Matching And Research On Inlet System Of Turbocharged Diesel Engine

As the most efficient power machinery the diesel engine has now been widely used. While the installation of a turbocharger after the engine has not only increase the efficiency of fuel consumption but also decreased emissions performance, what is more important it is accord with environmental protection. With the development of computer auxiliary technology, you can create a matching model of the engine and turbocharger system, through numerical simulation method not only saves the cost and shorten the research cycle but also obtain the data results of the experimental method cannot get. And with the depth of understanding makes more perfect, more extensive application of simulation models.The main research work are as follows:(1) To build a model for topic selection dimensional simulation model by BOOST software. Through experimental design requirements, re-matching engine turbocharger. At the same time calculation and analysis, selected HP45, HP50, HP55. Finally, in order to optimize the turbocharger selected by HP50experimental comparison. Measured by the test, the engine performance has been significantly improved, which increases the maximum torque which5N·m; Maximum power to enhance the3kW; efficient fuel consumption at the maximum speed is reduced by5%; vortex front temperature decreased by10%. Eventually reach the intended purpose, the external characteristics of the lowest fuel consumption and fuel consumption were marked down to the lowest point of225g/(kW-h) and239g/(kW·h); minimum speed is increased to273Nm (1000r/min); highest the exhaust gas temperature is lowered to650℃.(2) Were explored different valve timing affect engine performance was analyzed, select the preferred values of the two groups according to the simulation engine characteristics, combined with the optimization algorithm BOOST comes integrated with a group of selected gas phase (late intake closing angle (IVC) is46°CA, exhaust early open-angle (EVO) is79°CA; intake early open-angle (IVO) is24°CA, exhaust night off angle (EVC) is23°CA), in consultation with. comparing the original model, the engine performance has improved, which reduces fuel consumption by2.1%, reducing the eddy front temperature10℃, power and torque is also slightly improved.(3) Wave effect by a gas engine intake manifold analyzes the impact on engine performance combined with the structure, At the same time optimizing, and ultimately determine a set of optimized parameters (intake manifold length140mm, diameter65mm; manifold length20mm, diameter50mm). After simulation and comparison with the original models into optimized exhaust manifold so that the original machine in high speed under power and economy is slightly improved, but to improve marginally. Which improved torque at2600r/min when a maximum of1.15%, an increase when the power is also2600r/min up to1.15%, the effective rate also reduces fuel consumption up to1.5%at2600r/min, the turbine exhaust temperature at1200r/min when reduced up to0.44%.