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LENOIR CYCLE AND ITS PROCESS

 The lenoir Cycle consists of  the following processes 

 Constant volume heat addition (1-2); 

 Reversible adiabatic expansion (2-3);

 Constant pressure heat addition (3-1).




 The Lenoir cycle is applicable to pulse Jet Engines.

 For 1kg gas, 

Q1 = Cv(T2-T1)

Q2 = Cp(T3-T1)

N cycle = 1- (Q2 / Q1) =  1- ((Cp(T3-T1) / Cv(T2-T1)) = 1- (Y (T3-T1) / (T2 - T1))

Using rp = (P2 / P1)

(p1v1 / T1) = (p2 v2 / T2)

T2 = T1 (p2 / p1) = rp.T1

(T3 / T2)  = (p3 / p2)^((y-1) / y) = (p1 / p2) ^((y-1) / y)

T3 = T2 (1 / rp)^ ((y-1) / y) 

    = T1 rp (1 / rp) ^((y-1) / y)

N (lenoir) = 1 - Y (((rp^(1/y)) - T1 ) / (rp-1))

Thus, the cycle efficiency depends on the pressure ratio and specific heat ratio. 

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