Parallel Computing Program Development And Numerical Study On Hot Streak/Turbine Blades Interaction

As an important aeroengine hot component, turbine bears both high aerodynamic load and high temperature and pressure gas impact with the variable of high frequency and amplitude. An important way to break through technical obstacle in aeroengine hot component is the further study and application on turbine hot streak management.Based on the theoretical study and related research project, the steady and unsteady aerodynamic parallel computer program MpiTurbo in view of turbine hot streak management technology is developed independently. The code based on Linux operating system platform is compiled in Fortran90 Language and MPI (message passing interface). The arbitrary ratio of hot streak to blade number and turbine cooling gas are considered in this solver, which has flexible expansibility and high parallel computing efficiency.With the guidance of edge-matching theory and MpiTurbo solver, the numerical simulation is carried about the influencing factors and their action law of turbine hot streak management.Firstly, the number of hot streak to each turbine blade (including HP stationary blade, HP rotating blade and LP stationary blade) is set as 1:1:2:1. Based on this condition, the influence law of temperature distribution, circumferential position, spanwise location, temperature ratio, dimension of inlet hot streak and clocking position of high/low pressure stator on turbine hot streak transfer behavior are systematically analyzed. It shows obvious regularity on the turbine inlet hot streak transfer behavior, which influences the turbine inner temperature distribution directly.The number of hot streak to each turbine blade is then set as 4:5:10:5. Due to the effect caused by the interaction among different blade passages and the hot streak relative position inconsistency, the action law of hot streak transfer and turbine temperature distribution is further analyzed. Under multi channel situation, it is shown that the general trend of turbine hot streak transfer is basically identical with that of one channel, while the static temperature distribution of turbine low pressure stator has many differences with that of one channel.Finally, the film cooling is used to prevent overheating in the turbine HP rotator. According to the hot streak transfer behavior and the turbine inner temperature distribution feature, a primary evaluation using source terms simulation is done. It shows remarkable difference between steady and unsteady simulation. Besides, the necessity of unsteady numerical simulation in the film cooling scheme design is revealed.An effective means of turbine hot streak management and film cooling layout analysis is supplied in this work. Turbine blade interaction and the interaction mechanism of hot streak, blade and cooling gas are also deeply researched. It is an important process toward turbine hot streak management and cooling layout design technique.