SISCIENGINES By: shivam qupta
About Me. . I am Shivam Gupta .Engineering in MECHANICAL STREAM Cleared 3 times GATE exam, UPSC CAPF AC, UPSC CDS,AFCAT and Engineering services written exam Love teaching , music and travelling. RATE,REVIEW, RECOMMEND AND SHARE . Follow me at :https://unacademy.com/user/Shivamgupta01
Otto Cycle : (Constant volume cycle) V- constant 3 iabat 4 tic V constant 'Swept volume Clearance volume
Otto cycle processes: P 1-2 Reversible Adiabatic or isentropic compression P 2-3 Constant volume heat addition P 3-4 Reversible Adiabatic or isentropic compression P:4-1 : constant volume heat rejection Adi 'Swept volume Clearance volume
Air standard efficiency of Otto cycle : Qr output 2Wnet Qs-0r input Now we know that Qs mCv(T3-T2)
m C v (T3 T2) 1- (T4-T1) (T3 T2) 7 T4 T1 4 T3 V constant T 2 For Adiabatic process 1-2 vY-1 constant
1-1 T1 V2 Ad and from adiabatic process 3-4 T3 V4 Clearance Swept volume volume Thus from above equations T2 T3 con T1 T4 4 T4 T3 V consta T1 T2
T1 ( T4- T1 T3 T2 (- 73) T2 T1 T2 T1 T2 ; Efficiency of Otto cycle - , -1
_1 Air standard efficiency of Otto Cycle .As compression ratio increases the efficiency of the Otto cycle increases. Limit of compression ratio is subjected to knocking phenomenon in SI engine. If compression ration become 1 then efficiency will be 0 "zero". .
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