Optimization of Gas Turbine Exhaust Volute Flow Loss

Abstract

The exhaust volute is a device that can change the exhaust direction of the ship’s gas turbine to reduce the flow loss of the high-temperature and high-speed turbine exhaust gas in the box-type exhaust volute, thereby improving its power output performance. This paper first investigates the internal flow field characteristics of the exhaust volute via numerical simulation and reveals the main source of the internal resistance loss of the volute. On the premise of not affecting the installation size of the volute and matching it with other components in the cabin, the design scheme of volute bottom shunt and volute chamfer are then optimized in accordance with the flow characteristics inside the volute. Numerical simulation results show that the partial flow structure at the bottom of the volute can effectively improve the low-velocity region and the vortex flow at the bottom of the volute, and the chamfered angle scheme can control the regular expansion and compression of the airflow. When the volute adopts the appropriate chamfer angle and the bottom split-flow structure, the total pressure loss can be reduced by 19.6%, and the static pressure recovery coefficient can be increased by 42.05%.

Keywords

Gas turbine / Exhaust volute / Flow loss / Numerical simulation / Structural modification

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