A THERNIODYNMWC STUDY OF THE TURBOJET ENGINE By BENJAMIN PIXKEL and IRVING 31. IGRP

Charts are presented for computing ~hru.st,fuel consumption, and other performance ca[ws of a turbojet engin;-~r any giren set of operating conditions and component eficzerwies. The e~eck of pressure losses in the inlet duc ~ arid the combustion chamber, of w-iation in physical properties of the gas as it passes through Me system, of reheating ofthe gas due to turbine losses, and of change in mass j?ou ~ by the addition ~f fuel are included. The principal performance chart s-hews the e~ects of primary rariablc ~ and corr~ction charts proride the <<fects @ ~ectrndary rarv”ables and oj turbine-loss reheat on the p@orm-ance ~f the system. In order to illustrate some of the turbojet-e ngine-performance charac~eristies, the thru~~per unit mass rate of air jio w and the dsec~fic fuel consumption are prewnkd-for a wide range of $ight and engine operating conditions. If is shoum that although fh.rwst per unit mass rate of air ~ou ~ increas-es u<th. increased co rrzbustion-chamber-oui%t &mpcr-ature? an optimum c(]xtbu.~tion<harnber-outiet temperature (rists Jor minirnurr speci~-e fuel consump~ion. This opt;mum tfirnpfrafure, in sornc cases, may be lew than the limifiing terrp(ratvre imposed by strength-temperature characteristics oj current materials. ~1~in~uence o ~ charac~eristics of a giwn compressor and twbirie on performance of a turbojet engine containing a matched set of these gicen components is discussed for cases of an engine with a cen~r<fugal-flow compressor and of arr engine with an azial-j?ou ~ compressor