Air-conditioned Jet Turbine Plane Cascade Aerodynamic Performance

Aero engines are called as"the heart of aircraft", because they provide propulsion and power for flying vehicles and airborne devices. Along with the developing of aeronautic technology, aero engine shall fulfill higher requirements in thrust ratio, reliability, life, fuel consumption and life-time cost. It is one of the main methods which can enhance the thrust ratio of a engine that increasing the turbine entrance temperature (TET). Unfortunately, a higher TET means worse working condition of the turbine. It requires better materials and a better cooling method, or the turbine can not work normally. In history, the contribution of advanced cooling method is more significant than that of the progress of materials.Film cooling is a wildly used method. Cooling air enters the main flow passage and mixes with the gas stream through holes on the surface of turbine blade, and harms the aerodynamic performance of the turbine. Therefore, it is essential that study the influence of air film on the aerodynamic performance of turbine. From experiences, main factors include positions of holes, the injection angle and the mass flow of cooling air.Linear cascade test with cooling air injection is an economic, short-period way to study film cooling. There is rarely a research about super-trans-sonic linear turbine cascade test for studying the influence of film cooling in China, but a great many works in calculation and CFD simulation. This paper tries give some research in this field. Firstly, a super-trans-sonic turbine cascade test is designed and performed. Then, a study on the influence of film cooling is performed by analyzing the result of the test. This paper is going to provide evidence for turbine vane and blade design.