21.jet engines

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INTERNAL COMBUSTION (I.C.) ENGINES JET ENGINES (RAMJET,SCRAMJET, PULSEJET) P.NEHA & T.DHANYASREE B.TECH – II YEAR AERONAUTICS INSTITUTE OF AERONAUTICAL ENGINEERING DUNDIGAL E-MAIL: [email protected] ABSTRACT: A jet engine is an air breathing internal combustion engine often used in high-speed aircraft. It is based on the principle of Newton’s third law. in some common usage the term jet engine generally refers to an internal combustion duct engine which typically consists of an engine with a rotary (rotating) air compressor powered by a turbine(Brayton cycle) with the left over power providing thrust via a propelling nozzle. These types of jet engines are p rimarily used by jet aircraft for long distance travel.. The types of jet engines are 1.Turbojet 2. Turboprop 3.Turbofan 4.Ramjet 5.Scramjet 6.Pulsejet This paper presents a brief description of Ramjet, Scramjet & Pulsejet. Ramjet (Aerodynamic ram compression) does not consists of any rotating machinery .It is a very simple device. It uses the open Brayton cycle pulse jet (unsteady dynamic compression). It is a very simple form of I.C. engine based jet engine where combustion o ccurs in  pulses. Due to the problem faced in Ramjet, the concept of supersonic combustion ramjet i.e. scramjet came into picture. The above mentioned jet engines helps to give high speed as well as over long distance giving better fuel efficiency then many other forms of transport. In jet engine applications, the work is in producing compressed air and combustion, which are then accelerated to provide reaction propulsion. It is used as aircraft engines for jet aircraft. They are also used for cruise missiles and unmanned airvehicles. They are used for fireworks, model rocketry space flight and military missiles. Jet engine converts thermal energy into useful work.

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