Thesis
Unified approach to jet installation noise using mathematical modelling and spectral analysis of jet turbulence
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2024
- Thesis identifier
- T16849
- Person Identifier (Local)
- 201970615
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- The acoustic analogy has been used as a method of jet noise prediction for several decades. Goldstein’s generalised acoustic analogy showed that jet noise can be formulated as the product of a spectral tensor which contains the jet turbulence statistics and the propagator which controls how the acoustic waves propagate to the far field. In this approach the turbulence enters through the spectral tensor (linearly related to the space-time Fourier transform of the Reynolds stress auto-covariance). The Afsar et al (2011) formulation for heated jets in axisymmetric turbulence showed that the generalised analogy can be related to 11 independent components of the spectral tensor. The main objective of this thesis is to carry out a detailed numerical analysis of the turbulence statistics using LES of four jets. We investigate various turbulence approximations in the spectral tensor model and its impact on acoustic predictions. Our aim is to discover whether universality of turbulence scales exists across Mach number and jet temperature ratio. We found that for jet noise predictions, universality was confirmed across acoustic Mach number, when the jet temperature ratio was fixed. Notably, universality was also found across jet temperature ratio at the peak frequency (St = 0.2, θ = 30). We also find several approximations can be made in the spectral tensor calculation to reduce computational complexity. This thesis also considers edge noise, utilising parallel programming across a graphic processor unit to increase computational speed of the predictions as well as improved analytical modelling including optimisation to obtain more accurate acoustic predictions across a range of subsonic Mach number. These results are then combined with the jet noise results to investigate installation effects.
- Advisor / supervisor
- Minisci, Edmondo
- Koshuriyan, Zamir
- Resource Type
- DOI
Relazioni
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PDF of thesis T16849 | 2024-03-15 | Pubblico | Scaricare |