Chapter 1 Gas Power Cycle

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Two Stroke Engine Power Compression Intake & Exhaust 1. Compression Stroke piston moves from BDC to TDC, compress air-fuel mixture. 2. Power Stroke piston at TDC, spark plug ignite the air-fuel mixture. After the piston is pushed to BDC. Meanwhile, about half way, combustion gases are discharged and fresh air-fuel mixture is drawing in . Actual and Ideal cycles in spark-ignition engine Actual four-stoke spark-ignition engine Ideal Otto cycle Under the Air-Standard Assumption
P Air Standard Otto Cycle Ideal Otto cycle consists of four internally reversible processes: Process 1-2 Isentropic Compression Process 2-3 v = constant, heat added Process 3-4 Isentropic expansion Process 4-1 v = constant, heat rejection 3 2 v 2 =v 3 Pv k = c Pv k = c w in w out 1 v 1 =v 4 TDC BDC Source: Assoc.Prof.Dr.Sommai Prepream 4 v T 1 2 v = const. v = const. q in q out s 1 =s 2 s3 =s 4 There are only 2-stroke of all 4-processes, Analysis of Air Standard Otto Cycle Constant volumeheat transfer 1 st v = const. ⇒ w = 0 Idealgas: and IsentropicProcessof Idealgases and law : closedsystem 2 2 2 q in 3 out k 3 = u − u + w 3 = 2 4 3 3 1 = P 3 k 1v1 2 2 q = u − u Pv q Pv RT, du = q = C (T −T ) k v v 3 = P 2 = q = q = C (T −T ) 1 3 k 2v2 C dT P ⎛ 2 v ⎞ ⎛ 1 V ⎞ 1 = ⎜ ⎟ = ⎜ ⎟ P1 ⎝ v2 ⎠ ⎝V2 ⎠ ( k−1) / k T ⎛ ⎞ ⎛ ⎞ 2 P2 v1 = ⎜ ⎟ = ⎜ ⎟ T1 ⎝ P1 ⎠ ⎝ v2 ⎠ 2 4 = constant k v k −1 P T 3 2 v 2 =v 3 1 Pv k = c 2 s 1 =s 2 3 4 Pv k = c v = const. v = const. w in q in q out s w out 4 1 v 1 =v 4 3 4 s3 =s 4 v s
Page 1 and 2: Chapter 1 Gas Power Cycle Content:
Page 3 and 4: Example 8.1 Show that the thermal e
Page 5: P Mean Effective Pressure, MEP Conc
Page 9 and 10: Example 8.2 An ideal Otto cycle has
Page 11 and 12: 1st law : closed system Ideal gas:
Page 13 and 14: Ideal Brayton Cycle Brayton Cycle c

Chapter 1 Gas Power Cycle

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