The response mechanism of pressure fluctuation to the unsteady heat release in a strong rotating environment

Ren, Shoujun; Tian, Bo; Jones, W.P.; Wang, Xiaohan

doi:10.1016/j.ast.2023.108356

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…8,10 Equation ( 10) has been proposed in our previous work. 47 Thus, increased fluctuation of the momentum flux, Dqu 2 , usually results in a large amplitude of pressure fluctuation, Dp 1 ,…”

Section: Momentum Flux and Combustion Instabilitymentioning

confidence: 99%

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Assessing the effects of pressure variations on combustion dynamics in vortex-tube flows

Ren,

Tian,

Jones

2024

Physics of Fluids

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In our investigation, we scrutinize combustion stability in vortex-tube combustion at high operating pressures by examining stability limits, flame configurations, and pressure oscillations. Our examination deeply probes the intricacies of flow and flame behaviors in terms of aerodynamic, thermodynamic, and flamedynamic aspects to identify the fundamental reasons behind stability variances at different pressure levels. The findings indicate that combustion instability escalates with rising operating pressures, marked by increased variability in flame patterns and a monotonic upsurge in pressure oscillation amplitudes. Although aerodynamic and thermodynamic stabilities remain unaffected, the thermoacoustic stability is compromised at elevated pressures. This is evidenced by the strong link between the Rayleigh criterion and the amplitude of pressure fluctuations, with an increased “gain” in the flame transfer function as pressure mounts. The core of the observed thermoacoustic instability is traced back to heightened density variations and mean flow velocities at high pressures, leading to amplified momentum flux oscillations.

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Section: Momentum Flux and Combustion Instabilitymentioning

confidence: 99%

“…( 11) and ( 12). 47 Based on Eqs. ( 10) and ( 11), the resultant pressure and its fluctuation (Dp 1 þ Dp 2 ) in the vortex-tube reactive flow can be calculated…”

Section: Momentum Flux and Combustion Instabilitymentioning

confidence: 99%

Assessing the effects of pressure variations on combustion dynamics in vortex-tube flows

Ren,

Tian,

Jones

2024

Physics of Fluids

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“…40,41 As the published papers suggest, the Fr and R i * relate closely to aerodynamic and thermodynamic stability, 17,42 respectively, and the Ra(x) 38,39 and FTF 40,41 are closely related to the flame-dynamic stability or thermo-acoustic stability. 43 As for the aerodynamic and thermodynamic stability in the SVRF, the volume average Fr and R i Ã numbers of different u g are shown in Fig. 7.…”

Section: A Quantitative Analysis Of Atf-dynamic Stabilitymentioning

confidence: 99%

An advanced vortex-tube technology for pure ammonia combustion with clean and steady peculiarity

Ren,

Li,

Jones

et al. 2023

Physics of Fluids

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The present study investigates the combustion performance of pure ammonia in a stratified vortex-tube reactive flow (SVRF) concerning stability limits, flame topology, pressure fluctuations, and emissions. The results demonstrate that the SVRF enables efficient and stable combustion of ammonia, characterized by uniform flame topology, low NO emissions, and high combustion efficiency. The lean φg stability limits consistently remain below 0.32 within the qf range of 5.0–30.0 l/min. Moreover, the flame topology remains consistently smooth and uniform throughout the process while maintaining a peak heat release above 5.0 × 107 W/m3. Additionally, pressure fluctuation amplitude generally stays within 100 Pa, indicating a remarkably steady combustion process for ammonia burning in the SVRF. The investigation focuses on the multi-field cooperative coupling, which enhances species and enthalpy transport to increase combustion strength, thereby contributing to a larger stability limit. Various criterion numbers are calculated to quantify the aero-/thermo/flame- dynamic stability. It is found that excellent flame-dynamic/thermo-acoustic stability plays a crucial role in achieving steady combustion of pure ammonia, which can be measured by Ra(x) and the “Gain” of the flame transfer function. The degree of synergy between flame disturbance and fluid disturbance, as well as the response of flame disturbance to fluid disturbance in SVRF, is identified as the primary factor influencing different levels of combustion stability performance. Furthermore, a relationship between aero-/thermo-dynamic stability and flame stability has also been discovered. Favorable aero-/thermo-dynamic stability promotes excellent flame-dynamic behavior by suppressing normal direction fluid fluctuation and resulting in more stable intensity and spatial location fluctuations of the flame. Additionally, momentum flux decreases within the interior region, enhancing good flame-dynamic stability when using pure ammonia as fuel.

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Effect of inlet conditions on air flow in convergent channel with a heated wall

Sakhnov,

Bryzgalov,

Naumkin

2025

International Journal of Thermal Sciences

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The response mechanism of pressure fluctuation to the unsteady heat release in a strong rotating environment

Cited by 3 publications

References 28 publications

Assessing the effects of pressure variations on combustion dynamics in vortex-tube flows

Assessing the effects of pressure variations on combustion dynamics in vortex-tube flows

An advanced vortex-tube technology for pure ammonia combustion with clean and steady peculiarity

Effect of inlet conditions on air flow in convergent channel with a heated wall

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