http://www.iaeme.com/IJMET/index.asp 1434 editor@iaeme.com International Journal of Mechanical Engineering and Technology (IJMET) Volume 9, Issue 10, October 2018, pp. 1434–1443, Article ID: IJMET_09_10_147 Available online at http://www.iaeme.com/ijmet/issues.asp?JType=IJMET&VType=9&IType=10 ISSN Print: 0976-6340 and ISSN Online: 0976-6359 © IAEME Publication Scopus Indexed INFLUENCE OF INCREASING NUMBER OF BLADES ON THE INTERNAL STRUCTURE OF HYDRO PROPELLER Mohammed K. Khashan and Amjed AL-Khateeb Department of Aeronautical techniques, Najaf technical institute Al-Furat Al-Awsat Technical University, Najaf, Iraq Ali H. Mutaib and Essam O. Al-Zaini Department of Aeronautical techniques, Engineering Technical College of Al-Najaf Al-Furat Al-Awsat Technical University, Najaf, Iraq ABSTRACT Ships and underwater vehicles such as submarines and torpedoes use hydro- propellers to generate propulsive force in order to move in water, hydro-propeller is a component used to convert the rotational motion to thrust, as a result of pressure difference between face side and back side of blade surface. According to this effect the water will accelerate behind the propeller blades, the pressure difference acts the internal structure of propeller and this will produce a deformation effect on propeller blades and also Intensification of the dynamic and static stresses. All of these will negatively affect the hydrodynamic performance of the propeller. The aim of this research is to investigate numerically, by using ANSYS-Structural 16.1 software, the effect of increasing blades number on the propeller structure and to study the interaction between these stresses on propeller performance. The results showed that the number of propeller blades negatively affect internal structure of propeller. The mechanical stresses like Von-Mises stress, Equivalent elastic strain and deformation will increase as the propeller blades number increases to record maximum value in propeller with five blades. Furthermore the mechanical stresses concentrated in blades roots region where the blades are fixed in propeller hub. Keyword head: Propeller structural analysis, Propeller blade deformation, Numerical study, CFD analysis, Mechanical performance of hydro-propeller. Cite this Article Mohammed K. Khashan, Amjed AL-Khateeb, Ali H. Mutaib and Essam O. Al-Zaini, Influence of Increasing Number of Blades on the Internal Structure of Hydro Propeller, International Journal of Mechanical Engineering and Technology, 9(10), 2018, pp. 1434–1443. http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=9&IType=10