The powered resonance tube: From Hartmann's discovery to current active flow control applications

Raman, Ganesh; Srinivasan, K.

doi:10.1016/j.paerosci.2009.05.001

Cited by 65 publications

(42 citation statements)

References 125 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Raman et al [13] pointed out that the frequency of HRT can be adjusted to meet the desired value by changing the length of the resonator. In fact, as for HRT, the frequency of the acoustic field can be calculated based on a formula [14] such as:…”

Section: Effect Of Cavity Lengthmentioning

confidence: 99%

“…Applications of ultrasonic atomization have a wide range, from ordinary liquids to molten metals; the throughputs could be from fractional gallons per hour to more than 100 imperial gallons per hour, and the droplet size varied from just above 1 µm to 180 µm with a narrow size spectrum [12,13]. For fuel spray applications, aerodynamic acoustic generators are preferred over other types since the air required for combustion is also used for the generation of sound.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Influence of Acoustic Field Induced by HRT on Oscillation Behavior of a Single Droplet

et al. 2017

View full text Add to dashboard Cite

This paper presents an experimental and theoretical study on the effects of an acoustic field induced by Hartmann Resonance Tube (HRT) on droplet deformation behavior. The characteristics of the acoustic field generated by HRT are investigated. Results show that the acoustic frequency decreases with the increase of the resonator length, the sound pressure level (SPL) increases with the increase of nozzle pressure ratio (NPR), and it is also noted that increasing resonator length can cause SPL to decrease, which has rarely been reported in published literature. Further theoretical analysis reveals that the resonance frequency of a droplet has several modes, and when the acoustic frequency equals the droplet's frequency, heightened droplet responses are observed with the maximum amplitude of the shape oscillation. The experimental results for different resonator cavity lengths, nozzle pressure ratios and droplet diameters confirm the non-linear nature of this problem, and this conclusion is in good agreement with theoretical analysis. Measurements by high speed camera have shown that the introduction of an acoustic field can greatly enhance droplet oscillation, which means with the use of an ultrasonic atomizer based on HRT, the quality of atomization and combustion can be highly improved.

show abstract

Section: Effect Of Cavity Lengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Acoustic Field Induced by HRT on Oscillation Behavior of a Single Droplet

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Hence, the oscillation frequency is determined by the length L of the resonance channel and the propagation velocity -and does not depend on the flow rate passing through the device. The wave propagation process in the resonance channel with one open end is typical of that occurring in a classical Hartmann quarter-wave resonator, the details and governing laws of which are discussed in [13].…”

Section: Figmentioning

confidence: 99%

Strangely behaving fluidic oscillator

Tesař

Peszyński

2013

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. Fluidic oscillators became recently of increasing importance for a number of applications. Two alternative variants have been known so far: (a) feedback-loop configurations, with Strouhal number invariance and (b) configurations with a resonator and frequency not dependent on flow rate. Authors tested an oscillator of seemingly quite conventional two-loop design. Surprisingly, its properties fit to neither of the two established categories. Its Strouhal number is not constant and the frequency of oscillation is flow-rate dependent. There is, so far, no reasonable physical explanation for this strange behaviour.

show abstract

“…[20]. A detailed review of the evolution of the powered resonance tube actuator is given by Raman and Srinivasan [21]. Controlled unsteady mass addition was also used effectively as a flow control actuator.…”

Section: Cavity Flowsmentioning

confidence: 99%

Miniature Shock Tube Actuators for High Speed Flow Control Applications

Ramachandran¹,

Raman²

2013

International Journal of Flow Control

Self Cite

View full text Add to dashboard Cite

There is a critical need to develop reliable high control authority flow control actuators for high speed applications. This paper introduces a novel high control authority actuator in the form of a miniature shock tube actuator. Two types of shock tubes were developed, namely, a single driver and a multiple driver shock tube. Various characterization experiments performed on these shock tubes revealed that they produced high intensity shock waves as predicted by one dimensional shock wave theory. The actuators were then tested for their effectiveness in suppressing cavity noise. The flow control experiments revealed that the shock tubes produced a 12 dB and 10 dB suppression in tonal noise for Mach numbers of 0.6 and 0.8, respectively. These results were compared to a fast acting solenoid valve providing steady and pulsating mass injection. Details of the flow field being controlled were studied using mean velocity and phase averaged measurements. With further development such actuators have potential for use in high speed flow control situations.

show abstract

The powered resonance tube: From Hartmann's discovery to current active flow control applications

Cited by 65 publications

References 125 publications

The Influence of Acoustic Field Induced by HRT on Oscillation Behavior of a Single Droplet

The Influence of Acoustic Field Induced by HRT on Oscillation Behavior of a Single Droplet

Strangely behaving fluidic oscillator

Miniature Shock Tube Actuators for High Speed Flow Control Applications

Contact Info

Product

Resources

About