My Scramjet

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  • 8/13/2019 My Scramjet


    ByHimanshu Gupta


    I have one speed,I have one Gear;


  • 8/13/2019 My Scramjet


    A scramjet (supersoniccombustion ramjet) is avariant of a ramjet air

    breathing combustionjet engine in whichcontinuous combustionprocess takes place insupersonic airflow.

    Requires forwardmotion to producethrust

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    Scramjets operate at

    hypersonic (>Mach 5)velocities, through flow

    and combustion takesplace at supersonic


    No operational systems,but a number of testflights and many ground


    Ramjets fly at high

    subsonic to supersonicspeeds but the airflow

    through them and theircombustion is subsonic


    Widely used for missiles,and on a few aircraft.

  • 8/13/2019 My Scramjet



    where incoming air iscompressed and

    decelerated. A COMBUSTOR, where

    gaseous fuel is burned with

    atmospheric oxygen to

    produce heat. A DIVERGING NOZZLE,

    where the heated air is

    accelerated to produce


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    Scramjet works on the same principle of Ramjet.

    All the operations are done by the varying cross section ofpassages.

    There are inlet passage, diffuser passage, combustion passage andexhaust passage.

    Basically in order to achieve the initial speed, a second engine is

    integrated in the Scramjet model, it may be rocket or turbojetengine.

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    As these are air breathing engines, air from the

    atmosphere enters at very high speed in the inletpassage.

    Hence the air from the atmosphere enters in the inlet

    section having very high velocity is reduced in

    diffuser section; thereby its static pressure increases.

    Temperature of air also increases when passingthrough the narrow cross section towards

    combustion chamber.

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    Hot air flows in the combustion chamber and at thismoment the propellant i.e. hydrogen (having a very

    low ignition temperature) as a fuel are injected by the

    injector in the combustor.

    Where it gets self ignited within a millisecond andthe combustion process is carried out at the

    supersonic speed.

    The fresh air supply to the diffuser builds up a

    pressure at the diffuser so that these burned gases

    cannot expand towards the diffuser.

    Instead, the gases are made expand in combustor

    towards tail engine hence providing the required

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  • 8/13/2019 My Scramjet


    Artist's conception of the NASA X-43with scramjetattached to the underside
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  • 8/13/2019 My Scramjet


    Ramjets and Scramjets have been used in

    missiles, helicopters, and the SR71 Blackbird withvarying degrees of success.
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    Does not have to carryoxygen

    No rotating parts makes

    it easier to manufacture

    Higher speed could meancheaper access to outerspace in the future

    Higher efficiencies

    Testing difficulties:-expensive launch

    vehicles, both of which

    lead to high

    instrumentation costs. A scramjet cannot

    produce efficient thrust

    unless boosted to high

    speed, around Mach 5,although depending on

    the design it could act as a

    ramjet at low speeds.

  • 8/13/2019 My Scramjet