Investigating the phenomenon of cavitation and noise emission in marine propellers

Marine propellers are important and vital members that establish a connection between the floating engine and the water, and most of the power generated by them turns into the forward movement of the floating. The phenomenon of cavitation is one of the important issues in the design of floating propellers, and it can be mentioned as a criterion for design, because if this unwanted phenomenon occurs, the acoustic benefits of the ship's propeller will be reduced, and in some cases irreparable damage will occur. Sees. In the design of vessels, noise creates relatively different limitations, which are discussed in two areas, firstly, the effect of noise on the sensors and systems of internal weapons, and secondly, the effect of this noise around the ship, which is one of the factors of identification by enemy identification systems. In subsurface floats, the most important parameter in propeller design is the amount of concealment and reduction of the emission noise level. The vortex of the tip of the propeller blade can be introduced as one of the strongest sources of noise generation, reduction of thrust and efficiency, and the cause of induced vibrations on the body. Therefore, the geometric factors affecting the blade tip geometry should be optimized to achieve this goal. In this research, an attempt is made to introduce the phenomenon of cavitation and examine its disadvantages.