船舶燃气轮机双通道进气系统流场特性研究

A detailed numerical simulation on the flow field of a double-channel intake system is carried out for marine gas turbine by using the method of automatic flow distribution. The flow distribution law of the double-channel intake was explored, the characteristics of the full flow field are analyzed and the system performance is evaluated under the static wind condition of 1.0 state of the sea. The results show that the design of two channel intake system can ensure the flow distribution of upper and lower intake chambers is reasonable, obtain uniform flow in the intake chamber and improve the condition of airflow rush in the shaft. For the total pressure loss of the system, the flow loss accounts for about 47.2%, while the total pressure loss of components accounts for about 52.8%. Additionally, the loss of primary air filter accounts for 45.9% of the total pressure loss of components, which is the main component to produce the total pressure loss. If possible, perforated plate of muffler and shaft shapes can be further optimized to reduce the flow loss. The flow uniformity coefficient of cooling pipe outlet reaches 0.99, which meets the requirement of uniformity degree. When the design length of the volute is greater than 0.6 times of the characteristic length, the flow velocity and total pressure meet the requirement of uniformity. It can be considered that the outlet air flow is uniform.