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Communication Dans Un Congrès Année : 2017

Assessment of Cavitating Flow Aggressiveness on a Hydrofoil: Experimental and Numerical Approaches

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The aggressiveness of a partial cavity on a hydrofoil in a cavitation tunnel is investigated from a joint numerical and experimental analysis. The numerical approach is based on a homogeneous equilibrium model and a barotropic law for the liq-uid/vapor mixture [1,2] for cold water. The unsteady behavior of the cavity appears in good agreement with experiments although the maximum cavity length is underestimated and the cloud shedding frequency overestimated. The flow aggressiveness is estimated by using the energy approach proposed by Fortes-Patella et al. [3, 4]. The technique predicts a maximum in flow aggressiveness located in the region where the cloud cavity is shed and increases as a power of the flow velocity between 2 and 3. NOMENCLATURE c reference length equal to the chord length, c = 100 mm [mm] c min minimum speed of sound [m/s] E potential energy [J] f shedding frequency [Hz] g pixel gray level at an instant t [-] g mean mean gray level over the span at an instant t [-] h distance perpendicular to the wall [m] i incidence of the hydrofoil [ • ] l maximum cavity length [mm] p v vapor pressure [Pa] p up upstream pressure [Pa] * Address all correspondence to this author. † Institute of Engineering Univ. Grenoble Alpes p pressure in a cell [Pa] P potential power [W] P 3d potential power density [W.m −3 ] P 2d areal potential power density [W.m −2 ] P mean mean aggressiveness intensity [W.m −2 ] St Strouhal number St = f c/V (based on the chord length) or St = f l/V (based on the cavity length) [-] T temperature [ • C] T trans duration of the numerical transient [s] T a analysis duration [s] V flow velocity in the test section [m/s] V vap total vapor volume in the computational domain [m 3 ] V cell volume of a cell [m 3 ] α void fraction, α = (ρ l − ρ)/(ρ l − ρ v) [-] ∆S reference area [m 2 ] ∆t numerical time step ∆t = 0.2 * c/V [s] ∆z width of the central part studied experimentally [mm] ρ l liquid density [kg.m −3 ] ρ v vapor density [kg.m −3 ] ρ mixture density [kg.m −3 ] σ upstream cavitation number in the test section [-] INTRODUCTION For partial cavitation, the cavitating flow aggressiveness is connected to the unsteadiness of the cavity. In particular, Reis-man et al [5] pointed out that the cloud cavity shed by a cavity was responsible for cavitation erosion.
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hal-01631031 , version 1 (05-05-2020)

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Jean-Bastien Carrat, Regiane Fortes Patella, Jean-Pierre Franc. Assessment of Cavitating Flow Aggressiveness on a Hydrofoil: Experimental and Numerical Approaches. ASME 2017 Fluids Engineering Division Summer Meeting, Jul 2017, Hawaii, United States. ⟨10.1115/FEDSM2017-69187⟩. ⟨hal-01631031⟩

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