Axisymmetric impinging jet excited by a synthetic jet system

Trávníček, Z.; Němcová, Lucie; Kordík, Jozef; Tesař, Václav; Kopecký, Václav

doi:10.1016/j.ijheatmasstransfer.2011.09.015

Cited by 38 publications

(26 citation statements)

References 51 publications

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“…20% (in case of t/T mod = 0.4). In comparison with [11], where the SJs actuation caused periodic zig-zag vectoring of the primary jet towards left and right direction, in our case due to the actuation frequency and its modulation no or only small bifurcation is manifested. The change of the jet shape and formation and development the vortexes are visible.…”

Section: 3mentioning

confidence: 61%

“…This paper continues research in [11]. In that work the used experimental setup consisted of the primary, continuous axisymmetric nozzle equipped with four synthetic jet (SJ) actuators placed around its exit orifice, visibly in Fig.…”

Section: Experimental Setup and Techniquementioning

confidence: 82%

“…SJ actuators were fed with sinusoidal signal with frequency of 41, 82 and 164 Hz. In this paper, the experimental setup described in [11] is used. In our research, the primary flow is controlled with two SJ actuators working also in a bifurcated mode, but the actuators were fed with modulated sinusoidal signal (signal parameters are described in chapter 3).…”

Section: Experimental Setup and Techniquementioning

confidence: 99%

“…Control of a primary flow with the synthetic jets used for the heat/mass transfer distribution is studied in [11].…”

Section: Introductionmentioning

confidence: 99%

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Active control of continuous air jet with bifurcated synthetic jets

et al. 2017

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Abstract:The synthetic jets (SJs) have many significant applications and the number of applications is increasing all the time. In this research the main focus is on the primary flow control which can be used effectively for the heat transfer increasing. This paper deals with the experimental research of the effect of two SJs worked in the bifurcated mode used for control of an axisymmetric air jet. First, the control synthetic jets were measured alone. After an adjustment, the primary axisymmetric jet was added in to the system. For comparison, the primary flow without synthetic jets control was also measured. All experiments were performed using PIV method whereby the synchronization between synthetic jets and PIV system was necessary to do.

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Section: 3mentioning

confidence: 61%

Section: Experimental Setup and Techniquementioning

confidence: 82%

Section: Experimental Setup and Techniquementioning

confidence: 99%

“…Control of a primary flow with the synthetic jets used for the heat/mass transfer distribution is studied in [11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Active control of continuous air jet with bifurcated synthetic jets

et al. 2017

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“…Following the previous experience with SJ actuators (Trávníček et al [8][9][10][11][12]), the full scale axial fan was equipped by electrodynamically driven SJ actuators, located at the IGVs. Namely three SJ actuators were built in the fan casing near the IGVs at the expected separation points.…”

Section: Synthetic Jet Actuators and Experimental Methodsmentioning

confidence: 99%

Flow control in axial fan inlet guide vanes by synthetic jets

Cyrus

Trávníček

Wurst

et al. 2013

EPJ Web of Conferences

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Abstract. Tested high pressure axial flow fan with hub/tip ratio of 0.70 and external diameter of 600 mm consisted of inlet guide vanes (IGV), rotor and stator blade rows. Fan peripheral velocity was 47 m/s. Air volume flow rate was changed by turning of rear part of the inlet guide vanes. At turning of 20 deg the flow was separated on the IGV profiles. The synthetic jets were introduced through radial holes in machine casing in the location before flow separation origin. Synthetic jet actuator was designed with the use of a speaker by UT AVCR. Its membrane had diameter of 63 mm. Excitation frequency was chosen in the range of 500 Hz -700 Hz. Synthetic jets favourably influenced separated flow on the vane profiles in the distance of (5 -12) mm from the casing surface. The reduction of flow separation area caused in the region near the casing the decrease of the profile loss coefficient approximately by 20%.

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