Non Equilibrium Kinetic Studies Of Repetitively Pulsed Nanosecond Discharge Plasma Assisted Combustion
Download Non Equilibrium Kinetic Studies Of Repetitively Pulsed Nanosecond Discharge Plasma Assisted Combustion full books in PDF, epub, and Kindle. Read online free Non Equilibrium Kinetic Studies Of Repetitively Pulsed Nanosecond Discharge Plasma Assisted Combustion ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Non-equilibrium Kinetic Studies of Repetitively Pulsed Nanosecond Discharge Plasma Assisted Combustion
Author | : Mruthunjaya Uddi |
Publisher | : |
Total Pages | : 177 |
Release | : 2008 |
Genre | : Chemical kinetics |
ISBN | : |
Download Non-equilibrium Kinetic Studies of Repetitively Pulsed Nanosecond Discharge Plasma Assisted Combustion Book in PDF, Epub and Kindle
Abstract: The dissertation presents non-equilibrium chemical kinetic studies of large volume lean gaseous hydrocarbon/ air mixture combustion at temperatures (~300K) much below self ignition temperatures and low pressures (40-80torr), in ~25 nanosecond duration repetitive high voltage (~18kV) electric discharges running at 10 Hz. Xenon calibrated Two Photon Absorption Laser Induced Fluorescence (TALIF) is used to measure absolute atomic oxygen concentrations in air, methane-air, and ethylene-air non-equilibrium plasmas, as a function of time after initiation of a single 25 nsec discharge pulse at 10Hz. Oxygen atom densities are also measured after a burst of nanosecond discharges at a variety of delay times, the burst being run at 10Hz. Each burst contains sequences of 2 to 100 nanosecond discharge pulses at 100 kHz. Burst mode measurements show very significant (up to ~0.2%) build-up of atomic oxygen density in air, and some build-up (by a factor of approximately three) in methane-air at [phi]=0.5. Burst measurements in ethylene-air at [phi]=0.5 show essentially no build-up, due to rapid O atom reactions with ethylene in the time interval between the pulses. Nitric oxide density is also measured using single photon Laser Induced Fluorescence (LIF), in a manner similar to oxygen atoms, and compared with kinetic modeling. Fluorescence from a NO (4.18ppm) +N2 calibration gas is used to calibrate the NO densities. Peak density in air is found to be ~ 3.5ppm at ~ 225us, increasing from almost initial levels of ~ 0 ppm directly after the pulse. Kinetic modeling using only the Zeldovich mechanism predicts a slow increase in NO formation, in ~ 2 ms, which points towards the active participation of excited N2 and O2 molecules and N atoms in forming NO molecules. Ignition delay at a variety of fuel/ air conditions is studied using OH emission measurements at ~ 308nm as ignition foot prints. The ignition delay is found to be in the range of 6-20ms for ethylene/ air mixtures. No ignition was observed in the case of methane/ air mixtures. All these measurements agree well with kinetic modeling developed involving plasma reactions and electron energy distribution function calculations.
Non-equilibrium Kinetic Studies of Repetitively Pulsed Nanosecond Discharge Plasma Assisted Combustion Related Books
Pages: 177
Pages: 1028
Pages:
Pages: 0
Pages: