Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
 
Articles by M.H. Djavareshkian
Total Records ( 4 ) for M.H. Djavareshkian
  M.H. Djavareshkian , F. Talati , A. Ghasemi and S. Sohrabi
  In this research, combustion process in the combustion chamber of a DI diesel engine is simulated. Afterwards, results obtained from the multidimensional simulation of the combustion process are used in analytical solution of the heat conduction in cylinder wall. An eddy break-up combustion model and a diesel auto-ignition model were implemented to simulate the ignition and combustion process. All the simulations were carried out by the use of FIRE CFD tool. Numerical results were validated via experimental data for OM_355 DI diesel engine for mean cylinder pressure. The results show that there have been good agreements between experimental data and the CFD calculations. The research demonstrated that the combination of multidimensional CFD simulation and analytical methods is useful for diesel engine wall heat transfer modeling. Effect of cylinder wall material, insulation material and thickness were studied in order to obtain lower heat rejection from the combustion chamber. Using cast iron instead of alluminium for cylinder material, using insulation and increasing the insulation thickness resulted in lower outer wall temperature and heat flux.
  M.H. Djavareshkian and M. Farnak
  A pressure based implicit procedure to solve the Euler equations on a nonorthogonal mesh with collocated finite volume formulations is described which uses pressure as a working variable. The boundedness criteria for this procedure are determined from Uniformly high order accurate Non Oscillatory (UNO) schemes, which are based on characteristic variables and are applied to the fluxes of the convected quantities directly, including mass flow rate. The developed scheme is applied to the computation of steady transonic and supersonic flow over a bump in channel geometry for various Mach number as well as to the transient shock tube problem. Also the results of steady supersonic flow over a ramp are presented. Then the results are compared with data predicted by TVD schemes based on characteristic variables.
  A. Ghasemi and M.H. Djavareshkian
  The objective of this study is to simulate combustion process, pollutant formation and flow field in the combustion chamber of a DI diesel engine converted to work as a dual fuel (Diesel/Natural gas) engine. Effect of natural gas equivalence ratio, in constant diesel pilot injection and piston bowl shape, on the combustion process, pollutant formation and flow field are investigated in 5 cases defined. An eddy break-up combustion model and a diesel auto-ignition model were implemented to simulate the ignition and combustion processes. Experiments were performed on OM_355 DI diesel engine to validate the simulations. Results show that there have been good agreements between experiments and the CFD calculations.
  M.H. Djavareshkian and A. Ghasemi
  The objective of this study, is to simulate spray flow with different break-up models and investigate the processes of spray breakup and mixture formation. Effect of these models on the DI diesel engine combustion and performance is also investigated. The 3 Dimensional Naiver-Stokes equation is solved with SIMPLEC algorithm. An eddy break-up combustion model and a diesel auto-ignition model were implemented to simulate the ignition and combustion process in a diesel engine. All the simulations were carried out by the use of FIRE CFD tool. Results were validated via., available experimental data for OM_355 DI diesel engine for mean cylinder pressure. The results show that there have been good agreements between experiments and the CFD calculations. The research demonstrated that practically all the break-up models are capable of simulating the spray processes, as long as model constants are properly chosen and they affect the combustion simulation results.
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility