Acoustic characteristics of impingement cooling sheets; effect of bias-grazing flow interaction on the liner impedance in a thin annulus

Saldern, Jakob G. R. von; Eck, Mattias Ettore Giulio; Beuth, Jan Paul; Ćosić, Bernhard; Oberleithner, Kilian

doi:10.1016/j.jsv.2022.116818

Journal of Sound and Vibration

2022

DOI: 10.1016/j.jsv.2022.116818

|View full text |Cite

Acoustic characteristics of impingement cooling sheets; effect of bias-grazing flow interaction on the liner impedance in a thin annulus

Jakob G. R. von Saldern¹,

Mattias Ettore Giulio Eck²,

Jan Paul Beuth³

et al.

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2023

2024

Publication Types

Select...

Article3

Relationship

Self Cite0

Independent3

Authors

Journals

Cited by 3 publications

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Low-frequency still-air acoustic inertia of inclined circular aperture in an infinite flat plate of finite thickness

Su,

Chen,

Yang

2024

Journal of Sound and Vibration

View full text Add to dashboard Cite

Low-frequency still-air acoustic inertia of inclined circular aperture in an infinite flat plate of finite thickness

Su,

Chen,

Yang

2024

Journal of Sound and Vibration

View full text Add to dashboard Cite

Thermoacoustic Characterization of a Premixed Multi Jet Burner for Hydrogen and Natural Gas Combustion

Beuth,

Reumschüssel,

von Saldern

et al. 2023

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

In this study, the acoustics and flame dynamics of a prototype multi jet burner with 19 individual mixing tubes for operation with pure hydrogen and pure natural gas are experimentally investigated. The burner transfer matrix of the jet burner is determined from experimental data and acoustic network modeling, showing very good agreement. A comparison of the flame dynamics of the two fuels considering mass flow and equivalence ratio variation reveals that the flame transfer functions (FTFs) are dominated by a convective mechanism originating from the upstream end of the mixing tubes where the fuel is injected. Consequently, these are most likely fluctuations in the equivalence ratio that feature two characteristic time scales: the convection time in the mixing tubes and along the flame. The overall qualitative shape of the FTFs for hydrogen and natural gas at equal thermal power is found to be similar, with the dynamics of the natural gas flames being more responsive to acoustic excitation. Distinctly less pronounced phase decays are observed for hydrogen compared to natural gas operation. Moreover, the FTFs for H2 are found to change only slightly across the considered range of equivalence ratios. At the same time we observe only small changes in the corresponding static flame shapes. These observation are consistent with the hypothesis of a dominant convective mechanism. In conclusion, the study provides valuable information on the acoustics and flame dynamics of multi jet burners for flexible fuel operation.

show abstract

Experimental and theoretical analysis of nonlinear acoustic characteristics of perforated acoustic liners

Liu,

Guo,

Wang

et al. 2024

View full text Add to dashboard Cite

Perforated acoustic liner is one of the key components commonly used to suppress combustion oscillation in afterburners of military aircraft engines. The acoustic pressure generated by combustion oscillation is relatively high, and the nonlinear characteristics of these liners are significant. This paper employs both experimental and theoretical methods to study the nonlinear absorption coefficient and acoustic impedance of perforated acoustic liners in the range of 0 to 200 Pa. The results indicate that nonlinear effects increase the primary absorption frequency up to 70 Hz as the acoustic pressure amplitude rises from 2 Pa to 200 Pa. For small acoustic pressure amplitudes, it is recommended to use acoustic liners with smaller perforations, whereas for larger amplitudes, the perforation diameter should be increased (d > 4 mm). For liners with a perforation diameter of 1.1 mm, the inclination angle has little effect on the absorption coefficient. When the acoustic pressure amplitude is small, the acoustic liner has an optimal backing cavity height. However, at larger acoustic pressure amplitudes (200 Pa), increasing the backing cavity height is beneficial for the absorption coefficient. When the backing cavity height increased from 20 mm to 130mm, the absorption coefficient more than doubled. The nonlinear acoustic characteristics of perforated acoustic liners can provide valuable insights for the design of anti-vibration screens in afterburners.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Acoustic characteristics of impingement cooling sheets; effect of bias-grazing flow interaction on the liner impedance in a thin annulus

Cited by 3 publications

References 46 publications

Low-frequency still-air acoustic inertia of inclined circular aperture in an infinite flat plate of finite thickness

Low-frequency still-air acoustic inertia of inclined circular aperture in an infinite flat plate of finite thickness

Thermoacoustic Characterization of a Premixed Multi Jet Burner for Hydrogen and Natural Gas Combustion

Experimental and theoretical analysis of nonlinear acoustic characteristics of perforated acoustic liners

Contact Info

Product

Resources

About