Chapter 5 Gasoline fuel supply system Section 1 Fuel mixture formation and combustion a<0.8 or a >1.2,slow flame speed,incomplete combustion,poor economy, HC emissions increase and unstable work. 42 41 09 8 16 15 B 14 10.m0a19 410 340 270 1.00.90.8 Figure 5.2 The effects of mixture density on power and economy of gasoline engine (air throttle and speed are constant 械电子工程学酸 Automobile and Tractor Northwest A&F University Automobile and Tractor Northwest A&F University Chapter 5 Gasoline fuel supply system Figure 5.2 The effects of mixture density on power and economy of gasoline engine （air throttle and speed are constant ） α＜0.8 or α ＞1.2， slow flame speed, incomplete combustion, poor economy, HC emissions increase and unstable work. Section 1 Fuel mixture formation and combustion