Abstract:Compared to traditional structure, lateral facing air-intake system is much more sensitive to the environmental conditions, such as air-intake velocity or directions, which have significantly impact on overall performance. This paper investigated experimentally the influence of air-intake direction on lateral facing air-intake system in a large marine gas turbine. Ascale model of the whole intake system was built, loss parts were also included, such as filter, plenum chamber and silencer. Five different air-intake directions were simulated with corresponding intake guide device. Detailed flow field measurements were made on seven critical planes in all the cases. The results indicate that air-intake direction significantly affects the overall performance of air-intake system. The total pressure loss is minimum when the air-intake direction is vertical to the shutter. Front parts of the system, such as shutter, filter and plenumchamber, are much more influenced by air-intake direction than the back parts. Meanwhile, flow distortion on the outlet plane of thie system is also influenced by air-intake direction, but the variation tendency is almost opposite to that of total pressure loss. Based on the experimental results, it can be concluded that all the total pressure loss, the distortion and the engine power loss can meet the design requirement under different air-intake directions.