Mixture formation and combustion process of a biodiesel fueled direct injection rotary engine (DIRE) considering injection timing, spark timing and equivalence ratio – CFD study

•3-D dynamic simulation model based on chemical kinetics reaction is established.•Simulation models based on biodiesel fuel is validated by experimental data.•Equivalence ratio, injection and spark timing effect on rotary engine are analyzed.•Preferred injection and spark timing are 80°CA(BTDC) and 35°CA(BTDC) respectively.•Preferred equivalence ratio is 0.8 under the computational condition.