关键词: 空气系统;径向内流;导流盘;旋流系数;科氏力;数值模拟 

Abstract: In order to reveal the flow characteristic of radial inflow of air system, the numerical simulation of flow at bleeding structures with/without guide disk was performed.The comparison of the flow field and the total temperature along flow path between two bleeding structures was carried out as well. The results indicate that the lower flow resistance, especially for flow at low mass flow rate, and the higher total temperature decrease of airflow is achieved by using the guide disk. The decrease of total temperature for bleeding structure with guide disk is reached 40K while another structure gains 10K total temperature reduction. The peak value of swirl ratio grows up with the increase of mass flow rate at two bleeding structures. The peak value at the structure using the guide disk is achieved 3.0in large mass flow rate, which weakens the function of reducing flow resistance. The performance of the bleeding air in terms of resistance decrease and total temperature decrease is obviously improved through transferring power outwards and decreasing the swirl velocity of air flow by the guide disk. 

Key words: Air system;Radial inflow;Guide disk;Swirl ratio; Coriolis force;Numerical simulation