HGDT Guide

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
Nate55123
Private
Private
United States of America
Posts: 3
Joined: Thu Nov 23, 2023 1:27 pm

Thu Nov 23, 2023 9:15 pm

Does anyone have a access to the documentation for HGDT? Or can someone help me understand the software? The archive for GGDT works fine and I've used that plenty, but I have not used HGDT and I don't know what all the inputs and outputs are. I tried looking at the archive with no luck.

Thanks!
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 318 times

Donating Members

Tue Nov 28, 2023 12:35 pm

Do you have any specific questions? What are you trying to model exactly?
hectmarr wrote:You have to make many weapons, because this field is long and short life
Nate55123
Private
Private
United States of America
Posts: 3
Joined: Thu Nov 23, 2023 1:27 pm

Wed Nov 29, 2023 1:21 am

jackssmirkingrevenge wrote:
Tue Nov 28, 2023 12:35 pm
Do you have any specific questions? What are you trying to model exactly?
I found most of what I needed after digging through the forum. I'm still not entirely sure about the mix(Nx) input? What exactly is that? And does HGDT use a set ratio of fuel to air?

Thanks!
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 318 times

Donating Members

Wed Nov 29, 2023 3:29 pm

Nate55123 wrote:
Wed Nov 29, 2023 1:21 am
I'm still not entirely sure about the mix(Nx) input
It's shorthand for the pressure before firing.

If your mix of fuel and air is pressurized to 150 psi, then that's approximately 10 times atmospheric pressure so your input value should be 10.

For an unpressurized basic combustion cannon this value should be 1.
And does HGDT use a set ratio of fuel to air?
I believe a stoichiometric mix ratio is assumed depending on the chosen fuel.
hectmarr wrote:You have to make many weapons, because this field is long and short life
Nate55123
Private
Private
United States of America
Posts: 3
Joined: Thu Nov 23, 2023 1:27 pm

Thu Nov 30, 2023 12:46 am

jackssmirkingrevenge wrote:
Wed Nov 29, 2023 3:29 pm
Nate55123 wrote:
Wed Nov 29, 2023 1:21 am
I'm still not entirely sure about the mix(Nx) input
It's shorthand for the pressure before firing.

If your mix of fuel and air is pressurized to 150 psi, then that's approximately 10 times atmospheric pressure so your input value should be 10.

For an unpressurized basic combustion cannon this value should be 1.
And does HGDT use a set ratio of fuel to air?
I believe a stoichiometric mix ratio is assumed depending on the chosen fuel.
Perfect. Thank you!
User avatar
D_Hall
Staff Sergeant 5
Staff Sergeant 5
United States of America
Posts: 1907
Joined: Thu Feb 07, 2008 7:37 pm
Location: SoCal
Has thanked: 6 times
Been thanked: 36 times

Donating Members

Mon Dec 11, 2023 9:29 pm

jackssmirkingrevenge wrote:
Wed Nov 29, 2023 3:29 pm
I believe a stoichiometric mix ratio is assumed depending on the chosen fuel.
Correct. I am NOT going to loop in PEP or any similar combustion codes!
Simulation geek (GGDT / HGDT) and designer of Vera.
Post Reply