Abstract
Twin-screw refrigeration compressors have been widely used in many industry applications due to their unique advantages. The performance of twin-screw refrigeration compressors is generally predicted by one-dimensional numerical simulation or empirical methods; however, the above methods cannot obtain the distribution of the fluid pressure field and temperature field inside the compressor. In this paper, a three-dimensional model was established based on the experimental twin-screw refrigeration compressor. The internal flow field of the twin-screw compressor was simulated by computational fluid dynamics (CFD) software using structured dynamic grid technology. The flow and thermodynamic characteristics of the fluid inside the compressor were analyzed. The distribution of the internal pressure field, temperature field, and velocity field in the compressor were obtained. Comparing the P-θ indicator diagram and the performance parameters of the compressor with the experimental results, it was found that the results of the three-dimensional numerical simulation were consistent with the experimental data. The maximum error was up to 2.578% on the adiabatic efficiency at the partial load working condition. The accuracy of the 3D numerical simulation of the screw compressors was validated and a new method for predicting the performance of twin-screw refrigeration compressors was presented that will be helpful in their design.
Highlights
Compared with other kinds of compressors, twin-screw refrigeration compressors have the characteristics of a simple structure, less damaged parts, good running stability, and strong adaptability
computational fluid dynamics (CFD) software and the variation gas pressure inside the flow compressor was calculated by the CFD software and the variation of gas pressure inside the flow channel was analyzed in detail
Since a 5-6 rotor profile was used in this simulation, the pressure changed periodically every 72◦
Summary
Compared with other kinds of compressors, twin-screw refrigeration compressors have the characteristics of a simple structure, less damaged parts, good running stability, and strong adaptability. Many scholars have proposed mathematical models for the working process of twin-screw refrigeration compressors [4,5] These models fully consider the various leakage paths of the compressor, oil and gas heat transfer, power loss, etc., and can effectively predict the performance of the compressor. Kovacevic et al [6,7] introduced an advanced grid generation method and developed a completely original boundary adaptive program that can be applied to any rotor shape This method can improve the accuracy of the simulation calculation, can better predict the performance of the compressor, and allows the design of such machinery to have a lower development cost. This paper used CFD technology to simulate the working process of the twin-screw refrigeration compressor under different loads, analyze the flow characteristics of the compressor internal fluid, and compressor under different loads, analyze the flow characteristics of the compressor internal fluid, obtain the pressure, velocity and temperature distribution.
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