多气阀气动发动机设计及特性分析

随着环境问题的日益严重,气动发动机作为一种清洁能源的动力装置而逐渐被人们所关注。然而,能量利用效率低和输出功率低已经严重影响了气动发动机的发展。分析了气动发动机工作过程中的能量损失,并在此基础上提出了一种多气阀的新型气动发动机机构。建立了气动发动机工作过程数学模型。为了验证模型的准确性,搭建实验平台对气动发动机进行实验研究。通过误差与进气压力和曲轴转速之间的关系对所建立的模型进行修正,得到精确的气动发动机工作过程的数学模型。在此模型的基础上得到多气阀气动发动机的扭矩和能量利用效率特性。结果显示,在同样的结构参数下,进气压力为2MPa时,相比单进气和排气的气动发动机机构,多气阀气动发动机气输出扭矩提高了26.2~41.9N·m,能量效率提高了8%~10%。

Design and Characteristic Analysis for Multi-valve Air Powered Vehicle

With the serious worldwide environmental problem, the air powered vehicle as the clean energy power device has been paid more attention. However, the poor energy efficiency and low output power have seriously effect on the development of the air powered vehicle. Firstly, we analyze the energy loss during the working process and propose a new kind of air powered vehicle with multi-valve. Moreover, a mathematical model of the air powered vehicle is built and verified by the experimental study. To obtain more precise mathematical model, the relationship of the error, rotational speed and supply pressure are applied. Based on the modified model, the output torque and energy efficiency are obtained. The results show that if the supply pressure is set at 2 MPa, under the same structure parameters, the output torque of the multi-valve air powered vehicle is higher than that of the single valve air power vehicle by 26.2 N·m to 41.9 N·m. The working efficiency of the multi-valve air powered vehicle is higher than that of the single valve air power vehicle by 8%~10%.