Effect of clearance on dynamic response and performance of a rotary compressor
Date Issued
2006
Date
2006
Author(s)
Huang, Kai-Min
DOI
zh-TW
Abstract
This study develops dynamic simulation and analysis strategic of a single sliding-vane rotary compressor and analyzes effects of clearance on dynamic response and performance of the rotary compressor. It also provides accurate and fast solutions for contact detection and computing technology of penetration. Two types of contact are considered. One type is the contact between the vane and the vane slot, and the other type is the contact between the semi-cylindrical surface of the vane and the envelope surface of the stator. The continuous Hertzian contact force model is utilized to calculate contact forces of the compressor components with consideration of frictional forces. The dynamic equations including constrained forces of the compressor system are derived by using multibody dynamics. The numerical integration uses the fourth-order Adams predictor-corrector method incorporated with the fourth-order Runge-Kutta method. With two-dimensional and three-dimensional animations of computer graphics, it is easy to understand simulated results. When the compressor is turned on or it operated with low rotational speed, the unstable acceleration of the vane occurs. As the rotational speed increases, the unstability of the vane is reduced while the input power, the output power and the friction power of the compressor increase. The vane becomes unstable when the clearance exists. The unstability of vane is significant when impact happens. As the clearance increases, the input power, output power and mechanical efficiency of the compressor are decreased, and contact types of the vane with the stator and the rotor increase. The maximum and average contact forces of the vane also increase. A stator with three lobes and the rotational speed of 1500 rpm with and without clearance are studied. If there is no clearance, the vane has 10 kinds of contact modes, the maximum contact force of the vane is 333 N, and the mechanical efficiency of the compressor is 75.7 %. If the clearance is equal to 0.02 mm, the vane has 16 kinds of contact modes, the maximum contact force of the vane is 345 N, and the mechanical efficiency of the compressor is 74 %. If the clearance is equal to 0.05 mm, the vane has 19 kinds of contact modes, the maximum contact force of the vane is 362.8 N, and the mechanical efficiency of the compressor is 70.8 %. If the clearance is equal to 0.1 mm and 0.2 mm, the mechanical efficiency of the compressor is 65.1 % and 54.2 %, respectively. It is expected that the results of this study can also be applied to compressors with these two types of contact problem.
Subjects
壓縮機
多體動力學
間隙
碰撞
接觸偵測
compressor
multibody dynamics
clearance
collision
contact detection
Type
thesis
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