Data assimilation of flow-acoustic resonance
WebJul 24, 2024 · A novel theoretical model of the internal flow field in multistage axial compressors based on an eigenvalue approach is developed, in order to predict the onset of acoustic resonance in aircraft engines. Using an example high-speed four-stage compressor, it is shown that one of the resultant frequencies is in excellent agreement … WebFeb 22, 2024 · This study aims to detect the unsteady features of the turbulent flow behind a wall-proximity rib using resolvent analysis, based on the mean flow field determined using an adjoint-based data assimilation (ABDA) model.
Data assimilation of flow-acoustic resonance
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WebAcoustic resonance is a phenomenon in which an acoustic system amplifies sound waves whose frequency matches one of its own natural frequencies of vibration (its resonance … WebMar 21, 2024 · Abstract. We measured gas flows exiting large, un-thermostated, gas-filled, pressure vessels by tracking the time-dependent pressure P (t) and resonance frequency fN (t) of an acoustic mode N of the gas remaining in each vessel. This is a proof-of-principle demonstration of a gas-flow standard that uses P (t), fN (t), and literature values of ...
WebAug 31, 2024 · A nonlinear ensemble-variational data assimilation is performed in order to estimate the unknown flow field over a slender cone at Mach 6, from isolated wall-pressure measurements. ... who used a simple random-noise inflow forcing to model the receptivity processes from acoustic waves in a Mach-6 flow. However, significant overpredictions ... WebMay 2, 2024 · This study proposes a sweeping jet as a novel solution to control catastrophic flow–acoustic resonance through a combined experimental and scale-adaptive …
WebACOUSTIC-INDUCED VIBRATION AIV refers to structural vibration excited by intense acoustic pressure in a piping system with vapor flow. The acoustic pressure is usually created from pressure-reducing devices due to high pressure drops and mass flows of vapor services. These acoustic energies excite the pipe wall circumferentially due to WebMay 3, 2024 · This work presents an anisotropic formulation for data assimilation (DA) of turbulent flows using the continuous adjoint system. This DA scheme serves as a tool to …
WebDec 15, 2024 · 1. Introduction. Flow-induced acoustic resonances in closed side branches are excited by an unstable separated shear flow, in which vortex-like structures form at the upstream edge of the branch and impinge at the downstream edge (Uchiyama and Morita, 2024).When the interaction and mutual enhancement between the unstable …
WebAug 18, 2024 · Abstract. This paper presents an experimental investigation of the vorticity shedding and the susceptibility of acoustic resonance excitation for a square tube array with an intermediate tube spacing (i.e., pitch-to-diameter ratio (P/D) of 1.73). The tube array could be rotated about an axis normal to the flow direction so that the effect of the flow … including commasWebFeb 11, 2024 · Abstract. The flow-excited acoustic resonance phenomenon, which is instigated by periodic flow perturbation, leads to the generation of acute sound pressure. In this work, we investigated the characteristics of the flow-excited acoustic resonance for circular finned cylinders with different fin heights. The fin height is expressed as a … incandescent light bulb shapesWebJul 9, 2010 · Here we present further evidence derived from operating experience of full size steam generator and tubular heat exchanger tube banks of which 19 experienced acoustic vibration or acoustic resonance and 27 experienced no vibration or no acoustic resonance within the operating flow range. The present data show that the decisive … including closing costs in loanWebOct 13, 2024 · We model the resonance mechanism underpinning generation of A1 and A2 screech tones in an under-expanded supersonic jet. Starting from the resonance model recently proposed by Mancinelli et al. (Exp. Fluids, vol. 60, 2024, p. 22), where the upstream-travelling wave is a neutrally stable guided-jet mode, we here present a more … incandescent light bulb pictureWebA data assimilation (DA) strategy was developed for accurate prediction of the flow-acoustic resonant fields within a channel-branch system. The challenges of numerical … incandescent light bulb shatterWebJun 1, 2024 · This website requires cookies, and the limited processing of your personal data in order to function. By using the site you are agreeing to this as outlined in our privacy notice and cookie policy. Abstract ... Data assimilation of flow-acoustic resonance. ... including colonWebFeb 1, 2013 · At higher Mach numbers, we observe that the pressure pattern of the acoustic resonance modes (fundamental acoustic modes, first longitudinal acoustic modes, first longitudinal-depth acoustic modes) inside the cavity determines the directivity of the radiated noise. Links with experimental results are finally discussed. including communities fund