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Impact of Spray Cone Angle on the Performances of Methane/Diesel RCCI Engine Combustion under Low Load Operating Conditions

Hamdi, Fathi ; Agrebi, Senda ; Idrissi, Mohamed Salah ; Mondo, Kambale ; Labiadh, Zeineb ; Sadiki, Amsini ; Chrigui, Mouldi (2022):
Impact of Spray Cone Angle on the Performances of Methane/Diesel RCCI Engine Combustion under Low Load Operating Conditions. (Publisher's Version)
In: Entropy, 24 (5), MDPI, e-ISSN 1099-4300,
DOI: 10.26083/tuprints-00021377,
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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Impact of Spray Cone Angle on the Performances of Methane/Diesel RCCI Engine Combustion under Low Load Operating Conditions
Language: English
Abstract:

The behaviors of spray, in Reactivity Controlled Combustion Ignition (RCCI) dual fuel engine and subsequent emissions formation, are numerically addressed. Five spray cone angles ranging between 5° and 25° with an advanced injection timing of 22° Before Top Dead Center (BTDC) are considered. The objective of this paper is twofold: (a) to enhance engine behaviors in terms of performances and consequent emissions by adjusting spray cone angle and (b) to outcome the exergy efficiency for each case. The simulations are conducted using the Ansys-forte tool. The turbulence model is the Renormalization Group (RNG) K-epsilon, which is selected for its effectiveness in strongly sheared flows. The spray breakup is governed by the hybrid model Kelvin–Helmholtz and Rayleigh–Taylor spray models. A surrogate of n-heptane, which contains 425 species and 3128 reactions, is used for diesel combustion modeling. The obtained results for methane/diesel engine combustion, under low load operating conditions, include the distribution of heat transfer flux, pressure, temperature, Heat Release Rate (HRR), and Sauter Mean Diameter (SMD). An exergy balance analysis is conducted to quantify the engine performances. Output emissions at the outlet of the combustion chamber are also monitored in this work. Investigations show a pressure decrease for a cone angle θ = 5° of roughly 8%, compared to experimental measurement (θ = 10°). A broader cone angle produces a higher mass of NOₓ. The optimum spray cone angle, in terms of exergy efficiency, performance, and consequent emissions is found to lie at 15° ≤ θ ≤ 20°.

Journal or Publication Title: Entropy
Volume of the journal: 24
Issue Number: 5
Place of Publication: Darmstadt
Publisher: MDPI
Collation: 18 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Institute of Reactive Flows and Diagnostics (RSM)
Date Deposited: 17 May 2022 12:38
Last Modified: 18 Aug 2022 12:34
DOI: 10.26083/tuprints-00021377
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-213776
Additional Information:

This article belongs to the Special Issue Entropy Generation Analysis in Near-Wall Turbulent Flow (s. verwantes Werk).

Keywords: methane/diesel RCCI; spray angle; RNG; KH-RT spray; exergy

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21377
PPN: 494769416
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