Comparison of Prediction Methods on Jet Noise Shielding and Reflection Effects

Abstract

Jet noise is one of the major sources of takeoff and landing noise at airports. The noise is also known to sometimes cause more complicated jet noise-airframe interference problems. Several prediction methods have been proposed to assess this issue in the past. However, the advantages and disadvantages of these methods have not been investigated sufficiently. In this study, three different approaches (i.e., an empirical method, a theoretical method, and an analytical method using the boundary element method) are utilized to predict the effects of a single jet with a horizontal tail. These results are compared with experimental data to clarify the difference. Whereas the results show that none of the three methods can predict noise effects perfectly, we extracted information that can be used as a guideline to choose an appropriate method in the future.