CFD analysis of unsteady propeller performance operating at different inclined shaft angles for long-tail boat in Thailand

Abstract

Inclined shaft propeller arrangements are demonstrated in the high-speed boat. The flow field around the propeller blades with inclined shaft propeller is unsteady due to the cross-flow component from the influx of the shaft direction which complicated more than the straight shaft propeller condition (without inclined shaft propeller). Therefore, realistic flow around inclined shaft propeller is important to the actual efficiency of propeller. In addition, propeller characteristics such as the pitch, skew and rake are influences to propeller performance, maybe not done in design condition which is different from the straight shaft propeller. This paper offers the investigation of unsteady propeller performance with operating the different inclined shaft angle conditions for Long-Tail Boat (LTB) using a Reynolds Averaged Navier-Stokes (RANS) solver. The unsteady calculations are conducted by inclined flow conditions. The computational results of propeller performance and pressure distribution on the suction and pressure sides at the blades of time-accuracy have been compared to each other including the wake effect behind the propeller. The results can be applied to adjust the inclined shaft angle of the boat.

Effects of a long-drive shaft on flow field around a high-speed boat propeller in Thailand using CFD

“…The turbulence intensity and turbulence viscosity ratio at the boundary inlet is defined as equal to 1 %. The dimensions of the mathematical domain are presented in Table 2, which has been studied by Kaewkhiaw (2020). The grid quality of computational domains with inclined shaft propellers in full-scale propeller size for Long-Tail Boats was investigated by Kaewkhiaw (2021).…”

“…The literature reviews did not find any previous research on long-drive shaft propellers, because they are only used for Long-Tail Boats, which is a local boat in Thailand. However, it was found that Kaewkhiaw (2018Kaewkhiaw ( , 2020 studied the steady and unsteady propeller performance operating at different yaw angles and the inclined shaft angle conditions for the Long-Tail Boat. It was intended to investigate the suitability of working conditions of the Long-Tail Boat.…”