Aero-engine Casing, Inclusive Of Numerical Analysis And Experimental Study

When working, the rotor in air gas turbine engine is rotating at a high speed. When a blade failure (blades of the rotor are torn apart accidentally) occurs, kinetic energy of the projectiles is enormous because of centrifugal force. Although the non-containment incident seldom occurs, once it happens it will lead to serious aviation accident. Accordingly, adopting feasible design approaches to accommodate high-energy blades is necessitated. This paper systematically studies several issues concerning aero-engine casing containment, and verifies the validity of numerical analysis by conducting shooting experiments. In addition, a numerical simulation of a casing of certain model engine as well as a new casing is carried out. This paper mainly focuses on the following aspects:1. Conducting shooting experiments and numerical simulation related:9 shooting experiments are carried out by considering different speeds and different postures of a target, indicating the numerical simulation applied in this domain is feasible.2. The numerical analysis of engine casing containment:Containment performance of certain engine designed in China is numerically analyzed from all perspectives. Containment capability of 1st,2nd and 3rd grades is analyzed initially. The interferences of the fracture and blades remained, along with the impact on containment in a blade failure are studied. The casing containment of a practical engine is thereby evaluated.3. Numerical simulation of casing containmentNumerical simulations for double deck engine casing with titanium alloy inner deck and composite outer deck are conducted. Thickness of containment is obtained by changing the thickness of both inner and the outer deck. The impact on containment of the double deck engine casing is analyzed and compared. Optimized clearance distance which provides a reference for developing slope-engine casing is derived. Improvements of containment by adding flanges to an engine casting are discussed by conducting numerical simulations. Besides, the optimal quantity and location of flanges are obtained to increase containment. The containment of metal casing with Kevlar around the outside is analyzed, which provides a reference for future design.