水下航行器摆盘发动机缸内过程数值仿真

摆盘发动机性能的好坏决定于其气缸内工质压力、温度等参数的变化曲线,而这些变化曲线是由气缸内的工质质量、内能所决定的.为此在建立了摆盘发动机配气过程进排气面积数学模型的基础上,建立了缸内工质的内能和质量的微分方程.然后采用龙格-库塔法对微分方程进行了数值求解,得到一个工作循环内内能、质量、温度、压强等热力参数的曲线图,并计算了循环过程各项性能指标.该数值计算可用于判断配气参数、配气阀尺寸等对工作过程、性能指标的影响,从而指出性能改进的方向及潜力大小.

In-cylinder Working Process Numerical Simulation of Underwater Vehicle Swashplate Engine

The performance of underwater vehicle swashplate engine is determined by the pressure and temperatare of the gas versus duration curve, which is dominated by the mass and internal energy of the gas in the cylinder. Based on the mathematical models of the air - in area and air - out area, the differential equations of the internal energy and mass of the gas in the cylinder were proposed. With the help of Runge - Kutta methods, a series of imitating calculations of the differential equations of in - cylinder working process were carried out. The curve diagrams of thermal parameters in a cycle, for example, internal energy, mass, temperature and pressure of the gas, were obtained. Many performance parameters of the cycle process were calculated. The calculation can be used to judge how the distribution parameters and distribution valve dimension affect the working process and the performance parameter. The result can give guide to the performance improvement.