High Chemical Activity of Incomplete Combustion Products and a Method of Prechamber Torch Ignition for Avalanche Activation of Combustion in Internal Combustion Engines

Gussak, L. A.; Turkish, Michael C.; Siegla, Donald C.

doi:10.4271/750890

Cited by 122 publications

(37 citation statements)

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“…The chemical activity and active radical concentration levels of combustion products remains high for many milliseconds, long enough for even relatively slow internal-combustion (IC) engines to exploit for enhanced ignition. 18 · 19…”

Section: Discussionmentioning

confidence: 99%

Longitudinally Stratified Combustion in Wave Rotors

Nalim

2000

Journal of Propulsion and Power

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A wave rotor may be used as a pressure-gain combustor, effecting wave compression and expansion, and intermittent confined combustion, to enhance gas-turbine engine performance. It will be more compact than an equivalent pressure-exchange wave-rotor system, but will have similar thermodynamic and mechanical characteristics. Because the allowable turbine blade temperature limits overall fuel-air ratio to subftammable values, premixed stratification techniques are necessary to burn hydrocarbon fuels in small engines with compressor discharge temperatures well below autoignition conditions. One-dimensional, nonsteady numerical simulations of stratified-charge combustion are performed using an eddy-diffusivity turbulence model and a simple reaction model incorporating a flammability limit temperature. For good combustion efficiency, a stratification strategy is developed that concentrates fuel at the leading and trailing edges of the inlet port. Rotor and exhaust temperature profiles and performance predictions are presented at three representative operating conditions of the engine: full design load, 40% load, and idle. The results indicate that peak local gas temperatures will cause excessive temperatures in the rotor housing unless additional cooling methods are used. The rotor temperature will be acceptable, but the pattern factor presented to the turbine may be of concern, depending on exhaust duct design and duct-rotor interaction.

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Section: Discussionmentioning

confidence: 99%

Longitudinally Stratified Combustion in Wave Rotors

Nalim

2000

Journal of Propulsion and Power

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“…This concept was further developed by Gussak. By employing this concept, the first jet ignition engine under the name of LAG was designed by Gussak [18,19]. The LAG system is equipped with a cam-actuated injector.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Jet Controlled Compression Ignition on Combustion Phasing Control in Diesel Premixed Compression Ignition Systems

et al. 2014

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Abstract:In order to directly control the premixed combustion phasing, a Jet Controlled Compression Ignition (JCCI) for diesel premixed compression ignition systems is investigated. Experiments were conducted on a single cylinder natural aspirated diesel engine without EGR at 3000 rpm. Numerical models were validated by load sweep experiments at fixed spark timing. Detailed combustion characteristics were analyzed based on the BMEP of 2.18 bar. The simulation results showed that the high temperature jets of reacting active radical species issued from the ignition chamber played an important role on the onset of combustion in the JCCI system. The combustion of diesel pre-mixtures was initiated rapidly by the combustion products issued from the ignition chamber. Moreover, the flame propagation was not obvious, similar to that in Pre-mixed Charge Compression Ignition (PCCI). Consequently, spark timing sweep experiments were conducted. The results showed a good linear relationship between spark timing in the ignition chamber and CA10 and CA50, which indicated the ability for direct combustion phasing control in diesel PCCI. The NO x and soot emissions gradually changed with the decrease of spark advance angle. The maximum reduction of NO x and soot were both over 90%, and HC and CO emissions were increased.

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“…The PJC generator used In this investigation is a miniaturized version of the valve-operated pre-chamber of Gussak (5). It was developed by us following the evolution of the swirl-chamber spark plug devised by Latsch The major refinement of the unit Is associated 'Jith the redyctlon In the volume of the cavity from 1.3 em to O.S em .…”

Section: Apparatusmentioning

confidence: 99%