Spatio-temporal effect of the breakdown zone in the laser-initiated ignition of atomized ethyl alcohol-air mixture

Singh, Awanish Pratap; Padhi, Upasana Priyadarshani; Joarder, R. N.; Roy, Arnab

doi:10.1016/j.apenergy.2019.04.045

Cited by 12 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Of special interest is the determination of laser pulse energy for successful ignition of fuel-air mixture. It is observed that the laser pulse energy for successful ignition of fuel-air mixture is at least an order of magnitude higher [1] than the energy required in conventional electric spark. The reason for the above discrepancy could be fluid-dynamic, chemical kinetic, or the excessive heat loss of the absorbed energy through radiation during and post * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

On the radiative heat loss and axis-switching phenomena of a decaying laser spark

Joarder

Vellala

Singh

et al. 2021

Plasma Sources Sci. Technol.

Self Cite

View full text Add to dashboard Cite

A three-dimensional numerical simulation of a decaying laser spark in gaseous nitrogen has been carried out in Cartesian co-ordinate. The simulation starts with the introduction of a laser pulse in the domain. Thermal equilibrium has been assumed throughout the numerical simulation involving the species N2, N, N+, e−. The boundary conditions are treated following characteristic property of the waves to ensure smooth transmission of the blast wave out of the computational domain. The previously unexplained axis-switching phenomenon of the breakdown region has been explained, and a qualitative comparison of the same with experimental schlieren images has been made. The total radiation loss, including the loss during the breakdown, has been calculated. The variation of inverse Bremsstrahlung radiation, black body radiation, and spectral radiation of atomic nitrogen with time have been shown separately. Additionally, the temporal variation of radiation intensity of atomic nitrogen over a wavelength range has been plotted. The total radiation loss has been found to be small compared to the deposited laser energy.

show abstract

Section: Introductionmentioning

confidence: 99%

On the radiative heat loss and axis-switching phenomena of a decaying laser spark

Joarder

Vellala

Singh

et al. 2021

Plasma Sources Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Consequently, the toroidal rings are induced. These two toroidal rings then generate the third lobe [7,52]. The length of the third lobe increases rapidly in the direction opposite to the laser.…”

Section: Laser-induced Gas Breakdown and Laser Ablation In Quiescent Airmentioning

confidence: 99%

A comparative study of laser-induced gas breakdown ignition and laser ablation ignition in a supersonic combustor

An¹,

Yang

Wang³

et al. 2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Cavity ignition was achieved in a supersonic combustor by laser-induced gas breakdown (LIGB) and laser ablation (LA). High-speed photography and schlieren imaging were employed to characterize the ignition processes. schlieren imaging was also applied to visualize LIGB and LA in quiescent air. The input energy was approximately 200 mJ. The distance between the focal point of the convex lens and the target plate (d) varied from 10 mm above the target plate (d = 10 mm) to 5 mm below the target plate (d = −5 mm). The experiments performed in quiescent air indicated that the plasma of LA (d = −5 mm) was relatively small. Compared to LIGB, the expansion of the hot plume resulting from LA was less significant because the plate prevented the formation of the third lobe. The primary shock wave of LA propagated faster than that of LIGB because of high pressure ratio between the plasma and the ambient air. In the supersonic combustor with d = 5 or 10 mm, the laser induced a plasma by LIGB at the focal point and induced another plasma by LA at the cavity floor. These two tests were the combination of LIGB ignition and LA ignition. LA ignition was achieved in the test with d = −5 mm. The ignition process of the test with d = 10 mm was the slowest because of severe plasma quenching at the focal point. For the early stage of ignition, the flame kernels of the tests with d = 5 and −5 mm were different. However, the differences gradually vanished after the flame kernels reached the cavity leading edge. The ignition times of these two tests were almost the same. Therefore, the plasma resulting from LA was as effective as the plasma generated by LIGB in terms of ignition. Laser ablation ignition was a promising ignition method in a supersonic combustor.

show abstract

“…The phenomena of shock-wave propagation, evolution of the plasma kernel (hot plume), and third-lobe (forward lobe) have been described in several studies for SP-LIB [3,19,20,21]. However, the actual reason for the generation of the third lobe is not yet clearly understood, and it is still a debatable point among the researchers [22,23]. Therefore, a new approach is used in this study based on Maxwell's theory of light-matter momentum exchange to explain the previously unexplained (generation of third-lobe) and newly observed (generation of fourth-lobe and multiple shock-waves) physical phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…Laser ignition is one of the most effective alternatives to conventional spark plugs, but has not been used in practice due to its incomplete understanding. In recent times, Several studies have reported the advantages of SP-LIB for initiating ignition and combustion [3,19,20,21,22,25]. Singh et al [22] presented the associated challenges and solutions for use in practical application.…”

Section: Introductionmentioning

confidence: 99%

“…In recent times, Several studies have reported the advantages of SP-LIB for initiating ignition and combustion [3,19,20,21,22,25]. Singh et al [22] presented the associated challenges and solutions for use in practical application. They showed that the lifetime of the plasma kernel governs the occurrence of ignition instead of minimum ignition energy (MIE) or the breakdown spark.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Insight into the evolution of laser-induced plasma during successive deposition of laser energy

Singh,

Padhi,

Joarder

2021

Preprint

Self Cite

View full text Add to dashboard Cite

The interaction of high-temperature plasma with matter has several potential applications. In this study, we generated laser-induced plasma through single and successive laser energy deposition. The lifetime of the plasma is of paramount importance in most practical applications. However, this cannot be achieved with a single high-energy pulse due to some practical challenges. Therefore we carried out experimental and numerical investigations on the successive laser energy deposition and demonstrated its importance compared to the single pulse energy deposition. It has been observed that during successive energy deposition, the absorption of energy from the second pulse is nonlinear, and the reason for such behaviour is explained in this study. Due to the nonlinear absorption from the second pulse, this study therefore aims to present the pulse interval configuration between the successive pulses with which it is effective for practical use. In this study, some interesting and first direct observations of some new physical phenomena (generation of fourth-lobe and multiple shock waves) are observed during successive energy deposition when the pulse interval is 50 µs and 100 µs. This study also adopted new approch based on Maxwell's theory of momentum exchange between light and matter to explain the newly observed and some previously unexplained physical phenomena. Finally, to understand the evolution of the laser-induced plasma, the volume and volumetric expansion rate are calculated, which can be useful in determining its lifetime and mixing rate with the surrounding medium.

show abstract

Spatio-temporal effect of the breakdown zone in the laser-initiated ignition of atomized ethyl alcohol-air mixture

Cited by 12 publications

References 40 publications

On the radiative heat loss and axis-switching phenomena of a decaying laser spark

On the radiative heat loss and axis-switching phenomena of a decaying laser spark

A comparative study of laser-induced gas breakdown ignition and laser ablation ignition in a supersonic combustor

Insight into the evolution of laser-induced plasma during successive deposition of laser energy

Contact Info

Product

Resources

About