Omid Habibi - M.S student of Aerospace Engineering, K. N. Toosi University of Technology,
MohammadMorteza Anbarlooei - PhD student of Aerospace Engineering, K. N. Toosi University of Technology,

Turboprop engines are known for their high propulsive efficiency and low fuel consumption on short-range missions. With growing concerns about the environmental impact of aircraft, airline companies regained interest in turboprop driven aircraft. A major drawback of turboprops is the noise they produce. The dominant noise source of a turboprop engine is the propeller. This article has investigated a propellers noise source. When considering propellers we distinguish two types of noise: ۱) Harmonic ((un)steady loading noise and the thickness noise) or tonal noise, ۲) Broadband noise. The propeller noise theory requires several aerodynamic parameters of the propeller

Turboprop engines- propeller- noise sources- harmonic noise- steady loading noise- thickness noise.