Research On The Design Of The Ram Turbine Generator System For Supersonic Vehicle

In recent years, with the increasing position of the supersonic vehicle in the field of national defense and military field, the research on it has drawn more and more attention. Because of the advantages of light in weight, simple structure and high efficiency, the ram turbine generator system has become the best choice to provide electric power for the high speed aircraft airborne equipment. This article studied overall structure scheme analysis, main component design and optimization of core components of the system by numerical simulation and experimental method. The main work and conclusions are as follows:1. In this paper, the overall scheme and structure design of the ram turbine generator system was completed firstly. Moreover the design process of main structural components, including the magnetic circuit structure of the high speed generator, the cooling and lubricating system and main aerodynamic components, are described in detail. In the design process of aerodynamic components, the matching between the various components should be considered. The cooling and lubricating system effectively solved the problem of the heat dissipation of the generator and the lubrication of the bearing. The throttle device has the advantages of compact structure, high precision, short response time and safe and reliable operation.2. Numerical simulation and flow field analysis for aerodynamic components were carried by the method of CFD, and the working characteristics of each part were got. Then in order to judge the matching characteristics between turbine and volute, the combined numerical simulation was carried out. In order to provide reference for the selection of control strategies, the combined numerical simulation of turbine and throttling set was carried out. In order to verify the accuracy of the numerical simulation, the test of the throttling set was carried out.3. The overall test of the ram turbine generator system had been carried out on the ground. We built the test bench, formulate the plan of test and measurement plan in detail, detect the vibration of the system. The performance of the system under low load condition and verify the structural strength of the component by experiment are obtained.4. The optimization of turbine was studied. How the meridional expansion affect the performance of the two-stage micro transonic axial turbine was analyzed under the condition of the turbine outlet area remains the same. The results show that different expansion angle on the end walls have a certain influence on the static pressure distribution of inlet and outlet of the turbine nozzle, the Mach number distribution in the nozzle throat, rotor inlet angle and shock wave intensity at turbine outlet at design point. There exists an optimum combination of upper and lower walls expansion angle which improve the performance of turbine in design and non design points. Compared with the worst combination, the best combination can improve the entropy efficiency of 0.7% and the power of 0.465 kW in the design point.