A Computational and Experimental Investigation of Serrated Coaxial Nozzles

Page, Gary J.; McGuirk, James J.; Hossain, Mamdud; Hughes, Nicola J.; Trumper, M.

doi:10.2514/6.2002-2554

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…These findings were subsequently supported with more experimental details using acoustic and PIV experiments in the two follow-up studies. A significant number of other experimental and numerical investigations on chevron nozzles have also been conducted by several research groups recently, such as Yan et al [106,105], Eschricht et al [17], Page et al [65], Tinney and Jordan [83], among many others.…”

Section: Circular Coaxial Modified Nozzle Jetsmentioning

confidence: 99%

Dynamics of Jets Issuing from Trailing-Edge Modified Nozzles

New

Tsovolos

Tsioli

2015

Fluid Mechanics and Its Applications

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This chapter will elaborate upon the fundamental flow behaviour associated with vortex-rings and jets issuing from nozzles, where the nozzle trailingedges or lips are physically modified with selected geometries. This technique represents a passive but robust form of manipulating the underlying vortex-ring and jet circulation, such that improvements to their entrainment and mixing characteristics can be achieved. Implementations of simple inclined, hybrid inclined, notched, crown-shaped, chevron and stepped nozzles, as well as some of their implementations in circular and noncircular jets, single-stream or dual-stream coaxial jets, will be discussed as part of the overall understanding. In particular, recently observed influences of trailing-edge modifications upon the axis-switching behaviour of noncircular jets, as well as their relationships with coaxial jet flow parameters such as the velocity-and area-ratios will be presented. On top of key flow physics insights in terms of how the nozzle trailing-edge geometry will confer distortionary effects upon the basic vortex structures, the impact of such nozzles upon jet mixing efficacies will be discussed as well.

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Section: Circular Coaxial Modified Nozzle Jetsmentioning

confidence: 99%

Dynamics of Jets Issuing from Trailing-Edge Modified Nozzles

New

Tsovolos

Tsioli

2015

Fluid Mechanics and Its Applications

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“…It is known that jet noise is the most prominent source at the full power take off condition for high bypass ratio turbofan engines [1] , and therefore it is very imperative and necessary to predict and reduce it. Reducing the jet noise using mixing enhancement is not a new idea.…”

Section: Introductionmentioning

confidence: 99%

Study of Jet Noise Reduction on Separated Exhaust System Using Chevron Nozzles

Shao

et al. 2014

AMR

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The jet noise reduction of chevron nozzles was investigated on high bypass ratio turbofan engine separated exhaust system using both computational predictions and scale model experiments. Six different exhaust nozzles are designed including one baseline nozzle and five different chevron nozzles. The jet noise experiments were carried out in the anechoic chamber. Tam and Auriault’s jet noise prediction theory and MGBK theory were used to predict the noise spectra of different exhaust nozzles. The results show that the far-field noise spectra as well as the noise reduction benefits of chevrons are predicted correctly by the two theories although some discrepancies occur at the high frequency range, and Tam and Auriault’s jet noise theory can give relatively more accurate prediction results. chevron nozzles reduce jet noise at the low frequencies, but increase it at high frequencies.

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