The application of new energy vehicles has a great inhibitory effect on haze. The development of automobile power equipment from the steam engine era, the internal combustion engine era to the new energy era. From the macro point of view, the traditional power equipment will pollute the environment through fuel combustion, external work, combustion process is inevitable, the waste batteries of electric vehicles will also indirectly cause pollution to the environment. As a result of these problems, the domestic and foreign experts and scholars on the pneumatic engine gradually in-depth research. In this paper, a two-stage pneumatic engine is designed by means of multidisciplinary method and hydrodynamic theory. The dynamic simulation analysis and experiment of flow field in cylinder are carried out, and the influence of air energy storage medium on the performance of pneumatic engine is explored. A new type of pneumatic engine with a certain air compressor as its original model is proposed by summarizing the research hotspots of various structures and performances of pneumatic engine at home and abroad. After theoretical analysis, design and processing, and bench experiment, etc, a series of work has been carried out. Finally, the prototype manufacturing is finished. Under the support of computational fluid dynamics and CFD software, the dynamic flow process of high pressure gas in the cylinder of the pneumatic engine is simulated and analyzed. The power of the dynamic flow field in the cylinder to the pneumatic engine is obtained from the microscopic fine analysis. The effect of efficiency, etc. The comparison of the simulation results and the experimental results provides a reference for the further optimization of the pneumatic engine. The main contents of this paper are as follows: firstly, the working principle and design scheme of pneumatic engine are discussed, the three-dimensional model and control equation are established for the flow field in cylinder, and the internal turbulence model is introduced. At the same time, the dynamic flow in cylinder and the motion state of the whole engine are analyzed. The change of cylinder pressure and velocity is simulated, the effective power of engine is calculated, and the running state of engine piston is simulated based on MATLAB. Finally, the results of bench test and simulation of pneumatic engine are compared and analyzed.
【学位授予单位】：安徽农业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U464

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