不同喷雾工质下微型燃气轮机压气机的湿压缩特性研究

The improvement of the performance of micro gas turbines is a hotspot widely researched. Wet compression technology which injects coolant into the compressor to reduce the power consumption of the compressor by coolant evaporation is an effective approach to improve the performance of micro gas turbines. In order to analysis the influence of wet compression using two different coolants of water and isooctane on the compression performance and the flow field of compressor of micro gas turbines, a NASA CC3 centrifugal compressor is numerical simulated by CFX based on Lagrange particle tracking model and k-ε turbulence model. The results show that both wet compression using isooctane and water can increase the mass flow rate of the compressor and reduce the power consumption per unit mass flow rate, but the compression performance varied due to the different evaporation characteristics of droplets of different spray working fluids. Wet compression using different spray working fluids lead to similar internal flow field. Wet compression using liquid water has a better performance under small droplet diameter, while wet compression using isooctane shows an advantage in increasing the mainstream mass flow rate and cooling down the air flow while the droplet diameter is greater than 20 μm.