Possibilities of Wall Heat Transfer Measurements at a Supercharged Euro VI Heavy-Duty Diesel Engine with High EGR-Rates, an In-Cylinder Peak Pressure of 250 Bar and an Injection Pressure up to 2500 Bar

Hennes, Christian; Lehmann, Jürgen; Koch, Thomas

doi:10.4271/2019-24-0171

Cited by 6 publications

(1 citation statement)

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“…Thermocouple mounting in the piston is possible, but a telemetry system is required to extract data from the moving piston. Mechanical linkage systems have been used by researchers 4–6 for piston measurements, but suffer from durability problems due to the flexing of the wires as the engine rotates. Wireless telemetry systems eliminate many of the durability problems of wired systems but have the added complexity and cost of an additional data acquisition system.…”

Section: Introductionmentioning

confidence: 99%

High-output diesel engine heat transfer: Part 1 - comparison between piston heat flux and global energy balance

Gingrich

Tess

Korivi

et al. 2021

International Journal of Engine Research

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High-output diesel engine heat transfer measurements are presented in this paper, which is the first of a two-part series of papers. Local piston heat transfer, based on fast-response piston surface temperature data, is compared to global engine heat transfer based on thermodynamic data. A single-cylinder research engine was operated at multiple conditions, including very high-output cases – 30 bar IMEPg and 250 bar in-cylinder pressure. A wireless telemetry system was used to acquire fast-response piston surface temperature data, from which heat flux was calculated. An interpolation and averaging procedure was developed and a method to recover the steady-state portion of the heat flux based on the in-cylinder thermodynamic state was applied. The local measurements were spatially integrated to find total heat transfer, which was found to agree well with the global thermodynamic measurements. A delayed onset of the rise of spatially averaged heat flux was observed for later start of injection timings. The dataset is internally consistent, for example, the local measurements match the global values, which makes it well suited for heat transfer correlation development; this development is pursued in the second part of this paper.

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Section: Introductionmentioning

confidence: 99%