.4100 The Qb-2 Diesel Engine Fueled With Biodiesel Cylinder Working Process Simulation And Experimental Research

It needs thorough theory and experimental study when biodiesel is widely applied and realized highly effective and pure burning in the engine, because there are differences between the biodiesel and diesel in the physics and chemistry characteristic, as well as the atomization characteristic and the combustion characteristic. Therefore, biodiesel engine burning model was established, computer simulation technology and the value computational method were applied to carries on the match analysis and the performance research which is a powerful analysis method for optimizing the engine parameters and enhancing the engine overall performance.In this paper, the fire code was used for the simulation of the progress in the cylinder of 4100QB-2 diesel engine burning with diesel or biodiesel. According to the geometric figure, model was established and mesh was completed. Then the initial conditions and boundary conditions were set up in CAD code. The engine performance and power, as well as emission were studied under different conditions. First,five different loads at 3200rpm burning biodiesel;then, different diesel/biodiesel ratios, when running at the same load; Third, different rotate speed,such as 2200rpm and 3200rpm running at full load condition; in addition, parameters'matching with the engine was carried by changing the injection timing, the initial swirl and the diameter and number of the injector.Experiment was conducted on 4100QB-2 diesel engine, running at 3200rpm with different loads when fueled with biodiesel.The result indicate that, at the max load condition(2200rpm),the peak pressure, the max heat release rate NO and soot emission are higher than that at 3200rpm.As the injection timing retard, the peak temperature and pressure decrease. For every 2℃A retard of the injection timing, the NO emission decrease 13.85%, the soot emission increase14.8% on average. The initial swirl has little influence on the engine performance. As the initial swirl increase, the maximum temperature and pressure and heat release rate increase a little. For the initial swirl increase from 1.3 to 1.8, NO emission increase by 8.0%, soot emission decrease by 7.2%.The engine power, torque., maximum temperature, pressure increase a little, and the NO and soot emission increase as well. With the same BSFC, the engine torque and power decrease as the biodiesel ratio increase. When the engine running at the same load, when fueled with biodiesel,the heat release advanced,with the NO emission increased by 33.1%, Soot emission decreased by 28.7%。The experimental confirm that the computation result and the experimental result are basically analog. The mean error of BSFC is 15.7%.