Calorimetry of Ignition Sparks

Teets, Richard E.; Sell, Jeffrey A.

doi:10.4271/880204

Cited by 40 publications

(22 citation statements)

References 12 publications

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“…The ignition energy provided in this study was greater than would be delivered by a standard automotive system at atmospheric pressure [2], and such systems are commonly used for determining the explosive limits of gases and vapors [3]. Thus, it was concluded that the ignition system used in the present study was more than adequate to ignite any fuel-air mixtures that were actually flammable (i.e., capable of flame propagation after ignition).…”

Section: Delivered Ignition Energymentioning

confidence: 74%

“…Resistive losses in the coil windings, ignition cable, and spark plug resistor are proportional to the square of the spark current (I 2 R losses), thus sparks in which the current is maintained at a relatively high level throughout the discharge period are inherently inefficient. Furthermore, spark discharges at atmospheric pressure deliver much less energy across the spark plug gap than do discharges at elevated pressures (such as in a running engine [2]) because the effective resistance of the gas between the electrodes is low compared with the external resistance of the ignition circuit.…”

Section: Delivered Ignition Energymentioning

confidence: 99%

“…At that point, the mixture becomes flammable and remains so until continued cooling takes it to the lean limit of flammability at some lower temperature that was not measured in this study. 2 Ethanol is flammable at room temperature, so this was the temperature at which it ceased to be flammable, i.e., the lean limit. The rich limit lies above room temperature and was not measured in this study.…”

Section: Initial Predictions Without Tuning the Modelmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and Modeling Study of the Flammability of Fuel Tank Headspace Vapors from High Ethanol Content Fuels

Gardiner¹,

Bardon²,

Pucher³

2008

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Section: Delivered Ignition Energymentioning

confidence: 74%

Section: Delivered Ignition Energymentioning

confidence: 99%

Section: Initial Predictions Without Tuning the Modelmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and Modeling Study of the Flammability of Fuel Tank Headspace Vapors from High Ethanol Content Fuels

Gardiner¹,

Bardon²,

Pucher³

2008

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“…Unfortunately, uncertainties relative to the energy deposition typically amount to 30% or more [22,41]. The amount of energy supplied to the flow is expected to determine flame propagation in the very first instants.…”

Section: Validation Case In Laminar Premixed Conditionsmentioning

confidence: 99%

Large-Eddy Simulation of Kerosene Spray Ignition in a Simplified Aeronautic Combustor

Hervo

Senoner

Biancherin

et al. 2018

Flow Turbulence Combust

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“…This information is usually obtained from published experimental data [14] and [15] measured by calorimetric techniques [16,17,18]. A drawback of these techniques is that it is not possible to study with them the spark efficiency in a flowing gas.…”

Section: Introductionmentioning

confidence: 99%

Spark Heat Transfer Measurements in Flowing Gases

Verhoeven

1997

Rev. Inst. Fr. Pét.

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RƒSUMƒ DES TRANSFERTS DE CHALEUR ENTRE UNE ƒTINCELLE DÕALLUMAGE ET DES ƒCOULEMENTS GAZEUXË partir de techniques basŽes sur lÕinterfŽromŽtrie holographique, lÕŽnergie totale transfŽrŽe par une Žtincelle aux gaz environnants a ŽtŽ mesurŽe en faisant varier la gŽomŽtrie des Žlectrodes de la bougie dÕallumage, la vitesse des gaz, la pression et le temps de charge de la bobine, cette derni•re Žtant un mod•le standard pour automobile. Pour les diffŽrentes combinaisons et valeurs des param•tres ŽtudiŽs, il a ŽtŽ observŽ une variation du "rendement dÕŽtincelle" (rapport entre lÕŽnergie transmise aux gaz par lÕŽtincelle ˆ lÕŽnergie Žlectrique fournie ˆ la bougie) allant de 20 ˆ 60 %. Pour des conditions rŽelles de fonctionnement dans un moteur, on peut estimer que lÕŽnergie transmise aux gaz par le syst•me dÕallumage est voisine de 30 mJ. Il est aussi montrŽ comment ces mesures de lÕŽnergie totale transfŽrŽe aux gaz, peuvent •tre exploitŽes pour caractŽriser en fonction du temps, la puissance transmise dans lÕŽtincelle gŽnŽrŽe par un syst•me standard dÕallumage inductif. SPARK HEAT TRANSFER MEASUREMENTS IN FLOWING GASESUsing a technique based on holographic interferometry, the total energy transferred from a spark to the surrounding gases was measured for a number of spark plug electrode geometries, flow velocities, gas pressures and coil charge times. A standard automotive ignition coil was used. For the combinations of parameter values studied, we observed "spark efficiencies" (ratio of the energy in the gas heated by the spark to the electrical energy supplied to the spark plug) of from 20 to 60 percent. For realistic engine conditions we estimate the quantity of energy transferred to the gas by our ignition system to be roughly 30 mJ. We show how these measurements of total energy transferred to the gas can be used to estimate the spark power vs. time characteristic of a standard inductive ignition system. MEDICIîN DE LAS TRANSFERENCIAS DE CALOR ENTRE UNA CHISPA DE ENCENDIDO Y LOS FLUJOS GASEOSOSTomando como punto de partida las tŽcnicas fundadas en la interferometr'a hologr ‡fica, se ha procedido a la medici-n de la energ'a total transferida por una chispa a los gases circundantes, haciendo variar la geometr'a de los electrodos de la buj'a de encendido, la velocidad de los gases, la presi-n y el tiempo de carga de la bobina, correspondiendo est ‡ oeltima a un modelo est ‡ndar para autom-vil. Se ha observado, para las distintas combinaciones y valores de los par ‡metros estudiados, una variaci-n del "rendimiento de la chispa" (relaci-n entre la energ'a transmitida a los gases por la chispa a la energ'a elŽctrica suministrada a la buj'a) que oscila entre un 20 y un 60 %. Operando en condiciones reales de funcionamiento de un motor, se puede considerar que la energ'a transmitida a los gases por el sistema de encendido, se aproxima de los 30 mJ. TambiŽn se indica c-mo estas mediciones de la energ'a total transferida a los gases pueden ser aprovechadas para caracterizar, en funci-n del tiempo, la potencia transmitida en ...

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Calorimetry of Ignition Sparks

Cited by 40 publications

References 12 publications

Experimental and Modeling Study of the Flammability of Fuel Tank Headspace Vapors from High Ethanol Content Fuels

Experimental and Modeling Study of the Flammability of Fuel Tank Headspace Vapors from High Ethanol Content Fuels

Large-Eddy Simulation of Kerosene Spray Ignition in a Simplified Aeronautic Combustor

Spark Heat Transfer Measurements in Flowing Gases

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