16V280 Calculation And Analysis Of Diesel Engine Working Process

The current design and optimization of diesel engine,most of the work is carried out by means of modeling and simulation of the model simulation,helps to quickly calculate the optimization scheme on diesel engine performance,the influence of comprehensive situation and find out the optimal solution for real machine again after verification,so that we can shorten the cycle,save money,speed up the optimization process of research.Firstly,the basic principles,mathematical models and evaluation indexes used in the simulation calculation are elaborated and explained in detail,including the basic differential equation,combustion heat release rate model,combustion model,cylinder wall heat transfer model,NOx emission model,soot emission model,engine performance evaluation indexes.Then combined with the actual model 16V280 ZJ,using GT-POWER software to establish its one-dimensional simulation model,including the intake and exhaust Settings,injector Settings,cylinder Settings,crankcase Settings,exhaust gas turbocharger Settings.At the same time,according to the load characteristics of the 1000 r/min each working condition of the experimental data and the characteristics of 3680 kw traction calculation model of the simulation of the whole machine working condition of the experimental data for checking and correction,the error of the simulation value and experimental value is less than 10%,the simulation model is an accurate reflection of the actual aircraft operating characteristics,and check and verify the exhaust turbocharger matching with the original machine effect is good.Finally,under the calibration condition,through the inlet and exhaust CAM timing,injection advance Angle,nozzle diameter,number and length,compression ratio and combustion chamber wall average temperature parameters were optimized individually or in combination,through the DOE experimental design and standard genetic algorithm to find the best combination scheme.The purpose of optimization is to increase the effective power of diesel engine and reduce the fuel consumption rate of diesel engine,and to predict the main harmful emissions,NOx and Soot.Through the final optimization results,the optimal combination scheme is obtained.The inlet CAM timing is 233.25 deg,the exhaust CAM timing is 141.25 deg,the injection advance Angle is-22 deg,the nozzle diameter is 0.45 mm,the number of nozzle is 10,the length of nozzle is 2 mm,the compression ratio is 15,and the average wall temperature remains unchanged.After optimization,the effective power of diesel engine is increased by 5.2%.Fuel consumption rate reduced by 4.65%;NOx emission is predicted to increase by 2.19%;Soot emissions increased by 13.5% to 0.3029 g/k W·h.The final optimization results will provide reference for the subsequent improvement and design of diesel engines,and provide experimental basis for the actual machine test of manufacturers.