Effect of LIVC Miller Cycle on Combustion and Gas Exchange on a Highly Intensified Single-cylinder Diesel Engine

doi:10.3969/j.issn.1000-1093.2019.01.002

Abstract

Abstract: The effect of Miller cycle with late intake valve closing (LIVC) timings on the combustion and gas exchange of a highly intensified single-cylinder diesel engine is studied through experiment and simulation. Three LIVC timings, i.e., -110°CA(original engine), -86°CA and -70°CA after top dead center, are used in the research. The engine test is conducted under the operating conditions: a speed of 3 600 r/min, an indicated power density of 77 kW and an excess air ratio of 1.6. An 1-D thermodynamic simulation model is established for the engine test setup in order to further analyze the influence of LIVC Miller cycle on the gas exchange process. The results show that, as the intake valve closure (IVC) timing retards, the in-cylinder charge pressure and temperature are reduced obviously due to the reduction in the effective compression ratio. This results in a noticeable decrease in the maximum combustion pressure and temperature, the maximum pressure rise rate and the exhaust temperature. This means that LIVC Miller cycle helps to constrain the increasing mechanical and thermal loads in the highly intensified diesel engine. In addition, as the IVC timing retards, the Miller loss and backflow rate during the compression stroke increase, while the charging coefficient and pumping loss decrease. The LIVC Miller cycle is also benefit to improve fuel consumption and reduce NO_x emissions. Key

Key words: highlyintensifieddieselengine, lateintakevalveclosing, Millercycle, intakevalveclosuretiming, combustion, gasexchange

CLC Number:

TK421⁺.1

WANG Ziyu， ZHANG Yan， WANG Lei， LIU Jinlong， BAI Honglin， LI Yufeng. Effect of LIVC Miller Cycle on Combustion and Gas Exchange on a Highly Intensified Single-cylinder Diesel Engine[J]. Acta Armamentarii, 2019, 40(1): 8-17.

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第40卷第1期
2019 年1月兵工学报ACTA
ARMAMENTARIIVol.40No.1Jan.2019

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