The cylinder flow field in the electronic controlled air powered engine which is new de-veloped is studied as the object.Firstly,the geometry model was built and the pre-processing software-ICEM of CFD was used to mesh the model.Then,the dynamic simulation was done by moving-grid technology in the Fluent software.After it was done,the characteristics of the inter-nal flow field were analyzed,then the distribution of velocity field and pressure field about the gas in the process of working were obtained.At the same time,comparisons were made between the numerical simulation calculation and the experimental results in bench of air powered engine. The results showed that the results with numerical simulation of moving-grid were close to exper-imental results,the dynamic process of the flow field in cylinder of the engine was accurate and reliable,the results of simulation could provide a reference for the design of the engine.When the rotational speed was 450 r/min,the simulative indicated power of air powered engine was 0.62 kW and the experimental indicated power was 0.55 kW under the same conditions,the maximum error of the indicated power between simulative results and experimental results was 11.2%.The effective power of air powered engine was 0.45 kW by the data in the power measuring device,while using homemade dynamometer device,and then acquiring the mechanical efficiency was 81.8%.The research results provide the basis for the further improvement of the air powered engine's performance.%以全新研制的电控气动发动机气缸流场域为研究对象,建立其几何模型,运用CFD前处理软件ICEM对流场域几何模型进行网格划分,再运用Fluent动网格技术进行动态模拟计算,分析其气缸内部流场特性,进而得出气体在工作过程中各个阶段的压力场和速度场分布.同时,将模拟计算数值与气动发动机台架实验所得值进行比较.结果表明:动网格数值模拟结果与实验结果较为接近,气动发动机气缸内流场动态仿真过程准确可靠,仿真结果可为气动发动机设计提供参考.当转速稳定于450 r/min时,由仿真模拟所得数据计算得此气动发动机指示功率为0.62 kW,实验时测算得同条件下实验指示功率为0.55 kW,求得仿真和实验指示功率的最大误差为11.2%.利用自制的测功装置测得实验时有效功率为0.45 kW,进而求得机械效率为81.8%.研究结果为下一步改善气动发动机性能提供了依据.
展开▼
