منحنى أداء محرك الساحبة ماسي فيركسون S )‎ 285 MF )‎ عند مستويات مختلفة لسرع المحرك و نوع دورة التبريد

الملخص EN

An experiment was conducted at the department of machinery and equipment in the Kufa Technical Institute , to study the effect of engine speed and type of the coolant system cycle on the performance, emission of exhaust gases and noise level of Massey Ferguson MF 285 S tractor engine .The engine speed factor included several levels ranged between 1000 and 2400 rpm, with steady increments of 100 rpm for each level.

However , the coolant system cycle factor included two types , these were the normal coolant cycle and another one with a short cycle in which a portion of hot water return to mix with the cold water coming from the radiator to the engine .

A completely randomized design in a factorial experiment with three replications was used .The differences between means were testing with LSD test at 0.05 probability level.

The results indicated that the increase in engine speed levels have a significant improvements in all indicators of performance, this was clear at the increase in the PTO p until the rated engine speed was reached .

However these improvements retreated significantly when the engine speed passed the rated speed .

Also the increase in engine speed led to a significant increase in the emission of CO and pm , while a significant decreased in CO2 ,NOX and O2 was observed.

On the other hand the same trend was noticed in relation to the noise level .

The results also indicated that the addition of the short cycle to the normal cooling system led to a significant improvements in performance indicators PTOp and torque, while the specific fuel consumption was decreased significantly .

However in relation to the emission factor the use of short cycle reduced the CO , NOX,PM and O2 significantly, otherwise the CO2 increased .

The addition of the short cycle resulted in a significant decreases in noise level.