Effects of Pilot Diesel Quantity on Cycle-by-Cycle Variation of a LNG-Diesel Dual-Fuel Engine
In order to reduce the cycle-by-cycle variation of dual-fuel engine combustion and optimize the pilot diesel quantity of heavy-duty high-pressure common rail diesel engine fueled with LNG-diesel dual-fuel,with increase of pilot diesel quantity,the tendencies of cycle-by-cycle variations of peak in-cylinder pressure,peak rate of pressure rise and indicated mean effective pres-sure is investigated on a dual-fuel engine test bench at the maximum torque speed of 1600r/min and at 73kW.The results show that,with increase of the pilot diesel quantity.The cycle-by-cycle variation trends of peak cylinder pressure,peak rate of pressure rise and indicated mean effective pressure of the dual-fuel engine are the same,the mean value increases,the standard deviation decreases,the cycle distribution is centralized,and the coefficient of variation decreases.It is concluded that on the premise of no knock combustion,the combustion stability of dual-fuel engine could be improved by properly increasing the pilot diesel.
Common Rail Diesel EngineNatural GasDual-fuelPilot Diesel QuantityCycle-by-Cycle Variation
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