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DRDO and PSU's
- Thread starter 125mm_Smoothbore
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In context of ground test run of HAL Warrior and it "lack" of stealth shaping and serrations, it could be that they will be added for the in-production vehicles and they wanted to fly & test out the "simpler" version first. But, it's possible that what I had been saying about the "fall" in importance of shapes and "rise" in importance of the materials (RAM, RAS, paints/coats) in stealth vehicles going forward is starting to happen.
Why would a designer pay the aero-dynamic penalties of "stealth-shaping" when some materials can give a -20dB (99%) reduction over a broadband C,X and Ku band and -10dB (90%) over the whole range of 38GHz band of frequencies?
So, low drag more manuverable designs with newer materials will be just as stealthy as older less kinematic performance designs with shaping.
I usually post about RAMs. But I have been reading up on Thermal Barrier Coatings (TBCs) lately.
I always wondered is there a limit to how much rising the Turbine Entry Temp (TeT) can increase performance and if there was an upper limit to it. In the CAPS talk, GTRE director talked about
"gas adiabatic temp of hydrocarbons in air". I looked into it, turns out 2220 deg K (1950 deg C) is the gas adiabatic temp of hydrocarbons in air. So, there is no point in hitting temp above this ~2000 deg C is the highest temp a gas turbine aero-engine needs to achieve.
In that context, I saw a research going on in IIT Patna where they realized a TBC which survives something near 2000 thermal cycles at 1800 deg C (2073 deg K) with no major problems (like spallation). There was also an interesting work on a bond-coat less TBC (lighter) with CNTs which also shows 48 cycles at 1800 degC.
Why would a designer pay the aero-dynamic penalties of "stealth-shaping" when some materials can give a -20dB (99%) reduction over a broadband C,X and Ku band and -10dB (90%) over the whole range of 38GHz band of frequencies?
So, low drag more manuverable designs with newer materials will be just as stealthy as older less kinematic performance designs with shaping.
I usually post about RAMs. But I have been reading up on Thermal Barrier Coatings (TBCs) lately.
I always wondered is there a limit to how much rising the Turbine Entry Temp (TeT) can increase performance and if there was an upper limit to it. In the CAPS talk, GTRE director talked about
"gas adiabatic temp of hydrocarbons in air". I looked into it, turns out 2220 deg K (1950 deg C) is the gas adiabatic temp of hydrocarbons in air. So, there is no point in hitting temp above this ~2000 deg C is the highest temp a gas turbine aero-engine needs to achieve.
In that context, I saw a research going on in IIT Patna where they realized a TBC which survives something near 2000 thermal cycles at 1800 deg C (2073 deg K) with no major problems (like spallation). There was also an interesting work on a bond-coat less TBC (lighter) with CNTs which also shows 48 cycles at 1800 degC.
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