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Both specific fuel consumption and specific impulse, Xirhen applied to rockets, include as fuel consigned the total weight of" fuel and oxidant (for example alcohol and liquid -oxygen) . , -6- The rati-o of the weight of the power plant to the thrust which it develops is significant only when the operating conditions under which the thrust is developed are stated.' Bor most turbo-jet engines at sea level the, ratio is in the range O.3 to 0.6. In the literature on jet propulsion, frequent use is made of the term Mach number, which is simply the ratio of the velocity under consideration to the velocity of sound in gas at the same temperature. For example if a ram jet is flying at l^OO mi/hr through air in which the velocity of sound is 750 mi/hr, the unit is said to he traveling at a Mach number of two. HIGBABLE FIELDS OF APPLICATION OF JET ENGINES Section II—A of the following bibliography refers to many reports dealing with the ranges of speeds and altitudes at which the various types of jet engines have specific advantages over other types. Much of this information, particularly that involving flight velocity, has bean summarized in a chart prepared by the Douglas Aircraft Co. This interesting and self-explanatory figure is included in the present report through the courtesy of the El Segundo Engineering Department of Douglas. SUPPLEMENTS TO LCS72 The number of books and papers appearing on the general, subject of jet propulsion is large, particularly . during the present time when the results of wartime research are being released for publication. It is planned, there- fore, to issue supplements to the present bibliography semiannually, in January and July. Beginning with January 1948, those possessing LCS72 who are interested in-receiving supplements thereto should address such requests to the Publication Section, National Bureau of Standards, Washington 2S D. C. , This bibliography does not contain references on' the design and perform- ance of compressors and turbines, nor does it include translations of captured German documents. It is believed that the latter are not yet. generally, avail- able, and that, the more important ones will be reviewed in the literature as time goes by. Since the jet engine and the gas turbine may, in the future, utilize energy from nuclear fission, references in this field are included.PDF Image | GAS TURBINES AND JET PROPULSION INTRODUCTION 1947
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