单/双向进气再入式涡轮内部流动特性研究  

Investigation of Flow Characteristics on Single/Double Inlet Re-entry Turbines

作　　者：钟兢军[1] 陈帝云 韩吉昂[1] ZHONG Jing-Jun, CHEN Di-Yun, HAN Ji-Ang(Marine Engineering College, Dalian Maritime University, Dalian 116026, Chin)

机构地区：[1]大连海事大学轮机工程学院,大连116026

出　　处：《工程热物理学报》2018年第8期1697-1705,共9页Journal of Engineering Thermophysics

基　　金：辽宁省高等学校创新团队资助项目(No.LT2015004)

摘　　要：利用三维数值计算方法,得到了单/双向进气再入式涡轮总体性能参数,并对其内部流动进行了详细研究。通过对数值模拟结果的分析表明:单向进气再入式涡轮尺寸较大、结构复杂的再入管道,使得流经其中的燃气总压损失大于双向进气结构型式,且单向进气再入涡轮第二级动叶进口负冲角更大,造成更高的进气损失,因而其总静效率较双向进气结构型式低2.37%。单向进气再入涡轮动叶排两侧压力沿周向分布不均匀性参数分别为1.0472和1.6530,双向进气结构型式为1.8497和1.1233,双向进气结构型式压力沿周向不均匀性更大,导致轴向间隙内的燃气沿周向窜流的程度更大,且双向进气结构型式的第一级进气扇区与出口段布置在同侧,使得沿周向窜动的燃气更易直接流出涡轮,降低了再入管道对前面级燃气的收集能力。Three dimensional numerical investigation was carried out for the single and double inlet re-entry turbines, the performance was obtained and the inner ftow field was analyzed in detail. Conclusions show that the total pressure loss during the gas passing through the duct is higher than that of double-inlet case due to the larger size and more complex structure of the re-entry duct of the single-inlet re-entry turbine. Moreover, the magnitude of inlet negative incidence angle at secondary rotor area of single-inlet re-entry turbine is also larger that of double-inlet re-entry turbine, and results in larger losses in single-inlet case. On the whole, the total to static efficiency of single-inlet case is 2.37% lower than the double-inlet case. The circumferential static pressure non-uniform parameters at both sides of single-inlet re-entry turbine rotor blade row are 1.0472 and 1.6530, and for double-inlet case the values are 1.8497 and 1.1233, it indicates that the non-uniformity of double-inlet case is larger than single-inlet case, and leads to more gas flow in the circumferential direction in the axial gap. In addition, the first stator partial admission arc of double-inlet case is in the same side of the outlet part of the re-entry turbine, and makes it more easily for the gas flowing in the circumferential direction to flow directly to the turbine outlet which decreases the collecting ability of the re-entry duct.

关 键 词：单/双向进气 再入式涡轮 性能参数 不均匀性参数 数值模拟 

分 类 号：V236[航空宇航科学与技术—航空宇航推进理论与工程]