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Aeroacoustics of low Mach number flows : fundamentals, analysis, and measurement /
Focusing both on the necessary mathematics and physics, this resource provides a comprehensive treatment of sound radiation from subsonic flow over moving surfaces, which is the most widespread cause of flow noise in engineering systems. --
| Clasificación: | Libro Electrónico |
|---|---|
| Autores principales: | , |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
| Publicado: |
London :
Academic Press,
[2017]
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| Temas: | |
| Acceso en línea: | Texto completo Texto completo |
Tabla de Contenidos:
- Front Cover; Aeroacoustics of Low Mach Number Flows: Fundamentals, Analysis, and Measurement; Copyright; Dedication; Contents; Preface; Part 1: Fundamentals; Chapter 1: Introduction; 1.1. Aeroacoustics of low Mach number flows; 1.2. Sound waves and turbulence; 1.3. Quantifying sound levels and annoyance; 1.4. Symbol and analysis conventions used in this book; References; Chapter 2: The equations of fluid motion; 2.1. Tensor notation; 2.2. The equation of continuity; 2.3. The momentum equation; 2.3.1. General considerations; 2.3.2. Viscous stresses; 2.4. Thermodynamic quantities.
- 2.5. The role of vorticity2.5.1. Crocco's equation; 2.5.2. The vorticity equation; 2.5.3. The speed of sound in ideal flow; 2.6. Energy and acoustic intensity; 2.6.1. The energy equation; 2.6.2. Sound power; 2.7. Some relevant fluid dynamic concepts and methods; 2.7.1. Streamlines and vorticity; 2.7.2. Ideal flow; 2.7.3. Conformal mapping; 2.7.4. Vortex filaments and the Biot Savart law; References; Chapter 3: Linear acoustics; 3.1. The acoustic wave equation; 3.2. Plane waves and spherical waves; 3.3. Harmonic time dependence; 3.4. Sound generation by a small sphere.
- 3.5. Sound scattering by a small sphere3.6. Superposition and far field approximations; 3.7. Monopole, dipole, and quadrupole sources; 3.8. Acoustic intensity and sound power output; 3.9. Solution to the wave equation using Green's functions; 3.10. Frequency domain solutions and Fourier transforms; References; Chapter 4: Lighthill's acoustic analogy; 4.1. Lighthill's analogy; 4.2. Limitations of the acoustic analogy; 4.2.1. Nearly incompressible flow; 4.2.2. Uniform flow; 4.3. Curle's theorem; 4.4. Monopole, dipole, and quadrupole sources; 4.5. Tailored Green's functions.
- 4.6. Integral formulas for tailored Green's functions4.7. Wavenumber and Fourier transforms; References; Chapter 5: The Ffowcs Williams and Hawkings equation; 5.1. Generalized derivatives; 5.2. The Ffowcs Williams and Hawkings equation; 5.3. Moving sources; 5.4. Sources in a free stream; 5.5. Ffowcs Williams and Hawkings surfaces; 5.6. Incompressible flow estimates of acoustic source terms; References; Chapter 6: The linearized Euler equations; 6.1. Goldstein's equation; 6.2. Drift coordinates; 6.3. Rapid distortion theory; 6.4. Acoustically compact thin airfoils and the Kutta condition.
- 6.5. The Prantl-Glauert transformationReferences; Chapter 7: Vortex sound; 7.1. Theory of vortex sound; 7.2. Sound from two line vortices in free space; 7.3. Surface forces in incompressible flow; 7.4. Aeolian tones; 7.5. Blade vortex interactions in incompressible flow; 7.6. The effect of angle of attack and blade thickness on unsteady loads; 7.6.1. The effect of angle of attack; 7.6.2. The effect of airfoil thickness; References; Chapter 8: Turbulence and stochastic processes; 8.1. The nature of turbulence; 8.2. Averaging and the expected value.