Effect of fuel temperature on flame characteristics of supersonic turbulent combustion

Choi, Jeong‐Yeol; Unnikrishnan, Umesh; Hwang, Won-Sub; Jeong, Se–Young; Han, Sang-Hoon; Kim, Kyu Hong; Yang, Vigor

doi:10.1016/j.fuel.2022.125310

Cited by 16 publications

(5 citation statements)

References 105 publications

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“…Two methods will be used in this research, namely the transesterification method (Suzihaque et al, 2022) for the production of WCO biodiesel and an experimental method to test the performance of diesel engines. Based on previous research on fuel temperature variations, it has been shown that increasing fuel temperature has a positive effect on engine performance because it improves fuel spraying and evaporation, resulting in better flame and engine efficiency, and lower exhaust emissions (Choi et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Diesel Engine Performance Using Biodiesel from Cooking Oil Waste (WCO)

Suardi

Setiawan

Nugraha³

et al. 2023

j.ris.technol.pencegah.

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The increasing use of fossil fuels will cause the world's oil reserves to be depleted. In this case, it is necessary to increase the use of alternative renewable fuels, one of which is biodiesel waste cooking oil (WCO). The method used is an experimental test with a mixture of used cooking oil biodiesel and fuel. Before testing, the temperature of each fuel is increased to determine the effect of temperature on the density and viscosity values. The highest density value is found in B50 fuel at 26 °C, with a density of 0.854 gr/ml, while the lowest density is found in diesel fuel at 60 °C, with a density of 0.822 gr/ml. The highest viscosity value is found in B50 fuel at 26 °C and 60 °C, which is 3.26 cSt. After that, testing was carried out on a diesel engine, which produced the highest thermal efficiency value of 21.16% on B50 fuel with a temperature of 60 °C at 1000 rpm rotation and a load of 4000 watts. The lowest thermal efficiency of 6.43% was found in B50 fuel with a temperature of 26 °C at 800 rpm and a load of 1000 watts. The lowest consumption was found in B30 with a temperature of 60 °C at 1200 rpm, which was 420.78 gr/kWh. From the results of the tests that have been carried out, it can be concluded that the lower the density and viscosity of the fuel, the better the performance of the diesel engine on average. High temperatures effectively make the engine performance value better than normal temperatures (26 °C), and the performance of diesel engines is better with WCO fuel, especially in SFC.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Diesel Engine Performance Using Biodiesel from Cooking Oil Waste (WCO)

Suardi

Setiawan

Nugraha³

et al. 2023

j.ris.technol.pencegah.

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“…The governing equations are chemical species, momentum, and energy conservation equation, fully coupling fluid motion and chemical reactions. All governing equations were treated via the finite volume method using the density-based in-house solver, known as "PNU-RPL2D" [3,4,[32][33][34][35].…”

Section: Governing Equationsmentioning

confidence: 99%

“…The spatial discretization method in numerical simulations is directly related to calculation efficiency and reliability. Choi et al [35] compared the capture capabilities of various approaches for turbulent mixing, utilizing the third-order accuracy monotonic upstreamcentered scheme for conservation laws (MUSCL) [49], the fifth-order accuracy weighted essentially non-oscillatory (WENO) [50][51][52], and the optimized multi-dimensional limiting process (oMLP) [53,54]. They found that the oMLP scheme, based on multi-dimensional extrapolation of convective properties with a multi-dimensional limiting function, exhibited enhanced performance compared to the MUSCL and WENO methods, which relied on an extrapolation of the one-dimensional convective property, even at a lower grid resolution.…”

Section: Numerical Approachesmentioning

confidence: 99%

“…The CFL number was maintained within the range of 0.5 to 1.0, and the average time interval between each iteration was approximately 1.5 × 10 −8 s. The calculation was parallelized using OpenMP and multi-core shared-memory processors. For further detailed information about the baseline framework and other aspects of the present numerical framework, please refer to our previous papers [3,4,[32][33][34][35].…”

Section: Numerical Approachesmentioning

confidence: 99%

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Reactive Flow Dynamics of Low-Frequency Instability in a Scramjet Combustor

Jeong,

Han,

Sung

et al. 2023

Aerospace

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This study numerically investigated the combustion instability and characteristics of a laboratory-scale gaseous hydrogen-fueled scramjet combustor. For this purpose, a numerical simulation with an improved detached eddy simulation and a detailed hydrogen/oxygen reaction mechanism was performed. The numerical framework used high-resolution schemes with high-order accuracy to ensure high resolution and fidelity. A total of five fuel injection pressures were considered to characterize the combustion instability as a function of the equivalence ratio. A sampling time of up to 100 ms was considered to sufficiently accumulate several cycles of low-frequency combustion instability dynamics with a period in the order of 100 Hz. Numerical results revealed the repetitive formation/dissipation dynamics of the upstream-traveling shock wave, and it acts as a key factor of combustion instability. The period and derived principal frequency of these upstream-traveling shock waves is several ms. The frequency analysis showed that the instability frequency increased in the low-frequency range as the combustion mode transitioned from the cavity shear-layer to the jet-wake type. This characteristic was derived from the transition in combustion mode at the same equivalence ratio. Therefore, it suggests that the instability frequency shifting is governed by the combustion mode rather than the equivalence ratio. These comprehensive numerical results demonstrated not only the effect of the equivalence ratio but also the important role of the combustion mode on the low-frequency combustion instability.

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“…RoeM and MUSCL-TVD schemes are used to calculate convective fluxes, and the fourth order Runge-Kutta (RK4) scheme is used for time integration. The numerical code has been developed and applied for various compressible flow problems [1,11,[27][28][29][30] and the combination of RoeM flux splitting and the third order MUSCL-TVD exhibits sharp shock capturing with robustness. The RK4 scheme shows the best time accurate solution while maintaining spatial accuracy.…”

Section: ∂ ∂Tmentioning

confidence: 99%

Experimental Proof of Concept of a Noncircular Rotating Detonation Engine (RDE) for Propulsion Applications

et al. 2022

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A noncircular engine cross-section could provide great flexibility in the integration of propulsion into the airframe. In this work, a tri-arc RDE was constructed and tested as an example of noncircular cross-sectioned RDE. The operational characteristics of detonation wave propagation and thrust performance were investigated and compared with an equivalent circular RDE under the same operating conditions. High-speed camera images, short-time Fourier transform (STFT), and fast Fourier transform (FFT) were used for the investigation. The tri-arc RDE showed very similar characteristics to the circular RDE but exhibited slightly better stability and propulsion performance than the circular RDE. We consider that repeated curvature changes positively affect the stability of detonation wave propagation. The experimental data show contradicting results from the numerical analysis with a homogeneous mixture assumption in which the detonation pressures at the convex corner were greater than those at the concave corner. It is reasoned that the tri-arc injector design provides a non-uniform mixture composition, resulting in a strong detonation at the convex corner. Overall, the noncircular RDE of a tri-arc shaped cross-section is demonstrated, one which performs slightly better than an ordinary circular-shaped RDE both in detonation stability and performance.

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Effect of fuel temperature on flame characteristics of supersonic turbulent combustion

Cited by 16 publications

References 105 publications

Evaluation of Diesel Engine Performance Using Biodiesel from Cooking Oil Waste (WCO)

Evaluation of Diesel Engine Performance Using Biodiesel from Cooking Oil Waste (WCO)

Reactive Flow Dynamics of Low-Frequency Instability in a Scramjet Combustor

Experimental Proof of Concept of a Noncircular Rotating Detonation Engine (RDE) for Propulsion Applications

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