Comprehensive Calculation And Performance Analysis Of Gas Turbine Reversible Power Turbine

Gas turbine technology trends to be maturing now, but the problem of which not being able to reverse directly remains resolve. In the field of marine, most ships reverse by adjustable pitch propellers, which limit turbine power and increases navigational resistance and maintenance costs. This paper designs a directly reversible turbine – based on a four-stage turbine, which is added a single-stage turbine to achieve the goal of direct reverse for the turbine. The reversible turbine is external to the four-stage turbine, and they share a turbine shaft to work. The rotor of the reversible turbine is connected with the last stage rotor of the four-stage turbine, and the double-layer blade is formed by the intermediate ring. The upper and lower parts of the double-layer blade have opposite profile shape, which allows the redesigned turbine to rotate positively and reversely. This paper uses CFD software to simulate the work conditions of the reversible turbine. The flow loss in the internal flow field of the redesigned turbine and the four-stage was analyzed in this paper, and find that the flow separation is the main factor to reduce efficiency of the reversible turbine.