A phase averaged PIV study of circular and non-circular synthetic turbulent jets issuing from sharp edge orifices

Hashiehbaf, A.; Romano, G. P.

doi:10.1016/j.ijheatfluidflow.2020.108536

Cited by 10 publications

(2 citation statements)

References 31 publications

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“…In the literature, the centerline velocity of the free steady jet usually starts to decay in the range of x/D=5-7 [55][56][57][58][59][60]. The centerline velocity of the pulsed jet usually starts to decay earlier than the steady jet [28,61]. Figure 5 shows that the centerline velocity of the jet starts to decay at a place very close to the jet exit.…”

Section: Simple Pulsed Jetmentioning

confidence: 91%

Parametric study of a frequency-modulated pulse jet by measurements of flow characteristics

2021

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Recently, pulsed jet actuators have been discovered as an efficient and promising technique for flow separation control. In this paper, a systematic experimental investigation is carried out using a flow control approach, in order to study the flow field characteristics of a baseline single pulsed jet actuator, under different excitation conditions. The findings are used to provide a better understanding of pulsed blowing actuator operation and the associated flow physics. In these experiments, two types of signal waveforms have been implemented to produce the pulsed excitation of jet; a simple squarewave excitation signal for the first case and a burst modulated excitation signal for the second case. All measurements were conducted using a single hot-wire system to an axial distance x/D30 along the centerline. The effects of electrical parameters on properties of a single pulsed jet, including the excitation frequency from 10 up to 220 Hz and the duty cycle from 15% up to 80% for the first case, and different combinations of the carrier frequency and the modulating frequency for the second case have been studied. These measurements revealed a significant dependence of mean centerline velocity and turbulence intensity to excitation signal, frequency, and duty cycle. The statistical flow properties, such as mean centerline velocity decay and turbulence intensity distribution of pulsed jets are quantified and compared together over a wide range of pulsing parameters. This investigation aids in designing and optimizing flow control actuators in aerodynamics and combustion chambers. NomenclatureRECEIVED

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Section: Simple Pulsed Jetmentioning

confidence: 91%

Parametric study of a frequency-modulated pulse jet by measurements of flow characteristics

2021

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“…The atomization efficiency is very less and it leads to the reduced combustion efficiency of the system. Attempts have been made by the researchers to address these issues by varying the injector orifices shape from circular to non-circular orifices in addition with an appropriate L/D (length to diameter) ratio [10][11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Studies of Jet A1 Fuel Atomization Through Non Circular Orifices

Pooja,

Kumar

2023

Def. Sc. J.

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The performance of the liquid rocket engine depends on the atomization behavior of the fluid being injected into the combustion chamber. Generally, a plain injector with a circular orifice has been used in the injector, but it has the disadvantage of having a low spray cone angle. The breakup length, mean droplet diameter, and Sauter mean diameter is also higher. Thus, to overcome these drawbacks, non-circular orifices have been utilized in the present study. The shapes used for non-circular orifices are semi-circular and plus. The results obtained with the non-circular orifice is compared with the circular orifices of the same area ratio. The working fluid used for the studies is Jet A1 fuel. Studies were also conducted with different L/D ratios by choosing an effective orifice length to reduce the upstream losses. The axis-switching phenomena were observed with the semi-circular as well as with the plus jets. The mean droplet size of the circular jets was more prominent compared to non-circular jets, and the Sauter mean diameter of non-circular jets droplets was smaller than that of the circular jet droplet. The spray cone angle has increased by 290% for plus jets and 30% for semi-circular jets compared to circular jets.

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Lagrangian analysis on structure evolution and mass transport of circular and noncircular turbulent synthetic jets

Wang

Feng²,

Xu³

2022

Acta Mech. Sin.

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A phase averaged PIV study of circular and non-circular synthetic turbulent jets issuing from sharp edge orifices

Cited by 10 publications

References 31 publications

Parametric study of a frequency-modulated pulse jet by measurements of flow characteristics

Parametric study of a frequency-modulated pulse jet by measurements of flow characteristics

Studies of Jet A1 Fuel Atomization Through Non Circular Orifices

Lagrangian analysis on structure evolution and mass transport of circular and noncircular turbulent synthetic jets

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