Phenomenological Modeling of Combustion Process in Diesel Engines Based on Stochastic Method

Liu, Long

doi:10.5772/64749

Cited by 1 publication

(1 citation statement)

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“…Diesel combustion is, in principle, an unsteady turbulent diffusion combustion process [32], and therefore there are cycle variations of the luminosity field and, subsequently, of dynamic in-cylinder pressure and rate of heat release [33]. The turbulent mixing and chemical kinetics of the turbulent combustion process in diesel engines can be coupled with a probability density function [34], which is independent on the measurement system variations. Moreover, in the case of high load, it is also difficult to keep repeatability conditions and to perform a dozen complete test processes in a short time.…”

Section: Resultsmentioning

confidence: 99%

Repeatability of High-Pressure Measurement in a Diesel Engine Test Bed

Skrzek

Rucki

Górski

et al. 2020

Sensors

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This paper addresses the issue of metrological accuracy of instantaneous in-cylinder pressure measurement in a diesel engine test bed. In studies, the central unit has been the single-cylinder AVL 5402 engine. The pressure measurement was performed with a sensor designed for thermodynamic analysis, and the results were related to the crank angle, where two rotations corresponding to the four-stroke working cycle were denoted as angles between −360° and +360°. The novelty of this paper is the proposition of how to perform a type A uncertainty estimation of the in-cylinder pressure measurement and to assess its repeatability. It was demonstrated that repeatability of the measurement during the ignition process was difficult to estimate because of the phenomena that cannot ensure the repeatability conditions. To solve the problem, two methods were proposed. In one method, the pressure was measured in the subsequent cycles immediately after the ignition was turned off, and in another method, the engine was driven by a starter. The latter method provided maximal pressure values much lower than during usual tests. The obtained repeatability of measured pressure was %EV = 0.4%, which proved high capability of the evaluated measurement system.

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Section: Resultsmentioning

confidence: 99%