Numerical Simulation Of The Marine Gas Turbine Exhaust Volute

The structure and the aerodynamics performance of gas turbine exhaust volute is one of the important aspects when the gas turbine is installed on the naval vessels. It requires more even airflow and less pressure loss. At the same time, the dimension of the exhaust volute must be as small as possible, so that the gas turbine can work well. In order to offer reliable basis, in this article a few exhaust volute models of gas turbine are designed and some numerical simulations are carried on according to the requirements mentioned above. A box exhaust volute is employed because its axis dimension is smaller than that of the reference exhaust volute which is an elbow exhaust volute. The axis dimension of box exhaust volute is small which is important to the utilization of the limited space in the naval vessels.In this article the numerical simulation is used in stead of the traditional research method of experimentation because the latter one consumes a lot of material resources and financial resources. The flow fields of the volute exhausts of different dimension have been calculated by the means of numerical simulation. According to the characteristics of the flow fields, unreasonable structures have been improved to obtain the exhaust volute with the better performance.By the numerical simulation of the flow field, a gas turbine exhaust volute with better aerodynamics performance is found. Compared with the reference exhaust volute, its pressure loss is smaller than that of the reference exhaust volute and the velocity of the exhaust outlet is more even than that of the reference exhaust volute. What is more significant is that its axis dimension is much smaller than that of the reference exhaust.