斯特林发动机瞬态模型及特性分析

为获得斯特林发动机的动态特性和优化方案,将损失机制和压力梯度耦合进控制方程中,提出一维瞬态斯特林循环分析模型及分析方法,并针对GPU-3斯特林发动机进行模型验证和特性分析.模型的指示功率相对误差平均值约为4.8％,热效率的相对误差小于1％.当氦气工质在热源温度为977 K、平均压强为2.76 MPa时,输出功率随转速的...

TRANSIENT MODEL AND CHARACTERISTIC ANALYSIS OF STIRLING ENGINE

In order to optimize design of Stirling engines, a transient model is proposed, based on basic control equations coupled with loss mechanism and pressure gradient synchronously, and the model is verified by experimental data of a GPU-3 Stirling engine. The results show that the average relative error is 4.8% between numerical and experimental results for indicated power, and it is less than 1% for the relative error of thermal efficiency. The peak of indicated power occurs at 3000 r/min for an average helium pressure of 2.76 MPa and heating temperature of 977 K, and the friction resistance loss increases from 0.174 kW to 3.179 kW with rotational speed increasing, demonstrating the optimal operating speed ranges 2500-3000 r/min. The three main losses are the friction resistance loss, displacer shuttle heat transfer loss and finite speed pressure loss. The pressure drop on regenerator accounts for more than 90% of the total, with a transient value of 188 kPa, indicating it is an effective way to alleviate flow resistance loss by optimizing a regenerator.