03-04-2010, 03:21 AM
[quote name='qubit' date='03 March 2010 - 10:59 PM' timestamp='1267636873' post='104781']
Ankit-S, with all humility, your statement DRDO is capable of handling scramjet tech doesn't translate into what I said above i.e. DRDO can develop and manufacture a modification of the BrahMos-II having a range of 500-1000+ km and within 5+ years. I'll be more than happy if I were proven wrong. So, do you have (or know where one can find) more deailed actual performance figures and dimensions of the scramjet tested by DRDO, publications, etc...? Naturally, the present state of development would not be advertized, but one can draw ballpark estimates via conservative extrapolation.
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AVATAR is an even longer way off!
I agree that it IS...but you must agree TO the basic fact that AVTAR is not a missile, and its even more complex than what you think of missiles because it is single-stage REUSABLE Rocket plane capable of horizontal takeoff and landing. If DRDO has quasi perfected a Scramjet for that, then it speaks volume for your answers to be delivered. Because single-stage REUSABLE rocketplane capable of horizontal takeoff and landing is a complex technology akin to space shuttle, missiles are not that complex to maneuver.
BTW, in a BrahMos-II, wouldn't the Mach number of the flow into the scramjet exceed Mach 2? Just asking!
Ankit-S, with all humility, your statement DRDO is capable of handling scramjet tech doesn't translate into what I said above i.e. DRDO can develop and manufacture a modification of the BrahMos-II having a range of 500-1000+ km and within 5+ years. I'll be more than happy if I were proven wrong. So, do you have (or know where one can find) more deailed actual performance figures and dimensions of the scramjet tested by DRDO, publications, etc...? Naturally, the present state of development would not be advertized, but one can draw ballpark estimates via conservative extrapolation.
[/quote]
AVATAR is an even longer way off!
I agree that it IS...but you must agree TO the basic fact that AVTAR is not a missile, and its even more complex than what you think of missiles because it is single-stage REUSABLE Rocket plane capable of horizontal takeoff and landing. If DRDO has quasi perfected a Scramjet for that, then it speaks volume for your answers to be delivered. Because single-stage REUSABLE rocketplane capable of horizontal takeoff and landing is a complex technology akin to space shuttle, missiles are not that complex to maneuver.
BTW, in a BrahMos-II, wouldn't the Mach number of the flow into the scramjet exceed Mach 2? Just asking!
Quote:The minimum Mach number at which a scramjet can operate is limited by the fact that the compressed flow must be hot enough to burn the fuel, and of high enough pressure that the reaction is finished before the air moves out the back of the engine. Additionally, in order to be called a scramjet, the compressed flow must still be supersonic after combustion. Here two limits must be observed: Firstly, since when a supersonic flow is compressed it slows down, the level of compression must be low enough (or the initial speed high enough) not to slow the gas below Mach 1. If the gas within a scramjet goes below Mach 1 the engine will "choke", transitioning to subsonic flow in the combustion chamber. This effect is well known amongst experimenters on scramjets since the waves caused by choking are easily observable. Additionally, the sudden increase in pressure and temperature in the engine can lead to an acceleration of the combustion, leading to the combustion chamber exploding.
Secondly, the heating of the gas by combustion causes the speed of sound in the gas to increase (and the Mach number to decrease) even though the gas is still travelling at the same speed. Forcing the speed of air flow in the combustion chamber under Mach 1 in this way is called "thermal choking". It is clear that a pure scramjet can operate at Mach numbers of 6-8, but in the lower limit, it depends on the definition of a scramjet.