Experiment Research And Numerical Simulation Of The Marine Gas Turbine IR Suppressor

With the development of IR- guided(infrared-guided)weapons,reduce the radiation of marine gas turbine exhaust is significant to improve the survivability of naval ships. Installation of IR Suppressor is a primary means to reduce the infrared radiation characteristics of turbine exhaust. Therefore,it is important and necessary to study the flow and heat transfer laws within the internal field of IR Suppressor device. These studies can provide a basis for the design and optimization of IR Suppressor, and contributes to the National Defense construction.In this thesis, experimental and numerical simulation methods have been applied in the studies of different kind of IR Suppressor model. Base on the optimal design , some influencing factors on the IR Suppressor performance have been studied, such as the geometry of nozzle and geometry of mixer,the distance between the nozzle and the mixer tube and some other factors.The cooling air ejecting experiment rig was designed according to GB/T 1236-2000. Experiment measurement has been carried out on different models and different installation size of IR Suppressor. The results of ejection ratio, pressure loss and chamber pressure have been obtained through the experiment. Important thermal and aerodynamic parameters of IR Suppressor model were also obtained in hot mass flow experiment. The distribution of velocity and temperature at the outlet cross section of the device has also been studied. Comparing the ejection ratio in cold and hot conditions,we find the method of calculating the ejection ratio in hot condition from the ejection ratio in corresponding cold condition. Meanwhile,numerical simulation has also been performed in IR Suppressor studies. Using CFD software Fluent 6.2.36 study the internal flow field of the device.We analysis the results of experiment and results of numerical simulation,it provides reliable theoretical basis and experimental data to the optimization of infrared suppressor design and to evaluate the performance of the infrared suppressor.