The Eulerian–Lagrangian Approach for the Numerical Investigation of an Acoustic Field Generated by a High-Speed Gas-Droplet Flow
| Autor: | Matvey Kraposhin, Andrey Epikhin, Valeriia G. Melnikova |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Convection
particle quasi-gas dynamic equations 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics jet 0103 physical sciences water droplets aeroacoustics Mass flow rate OpenFOAM Water injection (engine) 0101 mathematics Fluid Flow and Transfer Processes Physics QC120-168.85 Jet (fluid) Mechanical Engineering Mechanics Eulerian–Lagrangian approach Condensed Matter Physics Breakup 010101 applied mathematics Noise Descriptive and experimental mechanics Flow (mathematics) Aeroacoustics Thermodynamics QC310.15-319 |
| Zdroj: | Fluids, Vol 6, Iss 274, p 274 (2021) Fluids Volume 6 Issue 8 |
| ISSN: | 2311-5521 |
| Popis: | This paper presents the Eulerian–Lagrangian approach for numerical modeling of high-speed gas-droplet flows and aeroacoustics. The proposed hybrid approach is implemented using the OpenFOAM library and two different methods. The first method is based on a hybrid convective terms approximation method employing a Kurganov–Tadmor and PIMPLE scheme. The second method employs the regularized or quasi-gas dynamic equations. The Lagrangian part of the flow description uses the OpenFOAM cloud model. Within this model, the injected droplets are simulated as packages (parcels) of particles with constant mass and diameter within each parcel. According to this model, parcels moving in the gas flow could undergo deceleration, heating, evaporation, and breakup due to hydrodynamic instabilities. The far-field acoustic noise is predicted using Ffowcs Williams and Hawking’s analogy. The Lagrangian model is verified using the cases with droplet evaporation and motion. Numerical investigation of water microjet injection into the hot ideally expanded jet allowed studying acoustic properties and flow structures, which emerged due to the interaction of gas and liquid. Simulation results showed that water injection with a mass flow rate equal to 13% of the gas jet mass flow rate reduced the noise by approximately 2 dB. This result was in good coincidence with the experimental observations, where maximum noise reduction was about 1.6 dB. |
| Databáze: | OpenAIRE |
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