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Experimental investigation of the vi...

Yoder, Gregory S.

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Experimental investigation of the vibrational and thermal response of a laser spark plug.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Experimental investigation of the vibrational and thermal response of a laser spark plug./
Author:	Yoder, Gregory S.
Description:	199 p.
Notes:	Source: Masters Abstracts International, Volume: 52-03.
Contained By:	Masters Abstracts International52-03(E).
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1524627
ISBN:	9781303558221

Experimental investigation of the vibrational and thermal response of a laser spark plug.
Yoder, Gregory S.

Experimental investigation of the vibrational and thermal response of a laser spark plug. - 199 p.

Source: Masters Abstracts International, Volume: 52-03.

Thesis (M.S.)--West Virginia University, 2013.

A study was conducted in order to evaluate the external thermal and vibrational effects on the operation of a laser ignition system for internal combustion (IC) engine applications. West Virginia University (WVU) in conjunction with the National Energy Technology Laboratory (NETL) have constructed a prototype laser spark plug which has been designed to mount directly onto the head of a natural gas engine for the purpose of igniting an air/fuel (A/F) mixture in the engine's combustion chamber. To be considered as a viable replacement for the conventional electrode-based ignition system, integrity, durability and reliability must be justified. Thermal and oscillatory perturbations induced upon the ignition system are major influences that affect laser spark plug (LSP) operation and, therefore, quantifying these effects is necessary to further the advancement and development of this technology.

ISBN: 9781303558221Subjects--Topical Terms:

783786
Engineering, Mechanical.

Experimental investigation of the vibrational and thermal response of a laser spark plug.
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020 $a 9781303558221
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100 1 $a Yoder, Gregory S. $3 2049731
245 1 0 $a Experimental investigation of the vibrational and thermal response of a laser spark plug.
300 $a 199 p.
500 $a Source: Masters Abstracts International, Volume: 52-03.
500 $a Adviser: Mridul Gautam.
502 $a Thesis (M.S.)--West Virginia University, 2013.
520 $a A study was conducted in order to evaluate the external thermal and vibrational effects on the operation of a laser ignition system for internal combustion (IC) engine applications. West Virginia University (WVU) in conjunction with the National Energy Technology Laboratory (NETL) have constructed a prototype laser spark plug which has been designed to mount directly onto the head of a natural gas engine for the purpose of igniting an air/fuel (A/F) mixture in the engine's combustion chamber. To be considered as a viable replacement for the conventional electrode-based ignition system, integrity, durability and reliability must be justified. Thermal and oscillatory perturbations induced upon the ignition system are major influences that affect laser spark plug (LSP) operation and, therefore, quantifying these effects is necessary to further the advancement and development of this technology.
520 $a The passively q-switched Nd:YAG laser was mounted on Bruel & Kjaer (B&K) Vibration Exciter Type 4808 Shaker in conjunction with at B&K Power Amplifier Type 2719, which was oscillated in 10 Hz intervals from 0 to 60 Hz using a sine wave to mimic natural gas engine operation. The input signal simulated the rotational velocity of the engine operating from 0 to 3600 RPM with the laser mounted in three different axial orientations. The laser assembly was wrapped with medium-temperature heat tape, outfitted with thermocouples and heated from room temperature to 140 ºF to simulate the temperatures that the LSP may experience when installed on an engine. The acceleration of the payload was varied between 50% and 100% of the oscillator's maximum allowable acceleration in each mounting orientation resulting in a total of 294 total setpoints.
520 $a For each setpoint, pulse width, pulse width variation, q-switch delay, jitter and output energy were measured and recorded. Each of these dependent variables plays a critical role in multi photon ionization and precise control is necessary to limit the variability of these key parameters. Under the influence of thermal and oscillatory perturbations, the q-switch delay of the laser was found to vary significantly. For application on an IC engine, such variation in qswitch delay would result in an ignition timing variation by as much as +/-4.6 crank angle (CA) degrees in the most extreme setpoint on a cycle-to-cycle basis. Every setpoint tested was calculated to be capable of generating a plasma spark in air (>100 GW/cm2), however the resulting focal intensity was found to vary by as much as +/-13 GW/cm2.
590 $a School code: 0256.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Fluid and Plasma. $3 1018402
650 4 $a Physics, Optics. $3 1018756
690 $a 0548
690 $a 0759
690 $a 0752
710 2 $a West Virginia University. $3 1017532
773 0 $t Masters Abstracts International $g 52-03(E).
790 $a 0256
791 $a M.S.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1524627