Optimum Design of a Rotary Compressor with a Controlled Sliding Vane
Date Issued
2005
Date
2005
Author(s)
Zhong, San-Yuan
DOI
zh-TW
Abstract
A rotary compressor with a controlled sliding vane is designed for a specific flow rate in this study. The genetic algorithms of the optimization method is used with the objective function of the maximum total efficiency, that is the multiplication of the mechanical efficiency and the volumetric efficiency, to determine the dimensions of the compressor. The envelop theorem is used to design the enveloped profiles on the cam plates and the contour of the rotor. When the rotor rotates, the bearings on the vane moves along the envelop profiles on the cam plates to control the motion of the vane. An appropriate design and fabrication of the compressor eliminates friction loss between the vane and the rotor. Utilizing the air outlet formed by the right cam plate and the right cover plate replaces the conventional outlet valve. A mathematical model of the compressor is generated. The geometric relation, the envelopes on the cam plate and the rotor, air properties and the vane dynamic behavior of the compressor are analyzed. The optimum designed compressor is fabricated and tested, and the calculated results are compared with the test data. At the rotor rotational speed of 180 rad/s, the compression ratios are 3.01 and 2.91, the outlet temperatures are 315.48 K and 312.25 K, the volumetric efficiencies are 80.76 % and 79.71 %, the mechanical efficiencies are 70.33 % and 68.53 %, the total efficiencies are 56.79 % and 54.62 % for the calculated results and the test data, respectively. The deviations of the calculated results and test data are within 4 % at the rotor rotational speed from 50 rad/s to 180 rad/s. With the same specific flow rate as an existing compressor, the maximum mechanical efficiencies of the optimum designed compressor and the existing compressor are 69.68 % and 68.3 %, respectively, at the corresponding rotational speeds of 146.6 rad/s and 125.6 rad/s. The mechanical efficiency of the current designed compressor is 1.38 % higher than that of the existing compressor.
Subjects
凸輪轉子機構
遺傳演算法
包絡線
controlled sliding vane
genetic algorithms
envelop
Type
thesis
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