Water Energy Resource Innovation on the Cavitation Characteristics

Qandil, Mohammad D.; Abbas, Ahmad I.; ElGammal, Tarek; Abdelhadi, Ahmad I.; Amano, Ryoichi S.

doi:10.1115/1.4047885

Water Energy Resource Innovation on the Cavitation Characteristics

Journal Article · Thu Aug 13 00:00:00 EDT 2020 · Journal of Energy Resources Technology

DOI:https://doi.org/10.1115/1.4047885· OSTI ID:1648878

Qandil, Mohammad D. ^[1]; ^[2]; ElGammal, Tarek ^[3]; Abdelhadi, Ahmad I. ^[1]; Amano, Ryoichi S. ^[1]

Univ. of Wisconsin, Milwaukee, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Bradley Corporation, Menomonee Falls, WI (United States)

The main purpose of this study is to numerically correlate the amount of generated vapor over a hydrofoil to the lift and drag coefficients acting on it. As such, cavitation characteristics were investigated of a hydrofoil in the cavitating, sub-cavitating, and non-cavitating flows for different angles of attacks (AoA) with the high upstream flow velocity. The hydrofoil was tested in a square water tunnel with water entering the tunnel at various velocities for each AoA ranges from 9.1 m/s to 12.2 m/s. It was found that lift and drag forces acting on the hydrofoil follow the trend of the experimental data quite closely. While the cavitation can be identified by a unique number (averaged vapor volume fraction), the work done created an inverse correlation between this number and the cavitation number at the same angle of attack. The lift force declines with the increase in the vapor content on the hydrofoil surface, meanwhile the drag force peaks at certain vapor volume fraction, and then, a huge reduction occurs with the considerable decrease in the corresponding cavitation number. A fourth-order correlation generated between the lift to drag (L/D) and the cavitation number (σ). It was found the lift-to-drag ratio decreases by the formation of the cavitation over the hydrofoil, thus causing a drop in the efficiency of the turbomachines.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1648878

Journal Information:: Journal of Energy Resources Technology, Journal Name: Journal of Energy Resources Technology Journal Issue: 2 Vol. 143; ISSN 0195-0738

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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