本文提出了一种计算双螺杆膨胀机示功图的新数学模型。模型中采用了与外转子旋转角度有关的几何参数，如槽体积、吸入口和排出口面积、泄漏面积等。理论分析中同时和分别考虑了五通道内泄漏、喷油、气油传热和制冷剂性能的影响。验证模型和计算结果-p指示图，实验记录-给出了双螺杆膨胀机的p示功图。理论计算结果与实验数据吻合较好，表明该模型可作为性能预测和产品开发的有力工具。引文:ASHRAE会议论文，2010年，第116卷，pt。新墨西哥州阿尔伯克基2号

In this paper a new mathematical model for calculating the indicator diagram of twin screw expander is presented. The geometric parameters related to the rotation angle of male rotor are used in the model such as groove volume, suction and discharge port area, leakage area etc. The effects of internal leakage through five paths, oil injection, gas-oil heat transfer and refrigerant property are taken into account simultaneously and separately in the theoretical analyses. To verify the model and the calculated?-p indicator diagram, experimental recording of?-p indicator diagram of twin screw expander was carried out. The results of theoretical calculation were in good agreement with the experimental data, which lead to conclusion that the model could be used as a powerful tool for performance prediction and product development.