Cylinder head valves
Ports
Turbo chargers
Bleeder valves
第1题：
第一组： The Wartsila 50DF operates on the lean-bum principle: the mixture of air and gas in the cylinder has more air than is needed for complete combustion. Lean combustion reduces peak temperatures and therefore NOx emissions. Efficiency is increased and higher output is reached while avoiding knocking. Combustion of the lean air-fuel mixture is initiated by injecting a small amount of LFO (pilot fuel) into the cylinder. The pilot fuel is ignited in a conventional diesel process, providing a high-energy ignition source for the main engine. To obtain the best efficiency and lowest emissions, every cylinder is individually controlled to ensure operation at the correct air-fuel ratio and with the correct amount and timing of pilot fuel rejection. Wartsila has developed a special electronic control system to cope with the demanding task of controlling the combustion in each cylinder, and to ensure optimal performance in terms of efficiency and emissions under all conditions by keeping each cylinder within the operating window. Stable and well-controlled combustion also contributes to less mechanical and thermal load on the engine components. Current stringent emission regulations demand the reduction of NOx emissions. In an internal combustion engine this means controlling peak temperature and residence time, which are the main parameters governing NOx formations. In the Wartsila 50DF engine, the air-fuel ratio is very high (typically 2.2). Since the same specific heat quantity released by combustion is used to heat up a larger mass of air, the maximum temperature and consequently NOx formation are lower. The mixture is uniform. throughout the cylinder since the fuel and air are premixed before introduction into the cylinders, which helps to avoid local NOx formation points within the cylinder. Benefiting from this unique feature, NOx emissions from the Wartsila 50DF are extremely and comply with the most stringent existing legislation.
What is the combustion feature of the Wartsila 50DF?
A.Lean air in the cylinder
B.Excessive fuel in the cylinder
C.Excessive air in the cylinder
D.Spark ignition
第2题：
Diesel engines obtain combustion air through turbo chargers，blowers，or ______．
A.Air starters
B.Carburetors
C.Natural aspiration
D.Air receivers
第3题：
Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ____.
A.prolong the ignition delay period
B.ensure the beginning of fuel injection
C.thoroughly utilize the air charge
D.allow controlled fuel combustion
第4题：
delivering more air into the cylinder than it would normally receive during an ordinary charging process
forcing the products of combustion out of the cylinder with the fresh air charge
collecting the air charge at the cleaner
combustion and expansion of hot gas
第5题：
provide a reservoir for cylinder lubrication
pump oil into the combustion space for cylinder cooling
prevent excessive lubricating oil consumption
allow hydraulic oil film formation on the cylinder
第6题：
If the engine does start on air, but combustion does not immediately begin, the cause may be _____.
A.failure of the fuel pumps
B.starting air pressure too low
C.stop valve in air line closed
D.the turning gear still engaged
第7题：
How does combustion air enter the cylinder of a two-cycle diesel engine ? Through _______．
A.Cylinder head valves
B.Ports
C.Turbo chargers
D.Bleeder valves
第8题：
A.Close the inlet and outletvalves for diesel oil
B.Open the air nozzles in the secondary combustion chamber until it stops
C.Open the air nozzles in the primary combustion chamber until it stops
D.Close inlet valve for pressurized air
第9题：
check the cylinder exhausts for black smoke
listen for combustion knock in that cylinder
isolate each cylinder and inspect the injector
check the cylinder exhaust temperature frequently
第10题：
low compression
failure of the fuel pump to discharge fuel
incorrect timing of fuel pump
turning gear being still on