Exhaust Gas Pulsation of Constant Pressure Turbocharged Marine Diesel Engines

Azuma, Tadanori; Yura, Tadayoshi; Tokunaga, Yoshiro

doi:10.5988/jime1966.16.1001

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Co Formation Mechanism1

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2010

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“…Method of characteristics is used for solving the unsteady flow in intake and exhaust system ducts [8,19], by replacing the hyperbolic partial differential equations to total differential equations along certain characteristic lines.…”

Section: Co Formation Mechanismmentioning

confidence: 99%

Influence of Auxiliary Exhaust Valve With Variable Timing on Spark Ignition Engine Performance

Ahmed

Ibrahim

Wassef

et al. 2010

JES. Journal of Engineering Sciences

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New Variable valve timing strategy based on using auxiliary valve having variable timing (VVT) is used in this study. The valve is driven by a new variable valve timing mechanism constructed for this purpose. The auxiliary valve acts as an exhaust valve and the experiments and simulation model are carried out at different loads. The results show that engine performance is improved at full load and worsens at part loads. The study proves that using an auxiliary exhaust valve having variable timing is not recommended in engines applications. NOMENCLATURE A c p , c v D _ Mass fraction, position coordinate Greek Symbols Crank position angle (degree) Combustion duration (degree) Boltzman constant Density (kg/m 3) Equivalence ratio Supscripts Burn Unburn wall Superscripts Derivative with time (d/dt) Molar quantity

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Section: Co Formation Mechanismmentioning

confidence: 99%