Scramjet Shock train test at Vikram Sarabhai Space Centre`s test facility

[fsayed]

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[Nilgiri]

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I remember reading a paper on shock trains by some germans. Will have to dig that up and re-acquaint myself.

As far as I understand they arise because of a detached boundary layer phenomenon around the shock at various mach ranges.

They are useful in dual mode scramjet design IIRC (where the scramjet can operate in ramjet mode as well when subsonic). As far as I understand the precombustion shocktrain helps to create the necessary additional compression without the need for a restricting inlet (which would make a scramjet impossible because of permanent choked flow) in a conventional ramjet and thus is of great importance to a dual mode scramjet.

This characteristic is probably what ISRO is investigating here.

Glad to see they are this far along.

 

[fsayed]

I remember reading a paper on shock trains by some germans. Will have to dig that up and re-acquaint myself.

As far as I understand they arise because of a detached boundary layer phenomenon around the shock at various mach ranges.

They are useful in dual mode scramjet design IIRC (where the scramjet can operate in ramjet mode as well when subsonic). As far as I understand the precombustion shocktrain helps to create the necessary additional compression without the need for a restricting inlet (which would make a scramjet impossible because of permanent choked flow) in a conventional ramjet and thus is of great importance to a dual mode scramjet.

This characteristic is probably what ISRO is investigating here.

Glad to see they are this far along.

http://arc.aiaa.org/doi/abs/10.2514/1.32592

 

[dadeechi]

Mastering scramjet tech would be a huge game changer. very encouraging.

 

[Star Wars]

What is a scramjet shock test ?

 

[Nilgiri]

What is a scramjet shock test ?

Read my post earlier as well bhai.

Its checking the formation and preservation characteristics of the shock train.

Hopefully you understand with supersonic flows the air flow must be controlled (you will see this in fighter planes with external ramps like F-15, external cones like Mig 21 along with internal vanes on almost all of them).

If its subsonic flight only, then you can use a fixed geometry (its why say ramjets simply have a fixed inlet size and throat diameter...and also why commercial jet engines simply expose the LP spool with no fancy pre-compression needs).

Shock train in essence acts like a compressor for post sonic regime of airflow which is important for a scramjet to be able to operate at those velocities as a ramjet (dual mode)....but not be restricted in scramjet operation at speeds above say Mach 3 when you cannot have the permanent fixed geometry of a ramjet which would make scramjet operation impossible.

 

[Kinetic]

nice