Simplistic Comparative Analytical Methodology for Accuracy Determination of In-Cylinder Convective Heat Transfer Coefficient Models of Diesel Engine Operating with Water Injection using Experimental Pressure Signals.

Autor: Janjua, Asad Asghar, Shah, Samiur Rahman, Din, Emad Ud, Aslam, Jawad, Khan, Muhammad Zeeshan Ali, Tauzia, Xavier
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Zdroj: Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ); Sep2023, Vol. 48 Issue 9, p12177-12190, 14p
Abstrakt: This research was conducted through the experimentation on the High-Speed Diesel (HSD) Engine to determine the accuracy of the widely used classical empirical models (Eichelberg, Woschni, and Hohenberg) for the estimation of in-cylinder Gas-to-Wall Spatially Averaged Instantaneous Convective Heat Transfer Coefficient (HTC) at part-load conditions with retrofitted Out-Cylinder Water Injection (OWI) System. Absence of the availability of any accuracy determination methodology for HTC estimation models in water injected diesel engines has led to the development of this novel analytical methodology. For this research, in-cylinder pressure was experimentally measured at varying injected water mass flow rates in air intake manifold of the engine. Obtained data was then used for the analysis of multiple thermodynamic parameters, i.e. HTC, Heat Loss to Cylinder Walls (HLCW) and Engine Aggregate Heat Release (EAHR) to study the combustion behaviour of the engine. The Efficiency of Combustion (EOC) was estimated through the proposed comparison method between the Fuel Aggregate Heat Release (FAHR) and EAHR value calculated from each model separately for different Water Injection Rates (WIR). The Degree of Accuracy (DOA) of each HTC model was determined by the EOC value. It was proposed that larger the EOC value, more accurate will be the HTC model. So, through decision-making in developed algorithm, Woschni model appeared as the most accurate model for the determination of HTC for HSD Engine retrofitted with OWI due to its obtained 84% EOC value in comparison with the normal standard of 98% EOC for diesel engines without water injection systems. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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