Questions about military jets.....

gay_pilot18 · October 19th, 2003, 15:54

Okay guys I'm doin a class project. Were supposed to design a new airplane.

It can be an airline type airplane or a military type plane. Well I choose to to create a supersonic air-air to fighter.

My question is this. I was considering putting afterburning " high bypass" engines on my supersonic interceptor.

Now my instructor is kinda strict he doesn't just allow us to just make stuff up.

So would afterburning high bypass engines work out well for a supersonic capable military interceptor, verses low bypass afterburning engines?

If so what would be the major differences (pro's and cons) between the two types high bypass afterburners vs. low bypass afterburners on a supersonic fighter?

And lastly are high bypass afterburing engines even a reality?

Thanks guys in advance.

Everett

viper548 · October 19th, 2003, 16:05

I think high bypass engines would create too much drag to be possible.

Go buy Aerodynamics for Naval Aviators if you don't already have it. It's got tons of info about design and how it effects performance

gay_pilot18 · October 20th, 2003, 20:18

Well how would "high bypass" afterburning engines create drag?

Everett

chunk75 · October 21st, 2003, 01:16

I'm pretty sure the F404/F110 is a hig-bypass afterburning turbofan. Wouldn't it be less drag to go throgh the single fan than all the compressor stages?

Do some research here....

http://www.geae.com/engines/military/index.html

aloft · October 21st, 2003, 16:43

The powerplants in most modern fighter aircraft are classified as medium-bypass turbofans. I'm not aware of any high-bypass afterburning engine, I'm wondering if the bypass air is hot enough to ignite the fuel. I suspect not. On top of that, you've got size, drag, and radar cross-section issues.

RiddlePilot · October 21st, 2003, 17:07

Don't forget about shockwave issues as well. You'd lose a horrible amount of efficiency at supersonic speeds with a higher bypass turbofan as the air hit the fan. I'm sure it's feasable if you designed a veeery efficient inlet duct, but is it worth the trouble?

Minuteman · October 21st, 2003, 22:09

[ QUOTE ]
Don't forget about shockwave issues as well. You'd lose a horrible amount of efficiency at supersonic speeds with a higher bypass turbofan as the air hit the fan. I'm sure it's feasable if you designed a veeery efficient inlet duct, but is it worth the trouble?

[/ QUOTE ]
Ever notice how all of Boeing's Sonic Cruiser drawings never show the inlets?

October 19th, 2003, 15:54	#1
gay_pilot18 Junior Member Join Date: Apr 2003 Location: Cincinnati/Mason OH. (CVG) Posts: 241	Questions about military jets..... Okay guys I'm doin a class project. Were supposed to design a new airplane. It can be an airline type airplane or a military type plane. Well I choose to to create a supersonic air-air to fighter. My question is this. I was considering putting afterburning " high bypass" engines on my supersonic interceptor. Now my instructor is kinda strict he doesn't just allow us to just make stuff up. So would afterburning high bypass engines work out well for a supersonic capable military interceptor, verses low bypass afterburning engines? If so what would be the major differences (pro's and cons) between the two types high bypass afterburners vs. low bypass afterburners on a supersonic fighter? And lastly are high bypass afterburing engines even a reality? Thanks guys in advance. Everett

October 19th, 2003, 16:05	#2
viper548 Senior Member Join Date: May 2003 Location: Colorado Springs Posts: 818	Re: Questions about military jets..... I think high bypass engines would create too much drag to be possible. Go buy Aerodynamics for Naval Aviators if you don't already have it. It's got tons of info about design and how it effects performance

October 20th, 2003, 20:18	#3
gay_pilot18 Junior Member Join Date: Apr 2003 Location: Cincinnati/Mason OH. (CVG) Posts: 241	Re: Questions about military jets..... Well how would "high bypass" afterburning engines create drag? Everett

October 21st, 2003, 01:16	#4
chunk75 Senior Member Join Date: Jul 2001 Location: FL Posts: 922	Re: Questions about military jets..... I'm pretty sure the F404/F110 is a hig-bypass afterburning turbofan. Wouldn't it be less drag to go throgh the single fan than all the compressor stages? Do some research here.... http://www.geae.com/engines/military/index.html

October 21st, 2003, 16:43	#5
aloft Old Skool Join Date: Sep 2001 Location: Inside your OODA loop Posts: 7,148	Re: Questions about military jets..... The powerplants in most modern fighter aircraft are classified as medium-bypass turbofans. I'm not aware of any high-bypass afterburning engine, I'm wondering if the bypass air is hot enough to ignite the fuel. I suspect not. On top of that, you've got size, drag, and radar cross-section issues.

October 21st, 2003, 17:07	#6
RiddlePilot Senior Member Join Date: Apr 2003 Location: Prescott, AZ Posts: 928	Re: Questions about military jets..... Don't forget about shockwave issues as well. You'd lose a horrible amount of efficiency at supersonic speeds with a higher bypass turbofan as the air hit the fan. I'm sure it's feasable if you designed a veeery efficient inlet duct, but is it worth the trouble?

October 21st, 2003, 22:09	#7
Minuteman Old Skool Join Date: May 2003 Location: Austin, TX Posts: 1,594 Blog Entries: 1	Re: Questions about military jets..... [ QUOTE ] Don't forget about shockwave issues as well. You'd lose a horrible amount of efficiency at supersonic speeds with a higher bypass turbofan as the air hit the fan. I'm sure it's feasable if you designed a veeery efficient inlet duct, but is it worth the trouble? [/ QUOTE ] Ever notice how all of Boeing's Sonic Cruiser drawings never show the inlets?

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