Reactivity Controlled Compression Ignition Engine Fueled With Mineral Diesel and Butanol at Varying Premixed Ratios and Loads
01 Feb 2022-Journal of Energy Resources Technology-transactions of The Asme (American Society of Mechanical Engineers Digital Collection)-Vol. 144, Iss: 2
TL;DR: In this paper, the authors investigated the RCCI combustion strategy using mineral diesel/butanol fuel-pair at various premixed ratios on an energy basis (rp = 0.25, 0.50, and 0.75) at varying engine loads (BMEP = 1, 2, 3, and 4 bars).
Abstract:
Researchers have investigated reactivity-controlled compression ignition (RCCI) combustion in the past several years because of its excellent combustion, performance, and emission features. In this experimental study, the RCCI combustion strategy was investigated using mineral diesel/butanol fuel-pair at various premixed ratios (rp) on an energy basis (rp = 0.25, 0.50, and 0.75) at varying engine loads (BMEP = 1, 2, 3, and 4 bars) vis-à-vis baseline compression ignition (CI) combustion (rp = 0.0) strategy. Experiments were performed at constant engine speed (1500 rpm) in a single-cylinder research engine equipped with state-of-the-art features. The outcome of the investigation showed that port injection of Butanol as low reactivity fuel (LRF) improved the combustion and yielded superior engine performance than baseline CI combustion strategy. Engine exhaust emissions exhibited significantly lower nitrogen (NOx) oxides with butanol RCCI combustion strategy than baseline CI combustion strategy. Increasing rp of butanol showed improved combustion and emission characteristics; however, performance characteristics were not affected significantly. Particulate characteristics of the RCCI combustion strategy also showed a significant reduction in particle number concentration than baseline CI combustion. Slightly different combustion, performance, and emission characteristics of mineral diesel/ butanol-fueled RCCI combustion strategy compared to other test fuels such as mineral diesel/methanol, and mineral diesel/ethanol-fueled RCCI combustion strategy was an interesting observation of this study. Overall, this study indicated that butanol could be used as LRF in RCCI combustion engines to achieve superior combustion and emission characteristics.
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TL;DR: In this paper , the effect of exhaust gas recirculation on RCCI engine operation is reviewed and different techniques to employ EGR are discussed, and the benefits and drawbacks of EGR on RCI engine management are discussed.
Abstract: • Benefits and drawbacks of EGR on RCCI engine management are discussed. • EGR has a great impact on the RCCI engine's emission and performance characteristics. • The higher EGR percentage has more benefits on lowering soot and NOx emissions. • The collaborated regulation is important between EGR, premixed ratio, and DI timing. Exhaust gas recirculation (EGR) has been one of the essential aspects to manage combustion phasing, in-cylinder reactivity, performance, and emissions in innovative RCCI engine operation. In this review, the effect of EGR on RCCI engine operations is reviewed and different techniques to employ EGR are discussed. Generally, RCCI engine operation needs EGR support, especially at high engine loads to limit the pressure increase rate, and around 50 percent of EGR may be essential based on fuel used and engine load. The RCCI combustion engine needs a substantially low EGR rate since the rate of burning is regulated by altering the mixture reactivity by employing two fuels having significantly varied reactivity. RCCI operation with cooled EGR yielded lower pressure rise rate, cyclic variation, and NOx emissions but greater THC emissions than hot EGR operation. Internal EGR and lower pressure of intake air achieved generally greater net indicated efficiencies and reduced emissions than that of the conventional RCCI combustion at low loads. At high load, the internal EGR mode is required to be turned off to minimize fuel efficiency loss. The higher EGR percentage has more benefits on extending maximum load and lowering soot and NOx emissions, whereas the combustion and indicated thermal combustion efficiencies decline to utilize higher EGR percentage. Thus, to accomplish the greater performance and efficient process of combustion, the collaborated regulation is important between EGR rate, premixed ratio, and direct-injection timing.
22 citations
12 Apr 2010
TL;DR: A summary of diesel emissions regulations, engine developments, and nitrogen oxide (NOx), particulate matter (PM), and hydrocarbon (HC) remedia... is provided in this article.
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TL;DR: In this paper, the authors compared different low-temperature combustion (LTC) strategies with conventional compression ignition (CI) combustion for finding out a sustainable and cleaner transport solution, and showed that the RCCI combustion strategy emitted a relatively lower concentration of particles than the other two strategies (PCCI and CI).
13 citations
TL;DR: In this article , a review of recent advancements in RCCI combustion mode, its potential for using alternative fuels, the effects of different parameters on RCCi combustion mode and its optimization, and the ability of RCCIs combustion mode to extend the engine operating limit to reach higher loads, is presented.
9 citations
TL;DR: In this article , the effects of dual fuel combustion (DFC) of isobutanol on performance, emission, and energy-exergy characteristics of an off-road diesel engine using diesel and waste cooking oil biodiesel were investigated.
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