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Title: Electromagnetic enhanced ignition

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 181; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 15:03:17; Journal ID: ISSN 0010-2180
Country of Publication:
United States

Citation Formats

Duque, Amanda L. Higginbotham, and Perry, W. Lee. Electromagnetic enhanced ignition. United States: N. p., 2017. Web. doi:10.1016/j.combustflame.2017.03.013.
Duque, Amanda L. Higginbotham, & Perry, W. Lee. Electromagnetic enhanced ignition. United States. doi:10.1016/j.combustflame.2017.03.013.
Duque, Amanda L. Higginbotham, and Perry, W. Lee. 2017. "Electromagnetic enhanced ignition". United States. doi:10.1016/j.combustflame.2017.03.013.
title = {Electromagnetic enhanced ignition},
author = {Duque, Amanda L. Higginbotham and Perry, W. Lee},
abstractNote = {},
doi = {10.1016/j.combustflame.2017.03.013},
journal = {Combustion and Flame},
number = C,
volume = 181,
place = {United States},
year = 2017,
month = 7

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on March 30, 2018
Publisher's Accepted Manuscript

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  • The integrated growth rate of various relativistic beam/plasma instabilities in a weakly varying plasma density gradient is calculated using a WKB-like approximation. It is proven that such an assumption can be made in fast ignition scenario conditions. The formalism is applied to the two-stream, the filamentation, and the two-stream/filamentation instabilities, the latter instability being a mixture of the former two, and is the fastest growing one. The results are restricted to collisionless plasmas and nonrelativistic beam and plasma temperatures. Filamentation instability is reduced by the density gradient and eventually does not develop in the core, whereas two-stream and two-stream/filamentation instabilitiesmore » should saturate even before they feel the gradient. Various effects connected to the density gradient are discussed. It is found they should be negligible as long as these later instabilities remain in their respective linear regime.« less
  • The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory comprises vacuum systems that range in pressure from 10{sup {minus}4} to 10{sup {minus}11} Torr. For cost savings associated with commonality, it is desirable to use one ultrahigh vacuum (UHV)-compatible high vacuum gauge throughout the accelerator. Work was done with radioactive isotopes to enhance ignition of inverted magnetron gauges at very low pressures (i.e., {lt}10{sup {minus}10} Torr). Tests were initially conducted using cobalt-coated copper washers with a nickel flash to prevent oxidation. Solid nickel washers were also activated and tested. Problems with these sources will be discussed. Finally, an americium sourcemore » was tested. The UHV-compatible americium sources yielded average ignition times of about 10 min at 4{times}10{sup {minus}11} Torr. The addition of the americium source produced a gauge suitable for operation at UHV pressures, and as a consequence for all of the RHIC. {copyright} {ital 1996 American Vacuum Society}« less
  • Spark ignition engines typically have ignition systems that develop 20--30 kV for breakdown of the spark plug gap and deliver current pulses in the range of 30--100 mA. These systems are characterized by very low energy transfer efficiency, 1% or less. Most of the energy is dissipated by the resistances in the transformer, spark plug wires, and spark plugs. This operating mode is adequate (but not necessarily optimum) for most engines, but will not meet the needs of future lean burn and some alternative fuel engines that require higher energy discharges to effectively ignite air/fuel mixtures. Requirements for increased ignitionmore » power and energy will have to be met with higher efficiency ignition systems. Improved efficiency can be achieved by utilizing peaking capacitors in the secondary circuit, preferably with a low-loss spark coil. With these modifications, the transfer efficiency can be increased to the 50--75% range. This paper summarizes the results of recent high-power ignition experiments and related critical system analyzes for so-called breakdown ignition conditions. It includes descriptions of conventional ignition systems, a method for upgrading, and a new higher energy system that features multiple drivers and an energy recovery circuit. The effects of power-enhanced ignition on mileage and emissions for a variety of vehicles tested in laboratory and on the road are summarized sufficiently to show a range of typical results. The paper does not include comprehensive test data for a wide range of vehicles and operating conditions.« less
  • Some of the problems with using natural gas as an automotive fuel in spark-ignition engines are its high minimum ignition energy, long ignition delay, a low flame speed relative to gasoline. Engineers examined the possibility of solving some of these problems by using a more efficient ignition source to reduce ignition delay and to enhance the initial burning rate. The ignition sources considered were a multiple-electrode spark plug, plasma jet igniter, and conventional spark plug. The time to burn 10% of the mixture (including flame initiation and initial propagation) was compared for each source. The multiple-electrode spark plug reduced thismore » time by 12% over that of the conventional spark plug. Reductions were larger when additional energy was supplied to the discharge.« less
  • A scheme of using two-color laser pulses for hole boring into overdense plasma as well as energy transfer into electron and ion beams has been studied using particle-in-cell simulations. Following an ultra-short ultra-intense hole-boring laser pulse with a short central wavelength in extreme ultra-violet range, the main infrared driving laser pulse can be guided in the hollow channel preformed by the former laser and propagate much deeper into an overdense plasma, as compared to the case using the infrared laser only. In addition to efficiently transferring the main driving laser energy into energetic electrons and ions generation deep inside themore » overdense plasma, the ion beam divergence can be greatly reduced. The results might be beneficial for the fast ignition concept of inertial confinement fusion.« less