Relationship between flame thickness and velocity based on thermodynamic three kernels in a constant volume combustion chamber

Kim, Kwonse; Im, Seokyeon; Choe, Munseok; Yoon, Tae Jun; Kang, Dogyeong; Choi, Dooseuk

doi:10.1007/s12206-019-0443-6

Cited by 13 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Liu [26] conducted ignition tests of different plasma parameters in an annular combustor used in gas turbines, the results showed that the plasma has a good ability to reduce the minimum ignition energy and expand the ignition limit, and the active substances in the plasma are beneficial to the kernel growth and flame propagation. Kim [27] studied the discharge and combustion characteristics of spark, arc and jet plasma in a constant volume combustor, and the results showed that the combustion characteristics of arc and jet plasma discharge become better than that of traditional spark discharge in a rarefied condition as the equivalent rate of air-C 3 H 8 increases.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of C-shape embedded multi-channel plasma igniter in a single-head swirl combustor

Cai¹,

Song²,

Zhang³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

A C-shape embedded multi-channel plasma igniter (CEMPI) is presented in this paper. Compared with traditional spark igniter (SI), it has a deeper penetration depth of fire kernel. The fuel supply pressure was kept at 0.2 MPa for the ignition tests. The ignition processes of two igniters at different air flow in a single-head swirl combustor were captured by using the technology of CH* chemiluminescence imaging. The influence of air flow on the ignition process and the ignition characteristics of two igniters were studied. The results show that the ignition dynamic process can be divided into four stages: fire kernel growth stage, flame stagnation stage, flame propagation stage and overall flame stage. To some extent, increasing air flow can shorten the ignition delay caused by flame stagnation, improve the flame propagation speed, and form overall flame earlier, which is conducive to fast ignition. Compared with SIs, CEMPIs can produce larger and more powerful fire kernel, which can penetrate deeper into the central recirculation zone and touch combustible mixture to generate initial flame. It also has a faster flame propagation speed to reduce the ignition time significantly. In addition, the CEMPI can widen the lean ignition boundary and has a more significant ignition advantage when the air flow is small.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental investigation of C-shape embedded multi-channel plasma igniter in a single-head swirl combustor

Cai¹,

Song²,

Zhang³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The matching effect of high voltage (MEHV) is well-known for a technical method capable of inducing the plasma discharge and expanding the kernel volume [10]. The matching effect of high voltage (MEHV) can be easily seen between the cathode and anode combined with two different circuits of the ignition system, and the discharge of MEHV is expanded between spark plug gaps by electron collision, which is transferred from the cathode to anode.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Ignition Effect in Constant Volume Combustion Chamber Based on Matching Effect of High Voltage (MEHV) Method

Kim

Han

2020

Energies

Self Cite

View full text Add to dashboard Cite

The characteristics of spark ignition with a constant volume combustion chamber (CVCC) is evaluated for the efficiency of capacitive-assisted ignition (CAI), such as spark kernel and flame growth. The conventional spark method and matching effect of high voltage (MEHV) method are evaluated to compare the spark growth distribution characteristics. To do this study, a plasma system is used and is consisted of input power, three capacitors, a transformer, high voltage cable, J-type of a spark plug, diode, and CVCC. The experiment is conducted under various operating conditions, such as 1 bar, 295 K of initial temperature, 50, 100, 150 V of ignition box, 400 V of MEHV, 0.7 ms of spark duration, and 0 kΩ of plug resistor. The results show that the spark growth at the initial voltages of 100 V and 150 V has the same characteristic, and the surface area is increased by 13 mm2 at 150 V compared to 100 V because capacitance energy stored in three capacitors is efficiently induced by the effect of dielectric breakdown and electron collision. Consequently, the spark growth of MEVH is widely distributed atmospheric more than the conventional spark, and the internal temperature of the spark kernel could be presumed to change the non-thermal plasma to thermal plasma by MEHV.

show abstract

“…Though PM can be purified using a commercialized DPF (Diesel Particle Filter), NOx should be treated by additionally installing a device that satisfies Tier 4, Euro-6 regulations. An EGR (Exhaust Gas Recirculation) + LNT (Lean NOx Trap) system and a Urea SCR (Selective Catalyst Reduction) system are mostly developed as a plan to satisfy Tier 4, Euro-6 regulation and, to increase NOx reduction efficiency, development should be carryout out by changing the design factors such as the catalyst, mixer and injector in the LNT and SCR systems [5,6].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Factors Affecting the Uniformity of Urea and Exhaust Gas Using an SCR Simulator

Choe

Kang

Choi

2020

DDF

Self Cite

View full text Add to dashboard Cite

As it is difficult to confirm mixed shape and mixing ratio which depend on the actual mixer inside the SCR, the present study on mixed shape and mixing ratio has been conducted by producing an SCR system simulator. Total 19 sensors were installed and the system was designed not to allow formation of a negative pressure inside the exhaust pipe. The experiment was conducted setting engine rpm, temperature, mixer shape, and distance as the experiment variables. As a result of the experiment, in the case of non-mixer type, a phenomenon was found where urea became locally packed as the exhaust gas and urea were not mixed and, when an R-type mixer was applied, urea was formed being spread on the whole. It was also confirmed that uniformity index was increased by 8 % in average when an R-type mixer was used in comparison to that of the non-mixer type, and the non-mixer type failed to achieve flow uniformity of 90 % or higher while the case where an R-type mixer was used could achieve it when the distance was 20 cm or bigger. Based on such a result, changes in the uniformity of urea and exhaust gas depending on existence of a mixer, exhaust gas temperature, engine rpm, and distance could be confirmed. It is thought that additional studies are required to be conducted later on the effect of a change in the mixer shape on flow uniformity.

show abstract

Relationship between flame thickness and velocity based on thermodynamic three kernels in a constant volume combustion chamber

Cited by 13 publications

References 22 publications

Experimental investigation of C-shape embedded multi-channel plasma igniter in a single-head swirl combustor

Experimental investigation of C-shape embedded multi-channel plasma igniter in a single-head swirl combustor

Evaluation of the Ignition Effect in Constant Volume Combustion Chamber Based on Matching Effect of High Voltage (MEHV) Method

A Study on the Factors Affecting the Uniformity of Urea and Exhaust Gas Using an SCR Simulator

Contact Info

Product

Resources

About