Peng Y.-H.,Nanjing Research Institute on Simulation Technique |
Liu D.,Jiangxi University of Finance and Economics |
Lin Y.-Z.,Beihang University
Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology | Year: 2010
The primary zone flow fields of two types of dome configurations of design A (double swirlers with duplex nozzle) and design B (triple swirlers with pre-filming airblast nozzle)were measured by PIV technology under atmospheric pressure and temperature in order to investigate the effects of the two types of dome configurations on the primary zone flow field of high temperature rise combustor. A single rectangle sector module combustor was used in the experiment for lean blowout under the idle condition, and the pattern factor experiment of high power condition was conducted in a three cups rectangle combustor. The results showed that the pattern factor of design B was improved by 41 percent compared with that of design A, and the fuel air ratio of lean blowout was improved by 13.5 percent compared with that of design A. The performance difference of combustion experiments, including pattern factor and lean blowout, could be analyzed by the PIV results, and the insight relationship between flow field and combustion performance could be found out.
Deng F.,Nanjing University of Science and Technology |
Chen S.-S.,Nanjing University of Science and Technology |
Tan X.-Z.,Nanjing University of Science and Technology |
Xu T.,Nanjing Research Institute on Simulation Technique
Shiyan Liuti Lixue/Journal of Experiments in Fluid Mechanics | Year: 2010
Different tails were designed for canard-controlled long-range missile including no-fins, "T" shaped fins and grid fins, investigated the influence of the long-range missile's aerodynamic characteristics especially the rolling characteristics of different tails at different speeds and attack angles with wind tunnel test. The results indicated that compared with the missile with grid fins, the missile with "T" shaped fins showed good lift characteristics and rolling characteristics in transonic flow, the lift characteristics of the missile with grid fins performance excellent and it's capable of executing the roll control in supersonic flow, and it's important to reduce the drag of grid fins in the future.
Lv H.,Nanjing Research Institute on Simulation Technique |
Lv H.,Beihang University |
Zhao J.,Nanjing Research Institute on Simulation Technique |
Zhao J.,Beihang University
Journal of Aircraft | Year: 2011
A minimum transmission power loss calculation method is proposed, and the specific load configuration is obtained to improve energy transmission capability of the aircraft electric power system. The method is divided into three steps. First, a node table-style format of the aircraft electric power system is proposed according to its characteristics. Second, the transmission power loss equation is modeled by introducing the power flow calculation method. Third, the system transmission power losses with different load types are studied. Using particle swarm optimization algorithm, the minimum transmission power losses with different system load types are obtained. With the optimum load configuration, the transmission power loss is reduced and energy transmission capacity of the aircraft electric power system will be improved effectively. © Copyright 2010.