. Applied thermodynamics for engineers. Fig. 1226. Art. 2956T ^ b ^r-^-^^^^^ »-^° .<<-l!^^ f3 d c m n Fig. 122c. Art. Fig. 122d. Art. 2956. Let P, = , Pa = 147, P„ = 294. ^ cc y/i ^^/i d ! / / 1/ / 6 Ad^ / i,-^^ c 1 1 f 1- 1 /^ iV N Then n — yn- 1 loo- = , ATKINSON ENGINE 179 Now if T, = 300° F. = 760° abs., T^ = 1470° abs., and if T^ = 3000° abs., theefficiency becomes 1530 - ( X 2-240) ^ 230 ^ ^ ^g1530 - ( X 1530) 640 ~ while that of the Otto cycle is Td--r,_ 1470-760 1470 = 296. Carnot Cycle and Otto Cycle; the
. Applied thermodynamics for engineers. Fig. 1226. Art. 2956T ^ b ^r-^-^^^^^ »-^° .<<-l!^^ f3 d c m n Fig. 122c. Art. Fig. 122d. Art. 2956. Let P, = , Pa = 147, P„ = 294. ^ cc y/i ^^/i d ! / / 1/ / 6 Ad^ / i,-^^ c 1 1 f 1- 1 /^ iV N Then n — yn- 1 loo- = , ATKINSON ENGINE 179 Now if T, = 300° F. = 760° abs., T^ = 1470° abs., and if T^ = 3000° abs., theefficiency becomes 1530 - ( X 2-240) ^ 230 ^ ^ ^g1530 - ( X 1530) 640 ~ while that of the Otto cycle is Td--r,_ 1470-760 1470 = 296. Carnot Cycle and Otto Cycle; the Atkinson Engine. Let abed,Fig. 123, represent a Carnot cycle drawn to py coordinates, and bfde, thecorresponding Otto cycle between thesame temperature limits, T and t. For theCarnot cycle, the efficiency is (T — t) -i- T;for the Otto, it is, as has been shown,(T,- T^) -V- T,. It is one of the disad-vantages of the Otto cycle, as shown inArt. 294, that the range of temperaturesduring expansion is the same as that dur-ing compression. In the ingenious Atkin-son engine (13), the fluid was contained inthe space between two pistons, which spacewas varied during the phases of the cycle. This permitted of expansionindependent of compression; in the ideal case, expansion continued downto the temperature of the atmosphere, giving such a diagram as ebcd, The entropy diagrams for the Carnot, Otto, and Atkinson cycles are correspondingly lettered in Fig. 124. Forthe Atkinson cycle, in the ideal case, wehave in Fig. 124 the elementary stripvwxy, wh
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