Detailed numerical simulation of primary atomization by crossflow under gas turbine engine combustor conditions

Nambu, Taisuke; Mizobuchi, Yasuhiro

doi:10.1016/j.proci.2020.06.067

Cited by 14 publications

(6 citation statements)

References 9 publications

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“…The crossflow atomization was calculated using a solver based on the S-CLSVOF method (Albadawi et al, 2013). Details of this calculation were described in previous study (Nambu and Mizobuchi, 2021). Figure 11 shows the calculation region, which consists of a straight channel with a rectangular cross section.…”

Section: Numerical Calculation Crossflow Atomization Based On Vof Methodsmentioning

confidence: 99%

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Evaluation of three-dimensional droplet shape for analysis of the crossflow-type atomization

SAKANO

Nambu

Mizobuchi

et al. 2022

Mechanical Engineering Journal

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The development of a numerical analysis of fuel atomization is important for engine design but has the problem that the required resolutions for the gas phase and atomized droplets are significantly different. To solve this, an Euler-Lagrange coupling numerical analysis for fuel atomization has been developed. For the improvement of this analysis by including the shape effect of atomized droplets and increasing the number of droplets that can be replaced by Lagrange particles, a new droplet shape representation method using five shape parameters -Sphericity, Bentness, Slenderness, Flatness and Complexity -are proposed. These parameters are defined based on indices that reflect the overall scale of droplets, such as volume and area, and the local distribution of shape features within a droplet. First, a test case with ideal geometries showed how well these parameters qualitatively and quantitatively represent the characteristics of droplet shapes. Then, the distribution of droplet shapes in a crossflow computed by a detailed numerical analysis using the S-CLSVOF method was analyzed by the proposed shape representation method. As a result, it was shown that the parameters expressed the characteristics of actual droplets sampled from the analysis. In addition, it was confirmed that the shape distributions expressed by the proposed five parameters differed depending on the density ratio of gas and liquid and/or the Weber number, and that the analysis result is consistent with the theories of surface tension and linear instability.

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Section: Numerical Calculation Crossflow Atomization Based On Vof Methodsmentioning

confidence: 99%

“…In the process of (1), VOF data is calculated by a solver based on the S-CLSVOF method (Albadawi et al, 2013;Nambu and Mizobuchi, 2021), and details are described in Sec. 4.1.…”

Section: Introduced Parameters Of Global Shape Parametersmentioning

confidence: 99%

Evaluation of three-dimensional droplet shape for analysis of the crossflow-type atomization

SAKANO

Nambu

Mizobuchi

et al. 2022

Mechanical Engineering Journal

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“…The conservation equation is derived from the overall average or hybrid theory method of local instantaneous equilibrium of each phase. The governing equation of Euler die is shown in literature [10].…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

CFD Simulation of the Cavitation Behaviour in Single Jet Process via Outlet Pressure

Zhang

Chai

et al. 2022

J. Phys.: Conf. Ser.

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Cavitation effect is the most common phenomenon in the process of jet. In this work, the method of CFD numerical simulation is used to study the cavitation behaviour in the process of single hole jet. In order to obtain the mixing situation and change process of gaseous water and liquid water produced in the nozzle, the Euler multiphase flow model and the realizable k-epsilon model in the turbulence model are used. The simulation results show that the degree and frequency of liquid column breakage of cavitation water jet are far higher than those of ordinary water jet. And the structure of the nozzle also has the most ideal situation. When the nozzle inlet size is 20 mm, the nozzle diameter is 1 mm, and the nozzle length is 5 mm, which is most conducive to the growth and diffusion of cavitation bubbles. The cavitation effect increases with the increase of the inlet jet velocity, but the promotion effect does not increase significantly when the inlet velocity is greater than 2.5 m/s. From the perspective of energy consumption, the optimum velocity at this time is 2.5 m/s. And the pressure environment at the nozzle outlet also affects the cavitation phenomenon, mainly as follows: positive pressure can inhibit the cavitation effect, negative pressure can promote the cavitation effect, but the negative pressure has a limited effect on the degree of cavitation.

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“…The reason for this situation lies in the fact that, under the current simulation conditions, the surface waves exist not in a one-dimensional form but a two-dimensional form, in which surface waves exist in both vertical and spanwise directions and the breakup of the liquid column is quite complex. 7 and 8 refer to the seventh and eighth vertical surface wave peaks.…”

Section: Atomization Mechanism Of Supersonic Ljicmentioning

confidence: 99%

“…An LJIC primary atomization simulation was carried out by Nambu [7] to reveal the characteristics of RT instability, which generates surface waves. A detailed numerical simulation (DNS) was used by Behzad [8] to investigate the surface breakup mechanism, and the results showed that the shear instability was dominant.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the Atomization Characteristics and Mechanisms of Liquid Jets in Supersonic Crossflow

Zhou,

Chang,

Shan

2023

Aerospace

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In the combustion chamber of scramjets, fuel jets interact with supersonic airflow in the form of a liquid jet in crossflow (LJIC). It is difficult to achieve adequate jet–crossflow mixing and the efficient combustion of fuel in an instant. Large eddy simulation (LES), the coupled level-set and volume of fluid (CLSVOF) method, and an adaptive mesh refinement (AMR) framework are used to simulate supersonic LJICs in this article. This way, LJIC atomization characteristics and mechanisms can be further explored and analyzed in detail. It is found that the surface waves of the liquid column exist in a two-dimensional form, including vertical and spanwise directions. Column breakup occurs when all the spanwise surface waves between adjacent vertical surface waves break up. Bow shock waves, composed of multiple connected arcuate shock waves, are dynamic and will change with the evolution of the liquid column. The vortex ring movement of supersonic LJICs, whose trends in the vertical and spanwise directions are different, is relatively complex, which is due to the complex and time-dependent shape of liquid columns.

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Detailed numerical simulation of primary atomization by crossflow under gas turbine engine combustor conditions

Cited by 14 publications

References 9 publications

Evaluation of three-dimensional droplet shape for analysis of the crossflow-type atomization

Evaluation of three-dimensional droplet shape for analysis of the crossflow-type atomization

CFD Simulation of the Cavitation Behaviour in Single Jet Process via Outlet Pressure

Investigations of the Atomization Characteristics and Mechanisms of Liquid Jets in Supersonic Crossflow

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