Space velocity calculation of exhaust after-treatment device for a diesel engine
To improve the performance of diesel engine after-treatment device,the calculation method of exhaust mass flow rate is analyzed,and validated by bench tests to collect the intake mass flow rate of diesel engines under the rated conditions.Based on the intake density and intake mass flow rate,the airspeed of the after-treatment of exhaust gas device is calculated using the intake air flow rate and fuel consumption measurement method,as well as the carbon balance method,respectively,and the effectiveness of the two calculation methods is compared.The results show that the air velocity of the after-treatment of exhaust gas device calculated by the intake mass flow rate and fuel consumption measurement method,as well as the carbon balance method,are close.The relative error of air velocity calculated by the two methods is 3.94%,which can be used for calculating the air velocity of diesel engine after-treatment of exhaust gas devices.Compared with the carbon balance method,the measurement method based on intake mass flow rate and fuel consumption is easier to achieve.
diesel engineafter-treatment of exhaust gasspace velocityexhaust gas floweffective volume