本文简单介绍了微型摆式发动机的结构和运行原理，并建立了描述其循环运行的零维模型，在此基础上，比较了理想循环与摩擦力影响较大的循环特征差异，分析了运行中摩擦力对循环运行的影响规律，相关的分析和结论可为此类发动机的优化设计提供参考。

The capillary tube is often served as an expansion device in small refrigeration and air-conditioning systems. In this paper, a generalized correlation for predicting the refrigerant mass flow rate through the adiabatic capillary tube is developed with approximate analytic solutions based on the extensive data for R12, R22, R134a, R290, R600a, R410A, R407C, and R404A, in which a homogeneous equilibrium model for two-phase flow is employed, and there is a subcooled liquid or saturated two-phase mixture at the inlet of the capillary tubes. The collected database about capillary tubes covers the inner diameter from 0.5mm to 2mm, the tube length from 0.5m to 5m, the condensing temperature from 20℃ to 60℃, the subcooling from 0℃ to 20℃, and the quality from 0 to 0.3 at the inlet. Assessments for the correlation are made with some experimental data for R12, R22, R134a, R290, R407C, R410A, and R404A obtained from the open literature and some existing correlations based on the experimental database also. The present correlation yields an average deviation of -0.83% and a standard deviation of 9.02% from the database.

The leakage is unavoidable and has considerable influence on the performance of a scroll compressor. In a meso-scale scroll compressor, the working gas leakage is more serious because the gaps between the scroll plate pairs are more difficult to be sealed than the case in a normal scale scroll compressor. This paper analyzes the leakage and related factors with a simplified model, and discusses the performance that resulted from gas loss due to both leakages from tangential and axial directions in meso-scale compressors. The discussion and related results are helpful to determine some key parameters in the design and manufacture of meso-scroll compressors.

利用均相模型对微通道两相换热器（蒸发器、冷凝器）进行模拟，通过制冷工质R134a热力状态及参数的计算模拟换热器设计工况下的稳态情况。首先建立换热器仿真模型，得出设计工况下的换热器设计结果，然后此基础上，着重分析当外界温度、进出口状态以及质量流量发生变化时，相应的换热器性能参数变化情况，以及相关影响因素。

讨论了微小型化的直线电机驱动的活塞压缩机特性。运用电磁场有限元方法对直线电动机电磁场模型进行求解，分析了电动机内部的磁场和磁力线分布情况；建立了电动机动子动力学模型和驱动电路模型，得到系统的运行方程组并对其求解，根据计算结果对压缩机的驱动力、活塞行程、绕组电流和频率特性等进行了分析，同时就余隙容积和泄漏对这种微小型活塞压缩机的影响进行了探讨。结果表明直线电机驱动的微小型活塞压缩机在理论上是可行的，有进一步研究、优化的必要。