Luminosity and Thermal Energy Measurement and Comparison of a Dielectric Barrier Discharge in an Optical Pressure-Based Calorimeter at Engine Relevant Conditions
- 6 April 2021
- conference paper
- conference paper
- Published by SAE International in SAE International Journal of Advances and Current Practices in Mobility
Abstract
The amount of the thermal energy released in a gas mixture is crucial to characterize the igniter capability to start a robust ignition in internal combustion engines, especially in challenging operating conditions as high EGR dilution or very lean mixture. Nevertheless, the thermal energy measurement can be performed only in controlled environments, such as constant volume vessels, while it is not feasible in metal engines. This work proposes to find a correlation between the released thermal energy and the luminosity generated by the same discharge event in an optical vessel. This correlation implies that energy information could be indirectly obtained through feasible optical measurements in optical engines, and even in metal engines via low-cost diagnostic tools such as borescopes. The experimental campaign is carried out with a non-equilibrium plasma igniter, a dielectric-barrier discharge igniter (BDI). This choice is due to the inherent igniter features (i.e., the development of a volumetric discharge and the capability to modulate the discharge intensity) that makes it suitable for the purpose of the proposed campaign. Pure nitrogen, at engine-relevant pressure, is used as medium inside the vessel. The electrode voltage is varied from inception to the highest value allowed; a sweep of discharge duration is performed as well.Keywords
This publication has 49 references indexed in Scilit:
- Evaluation of different methods for combined thermodynamic and optical analysis of combustion in spark ignition enginesEnergy Conversion and Management, 2014
- Comparative experimental evaluation of performance, combustion and emissions of laser ignition with conventional spark plug in a compressed natural gas fuelled single cylinder engineFuel, 2014
- Compression ratio and blow-by rates estimation based on motored pressure trace analysis for an optical spark ignition engineApplied Thermal Engineering, 2013
- A numerical study of high-pressure non-equilibrium streamers for combustion ignition applicationJournal of Applied Physics, 2013
- Experimental analysis and modelling of positive streamer in air: towards an estimation of O and N radical productionJournal of Physics D: Applied Physics, 2008
- Plasma assisted ignition and combustionJournal of Physics D: Applied Physics, 2006
- FEM simulation of local heating and melting during electrical discharge plasma impactModelling and Simulation in Materials Science and Engineering, 2004
- Formation and structure of primary and secondary streamers in positive pulsed corona discharge—effect of oxygen concentration and applied voltageJournal of Physics D: Applied Physics, 2003
- Gaseous electrical discharge characteristics in air and nitrogen at cryogenic temperatureIEEE Transactions on Dielectrics and Electrical Insulation, 2002
- Systematic measurements of OH chemiluminescence for fuel-lean, high-pressure, premixed, laminar flamesFuel, 2001