Erosion processes of electrodes – Experiments and modeling

D. Scherjau, G. Meyer, J. Rosc, Th Mai, A. Gschirr, A. Wimmer

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The scope of this work was to identify and examine lifetime limiting processes of spark plugs as used in stationary gas engine applications. Experimental investigations and analytic methods were applied in order to analyze and understand the wear process, especially in terms of electrode material. Physical parameters to describe rate of oxidation and diffusion processes were obtained and employed to set up a simulation model capable of lifetime prediction. Parameters not directly measurable, such as temperature load where the arc strikes the electrode, are extracted from a separate local, in-depth thermal analysis. Furthermore, ignition parameters such as level of ignition current and spark duration were systematically varied to determine their impact on the ignition system and to refine the wear model. Field tests on a Jenbacher Type 6 Gas engine have been conducted to observe the erosion of electrodes in gas engines due to the main contributing factors: combustion, spark energy input and oxidation. Using a specific spark plug test rig where combustion does not take place, the processes can be reduced to either spark energy impact or oxidation. Long-term testing as well as single spark experiments provide greater insight into the wear rate. Following this test rig step, the erosion of the electrode material caused by oxidation alone was investigated in a furnace using thermogravimetry. Before and after the tests, optical inspections (DOF), computer tomography (CT), energy dispersive x-ray spectroscopy (EDX), x-ray diffraction (XRD) and differential thermal analysis (DTA) were applied to analyze the electrode material. The understanding of wear phenomena obtained from these experiments in combination with the new simulation model developed provide the opportunity to predict lifetime and to evolve more durable spark plug designs.

LanguageEnglish
Pages85-92
Number of pages8
JournalWear
Volume428-429
DOIs
StatusPublished - 15 Jun 2019

Fingerprint

spark plugs
sparks
erosion
Erosion
Electric sparks
Spark plugs
electrode materials
Gas engines
engines
oxidation
Electrodes
electrodes
Wear of materials
Oxidation
life (durability)
ignition
thermal analysis
ignition systems
Experiments
gases

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fields of Expertise

  • Sustainable Systems

Cite this

Scherjau, D., Meyer, G., Rosc, J., Mai, T., Gschirr, A., & Wimmer, A. (2019). Erosion processes of electrodes – Experiments and modeling. Wear, 428-429, 85-92. https://doi.org/10.1016/j.wear.2019.02.031

Erosion processes of electrodes – Experiments and modeling. / Scherjau, D.; Meyer, G.; Rosc, J.; Mai, Th; Gschirr, A.; Wimmer, A.

In: Wear, Vol. 428-429, 15.06.2019, p. 85-92.

Research output: Contribution to journalArticleResearchpeer-review

Scherjau, D, Meyer, G, Rosc, J, Mai, T, Gschirr, A & Wimmer, A 2019, 'Erosion processes of electrodes – Experiments and modeling', Wear, vol. 428-429, pp. 85-92. https://doi.org/10.1016/j.wear.2019.02.031
Scherjau D, Meyer G, Rosc J, Mai T, Gschirr A, Wimmer A. Erosion processes of electrodes – Experiments and modeling. Wear. 2019 Jun 15;428-429:85-92. https://doi.org/10.1016/j.wear.2019.02.031
Scherjau, D. ; Meyer, G. ; Rosc, J. ; Mai, Th ; Gschirr, A. ; Wimmer, A. / Erosion processes of electrodes – Experiments and modeling. In: Wear. 2019 ; Vol. 428-429. pp. 85-92.
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