The calculation of ground water transit times is one important factor in ground water protection. In this paper, we present an analytical solution for the transit time for a Dupuit-type flow system applicable to saturated flow through a horizontal leaky aquifer discharging to a downgradient fixed-head boundary under steady-state conditions. We investigate the influence of leakage when comparing...

Rotor tip-clearance induced noise, both in the form of rotor self noise and rotor-stator interaction noise, constitutes a significant component of total fan noise. Innovative yet cost effective techniques to suppress rotor-generated noise are, therefore, of foremost importance for improving the noise signature of turbofan engines. To that end, the feasibility of a passive porous treatment strat...

The economic and environmental losses due to serious leakage in the urban water supply network have increased the effort to control the water leakage. However, current methods for leakage estimation are inaccurate leading to the development of ineffective leakage controls. Therefore, this study proposes a method based on the blind source separation theory (BSS) to calculate the leakage of water...

In the typical structure of a turboshaft aero-engine, mass flow cooling air in rotor-stator cavity is controlled by inlet seal labyrinth. This study focused on swirl and heat transfer characteristics with considerations thermal deformation effect. A numerical framework was established integrating conjugate (CHT) analysis structural finite element method (FEM) to clarify two-way aero-thermo-elas...

Turbomachinery miniaturization has been an emerging research field during the last decades and, especially, micro-scale radial compressors are becoming increasingly relevant due to development of high-speed electric motors. They can be found in a wide range applications such as micro gas turbines, aerial unmanned vehicles propulsion, fuel cells and even medical ventilators. Furthermore, use cen...