水下航行体燃气涡轮机工作特性数值研究  

Numerical Investigation to Gas Turbine Performance of Underwater Vehicle

作　　者：伊进宝[1] 赵卫兵[1] 师海潮[1] 

机构地区：[1]西安精密机械研究所,陕西西安710075

出　　处：《鱼雷技术》2010年第5期376-380,共5页Torpedo Technology

摘　　要：基于求解雷诺平均的NAVIER-STOKES方程组,对水下航行体涡轮机的工作特性进行了数值计算,研究了水下航行体涡轮机气动性能的主要参数(涡轮功量、流量和效率)与状态参数(转速、膨胀比)之间的关系,分析了涡轮机通流部分各种损失的变化规律,为部分进气燃气涡轮机设计及工程应用提供参考。研究表明,涡轮机喷管流动状态不受其后叶轮的影响,只与涡轮机膨胀比有关;存在一个临界膨胀比值,涡轮机膨胀比大于此值时,喷管速度系数和总压恢复系数随膨胀比变化比较平缓,而小于时,喷管速度系数和总压恢复系数随膨胀比减小而急剧减小;存在一个临界膨胀比,使得涡轮机效率最大;膨胀比大于此值时,涡轮机效率随膨胀比减小而减小;小于此值后,涡轮机效率随膨胀比减小而急剧降低;同一膨胀比下,涡轮机转速减小,涡轮机效率降低。A three-dimensional,viscous,steady computational fluid dynamics（CFD） analysis is performed for investigating gas turbine flow field and performance of underwater vehicle by solving RANS-Navier-Stocks equations and RNGκ-ε turbu-lence model.The flow detail and losses of the turbine are studied in designing and off-designing conditions.The effect factor on turbine efficiency is analyzed.The results show that the flow characteristics of nozzle are independent of turbine blade flow.When pressure ratio is less than a critical value,the performance of turbine degrades rapidly as pressure ratio decreases.The turbine efficiency gets the maximum at another critical pressure ratio,and descends fast with pressure ratio decreasing when pressure ratio is less than the critical value.The turbine efficiency also descends as rotational speed decreases.

关 键 词：水下航行体 燃气涡轮机 工作特性 数值模拟 

分 类 号：TJ630.32[兵器科学与技术—武器系统与运用工程] TP391.9[自动化与计算机技术—计算机应用技术]