From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Page of thermodynamic equations defining variables and calculations for work and scavenging.
| Identifier | ExFiles\Box 140\1\ scan0221 | |
| Date | 28th March 1938 guessed | |
| -17- W_Ec = { 1 - (1/r)^(k-1) } x w_c x J = work in ft. lbs. represented by area 2-3-4-5-2, where: r = V_2 / V_1 k = 1.4 (=Exponent of adiabatic compression and expansion) J = 777.7 ft. lbs. per B.t.u. (=Mechanical equivalent of heat) R = 53.34 (Gas constant for air) P = pressure in pounds per square inch. V = volume in cubic feet. W_Pc = 144 (P_2 - P_6)(V_2 - V_1) = work in foot pounds represented by area 1-2-6-7-1 W_Tc = W_Ec + W_Pc = total work in foot pounds for theoretical cycle with complete scavenging. For "normal scavenging. The symbols have the same significance as for complete scavenging. M_n = 144 P_2 (V_2 - V_8) / RT_2 = weight of charge, pounds V_8 = V_7 { (P_7 / P_8)^(1/k) } = volume of residual exhaust gas after it has been compressed to boost pressure by the incoming charge, cubic feet. Q_n = 1000 M_n W_En = { 1 - (1/r)^(k-1) } x Q_n x J.{Mr Johnson W.M.} W_Pn{Mr Northey} = 144 (P_2 - P_6)(V_2 - V_1) | ||