Influence of T-Shape Tip Clearance on Energy Performance and Broadband Noise for a NACA0009 Hydrofoil

Abstract

In the present paper, the effect of the proposed T-shape tip on the energy performance, flow patterns and broadband noise sources of a NACA0009 hydrofoil with tip clearance is investigated. The vortex induced by the gap is simulated by means of the SST k-ω turbulence model, and then, the noise generated by dipoles and quadrupoles are analyzed by using the Curle acoustic analogy and Proudman acoustic analogy, respectively. The numerical simulation results agree well with the experimental measurements. Results indicate that three tip shapes, including the half pressure side T-shape model (MPT), the half suction side T-shape model (MST) and the T-shape model (MT), have complex influence on energy performance of the foil. Only the MST model can promote the energy performance of the hydrofoil at all inlet velocities, with the maximum ratio of lift coefficient to drag coefficient increasing by 4.26%. In addition, the ratio of lift coefficient to drag coefficient for MT obviously increases when the inlet velocity is 7.5 m/s, 10 m/s, 12.5 m/s and 15 m/s, and the maximum promotion is 15.21% at 7.5 m/s. The T-shape tip can effectively suppress the tip clearance leakage vortex, which makes the vortex area decrease with a maximum drop of 5.02%. Furthermore, the MPT and MT have good suppression effect on the hydrofoil dipole noise, and reduce the maximum Curle Acoustic Power (AP) of the foil with 2.64% and 3.03%, respectively. The MST model obviously reduces the isosurface area of the Proudman AP by 6.55% for 55 dB.

Energy Characteristics of Full Tubular Pump Device with Different Backflow Clearances Based on Entropy Production

“…The cavitation pattern induced by TLV consists of TLV cavitation, tip corner vortex cavitation, shear layer cavitation, jetting shear layer cavitation, and suction-side-perpendicular cavitating vortices [13,14]. In addition, the increase of tip clearance radius can intensify TLV and result in a decrease of hydraulic performance [15], but the appropriate tip clearance shape can suppress TLV and induced cavitation [16,17]. Most of the research focuses on the influence of backflow clearance and BTC on the hydraulic performance and internal velocity field, but the energy losses caused by CBV and TLV have not been made fully clear to date.…”