内燃机英语ppt.pptx

Otto cycle and Diesel cycle;What phenomenon can you see? Try to explain the reason. ;A heat engine that converts chemical energy in fuels into mechanical power, in which the heat source is the combustible mixture that also serves as the working fluid.;;Development;The classification of piston-type ICE;Four stroke Spark Ignition Engine Stroke 1: Fuel-air mixture introduced into cylinder through intake valve Stroke 2: Fuel-air mixture compressed Stroke 3: Combustion (roughly constant volume) occurs and product gases expand doing work Stroke 4: Product gases pushed out of the cylinder through the exhaust valve;Modern Two-Stroke Spark Ignition Engine Stroke 1: Fuel-air mixture is introduced into the cylinder and is then compressed, combustion initiated at the end of the stroke. Stroke 2: Combustion products expand doing work and then exhausted. ;A---Intake valve/Rocker arm/Spring B---Valve cover（气门室套） C---Intake port??进气口） D---Head（气缸盖） E---Coolant（冷却液） F---Engine block（机体） G---Oil pan（油底壳） H---Oil sump（油池） I---Camshaft（凸轮轴） J---Exhaust valve/Rocker arm/Spring K---Spark plug（火花塞或喷油器） L---Exhaust port（排气口） M---Piston（活塞） N---Connecting rod（连杆） O---Rod bearing（连杆轴承） P---Crankshaft（曲轴）;Actual cycle;Ideal cycle hypothesis;Sabathe cycle （Dual cycle ）;Otto Diesel ;Mean effective pressure, MEP;Otto cycle Diesel cycle;?;Otto cycle thermal efficiency;?;Answer: Increase in compression ratio results in: ? an increase in T for average heat addition and ? a decrease in T for average heat rejection;Comparison;;新普锐斯的发动机热效率超过40%，丰田怎么做到的？;1.提高废气再循环率（EGR）（Exhaust Gas Recirculation）;2.改变活塞表面形状;韩培洲. 大幅提高热效率的新结构节油内燃机. 国外内燃机, 2016, 48(5): 60-2.;Compression;Summary;Thank you !