Abstract This chapter handles the first group of jet engines, namely, Ram-Based Engines, which includes pulsejet, ramjet, and scramjet engines. All the three types are composed of three stationary modules, namely, intake (or inlet), combustion chamber, and nozzle. Moreover, this category of engines cannot provide a static thrust and so never used alone in takeoff phase. A brief historical review for each engine is first given. Next both aerodynamic and thermodynamic analyses are given. The endeavor of these analyses is to calculate the generated thrust, fuel consumed, TSFC, specific impulse as well as the three efficiencies: propulsive, thermal, and overall. Pulsejet engines are divided into three groups, namely valved, valveless, and pulse detonation engines. The first two types are governed by Humphrey cycle. Noise and excessive fuel consumption are the main reasons for ceasing its usage except for some military applications. However, recent interest in pulse detonation types arose, though still in the research and testing phases. Ramjet engines are used both in aircrafts and missiles. It may be classified either as subsonic or supersonic types, nuclear or non-nuclear types, as well as solid and liquid fueled types. Combustion in all types is limited to subsonic speeds. Recently, a double throat type is invented for which detailed description and analysis is also given. When flight speed is at the higher range of supersonic domain and merges with hypersonic one, scramjet engine is a necessity. Scramjet stands for a Supersonic Combustion Ramjet. It is still in the research phase with prototype testing. An isolator is added to the basic three modules of Ram-Based Engines in dual mode scramjet. Analysis of classical scramjet as well as that fitted with isolator is given. Numerous examples that clarify performance of each engine are thoroughly treated.
Pulsejet, Ramjet, and Scramjet Engines
01.01.2016
87 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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