نتایج جستجو برای: ignition system
تعداد نتایج: 2238515 فیلتر نتایج به سال:
Two-stage ignition and NTC phenomenon in diesel sprays is investigated by performing 3-D two-phase reacting flow simulations in a dual-fuel engine. Spray processes modeled include fuel atomization, droplet distortion, droplet drag, turbulent dispersion, droplet interactions in terms of collision and coalescence, vaporization, and spray–wall interaction. A validated reaction mechanism is impleme...
The fundamental processea of ignition and eonbuation are reviewed to date as part of the OCD program for aaseaaing urban vulnerability to fire from nuclear barste* Sufficient background infomatlon is provided for use in future fire-damage aaaesaments and fire-protection procedures. Included are definitlona of the types of ignition and combustion, the factors governing ignition and combustion, a...
Hydrodynamic instabilities can cause capsule defects and other perturbations to grow and degrade implosion performance in ignition experiments at the National Ignition Facility (NIF). Here, we show the first experimental demonstration that a strong unsupported first shock in indirect drive implosions at the NIF reduces ablation front instability growth leading to a 3 to 10 times higher yield wi...
The MIT Linear Electrostatic Ion Accelerator (LEIA) generates DD and D(3)He fusion products for the development of nuclear diagnostics for Omega, Z, and the National Ignition Facility (NIF). Significant improvements to the system in recent years are presented. Fusion reaction rates, as high as 10(7) s(-1) and 10(6) s(-1) for DD and D(3)He, respectively, are now well regulated with a new ion sou...
We study the effect of stellar rotation on the carbon ignition in a carbonoxygen white dwarf accreting CO-rich matter. Including the effect of the centrifugal force of rotation, we have calculated evolutionary models up to the carbon ignition for various accretion rates. The rotation velocity at the stellar surface is set to be the Keplerian velocity. The angular velocity in the stellar interio...
The control of ignition in a rocket engine is a critical problem for combustion chamber design. Delayed ignition may lead to high amplitude pressure fluctuations that can damage the burner (strong ignition) whereas early ignition may fail. This paper describes a numerical study of a strong ignition sequence observed in a laboratoryscale single-injector rocket chamber ignited by a laser and fuel...
Knowledge of the oxidation, ignition and combustion of bulk metals is important for fire safety in the production, management and utilization of liquid and gaseous oxygen for ground based and space applications. This proposal outlines studies in continuation of research initiated earlier under NASA support to investigate the ignition and combustion characteristics of bulk metals under varying g...
Legislations for greenhouse gas and pollutant emissions from light-duty vehicles are pushing the spark ignition engine to be cleaner more efficient. As one of promising solutions, enhancing energy shows great potential in simultaneously mitigating combustion knock enabling lean-burn operation. Featured with distributed sites, pre-chamber systems large or small volumes, auxiliary no fueling, ori...
Igniter is an important part of aircraft engine, which should be reliable to ensure safety. Spark frequency disorder is common fault to the aviation ignition device, and it is great hidden danger to the aircraft engine. To guarantee the safety and reliability of aviation igniter, the fault mechanism of the aviation ignition spark frequency disorder is researched in this paper. The factors which...
Ignition timing in Homogeneous Charge Compression Ignition (HCCI) engines is dominated by thermo-kinetic reactions that are dependant on the charge properties. A single zone thermodynamic model, coupled to a kinetic mechanism, is developed to predict the ignition timing of Primary Reference Fuels (PRFs) in an HCCI engine. The model, consisting of 120 chemical reactions and 58 species, is valida...
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