【摘要】 大口径轮盘式特种调节阀(简称特种阀)是高空试验台保证进气系统温度和压力及时达到发动机飞行环境所对应温度和压力的主要调节阀之一。为了提高特种阀流量系数控制模型的精度，基于Fluent软件模拟研究特种阀的内部流动特性，探索分析了9个开度(10°、20°、30°、40°、50°、60°、70°、80°、90°(全开))和9个压比(0.1、0.2、0.3、0.4、0.5、0.6、0.7、0.8、0.9)对特种阀内部速度和压力的影响规律。结果表明：特种阀内速度和压力沿无级调节盘呈对称分布，气流速度随着开度的增大而逐渐增加，在阀前压力为200 kPa、压比为0.1时，开度为90°的进口速度为72.92 m/s,约为开度10°的9倍；在开度不变时，进口速度随着压比增大先不变后减小，存在临界压比；开度为10°～50°时临界压比约为0.5,开度在60°～90°范围内临界压比约为0.6;特种阀的流阻系数随着开度和压比的增大而减小，开度为10°～40°时，流阻系数下降速度最显著，其中开度从10°增大到30°时，流阻系数下降了88%。更多还原

【Abstract】 The large diameter disc-type special control valve(i.e.special valve) is one of the main control valves which control timely temperature and pressure of the air intake system to the temperature and pressure of flight environment for altitude test facilities.In order to improve control model precision of the special valve flow coefficient, the flow characteristics were studied based on Fluent software simulation analysis, and the influences of opening of special valve(10°,20°,30°,40°,50°,60°,70°,80°,and 90°(full open)) and pressure ratio(0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,and 0.9) on internal velocity and pressure of special valves were studied.The results show that the velocity and pressure are symmetrically distributes along the stepless adjustment disc of special valves, and the air velocity gradually increases with an increase of opening.When upstream pressure of the valve is 200 kPa and the pressure ratio is 0.1,the inlet velocity is 72.92 m/s in the opening 90°,which is about 9 times of the opening 10°.At the same time, when the opening is constant, the inlet velocity firstly remains constant then decreases with an increase of pressure ratio, there is a critical pressure ratio.The critical pressure ratio is about 0.5 at opening between 10° and 50°,and it is about 0.6 at opening between 60° and 90°.Finally, the flow resistance coefficient decreases with an increase of opening and pressure ratio, and it decreases dramatically when the opening varied between 10° and 40°.Especially, the flow resistance coefficient decreases 88% with an increase of opening from 10° to 30°.更多还原