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Why is a purging process necessary for static firing test of liquid rocket engines?
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In Chapter 7 of Modern Engineering for Design of Liquid propellant Rocket Engines by Huzel and Huang, mentions the following engine cut off procedure.
The cutoff sequence usually consists of
shutoff of subsystems ....
... and, in the case of
test firings, postfiring securing (purges, flushes).
Why is it important to purge? And how is the system purged- only the fuel line or both the propellant feed lines?
liquid-fuel engineering testing engine development
asked 3 hours ago
karthikeyan
673314
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up vote
3
down vote
favorite
In Chapter 7 of Modern Engineering for Design of Liquid propellant Rocket Engines by Huzel and Huang, mentions the following engine cut off procedure.
The cutoff sequence usually consists of
shutoff of subsystems ....
... and, in the case of
test firings, postfiring securing (purges, flushes).
Why is it important to purge? And how is the system purged- only the fuel line or both the propellant feed lines?
liquid-fuel engineering testing engine development
asked 3 hours ago
karthikeyan
673314
add a comment |Â
up vote
3
down vote
favorite
up vote
3
down vote
favorite
In Chapter 7 of Modern Engineering for Design of Liquid propellant Rocket Engines by Huzel and Huang, mentions the following engine cut off procedure.
The cutoff sequence usually consists of
shutoff of subsystems ....
... and, in the case of
test firings, postfiring securing (purges, flushes).
Why is it important to purge? And how is the system purged- only the fuel line or both the propellant feed lines?
liquid-fuel engineering testing engine development
asked 3 hours ago
karthikeyan
673314
In Chapter 7 of Modern Engineering for Design of Liquid propellant Rocket Engines by Huzel and Huang, mentions the following engine cut off procedure.
The cutoff sequence usually consists of
shutoff of subsystems ....
... and, in the case of
test firings, postfiring securing (purges, flushes).
Why is it important to purge? And how is the system purged- only the fuel line or both the propellant feed lines?
liquid-fuel engineering testing engine development
liquid-fuel engineering testing engine development
asked 3 hours ago
karthikeyan
673314
asked 3 hours ago
karthikeyan
673314
asked 3 hours ago
karthikeyan
673314
asked 3 hours ago
karthikeyan
673314
asked 3 hours ago
karthikeyan
673314
673314
add a comment |Â
add a comment |Â
1 Answer
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Purging is done to remove residual fuel from the lines. This is normally done using nitrogen gas.
https://www.grc.nasa.gov/www/retf/textFiles/lessonsRocketEngineTesting.html
Residual fuel and oxidiser represents a combustion hazard - it could leak out or evaporate and start a fire. Also, if your oxidiser is something like nitric acid or dinitrogen tetroxide or (god forbid) some kind of fluorine-based oxidiser, that can create a severe safety hazard to the engineers working on or cleaning up the rocket engine after a test.
answered 28 mins ago
Ingolifs
846113
Thanks for the informative link. What I don’t understand is the requirement of a prestart purge mentioned?
– karthikeyan
6 mins ago
I guess that's to remove anything that accumulated in the time since it was last fired. Dust and mice and stuff. I may not remember this correctly, but in the book Ignition!, a rocket test firing disturbed a family of bats that had taken residence in a rocket chamber.
– Ingolifs
1 min ago
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
Purging is done to remove residual fuel from the lines. This is normally done using nitrogen gas.
https://www.grc.nasa.gov/www/retf/textFiles/lessonsRocketEngineTesting.html
Residual fuel and oxidiser represents a combustion hazard - it could leak out or evaporate and start a fire. Also, if your oxidiser is something like nitric acid or dinitrogen tetroxide or (god forbid) some kind of fluorine-based oxidiser, that can create a severe safety hazard to the engineers working on or cleaning up the rocket engine after a test.
answered 28 mins ago
Ingolifs
846113
Thanks for the informative link. What I don’t understand is the requirement of a prestart purge mentioned?
– karthikeyan
6 mins ago
I guess that's to remove anything that accumulated in the time since it was last fired. Dust and mice and stuff. I may not remember this correctly, but in the book Ignition!, a rocket test firing disturbed a family of bats that had taken residence in a rocket chamber.
– Ingolifs
1 min ago
add a comment |Â
up vote
2
down vote
Purging is done to remove residual fuel from the lines. This is normally done using nitrogen gas.
https://www.grc.nasa.gov/www/retf/textFiles/lessonsRocketEngineTesting.html
Residual fuel and oxidiser represents a combustion hazard - it could leak out or evaporate and start a fire. Also, if your oxidiser is something like nitric acid or dinitrogen tetroxide or (god forbid) some kind of fluorine-based oxidiser, that can create a severe safety hazard to the engineers working on or cleaning up the rocket engine after a test.
answered 28 mins ago
Ingolifs
846113
Thanks for the informative link. What I don’t understand is the requirement of a prestart purge mentioned?
– karthikeyan
6 mins ago
I guess that's to remove anything that accumulated in the time since it was last fired. Dust and mice and stuff. I may not remember this correctly, but in the book Ignition!, a rocket test firing disturbed a family of bats that had taken residence in a rocket chamber.
– Ingolifs
1 min ago
add a comment |Â
up vote
2
down vote
up vote
2
down vote
Purging is done to remove residual fuel from the lines. This is normally done using nitrogen gas.
https://www.grc.nasa.gov/www/retf/textFiles/lessonsRocketEngineTesting.html
Residual fuel and oxidiser represents a combustion hazard - it could leak out or evaporate and start a fire. Also, if your oxidiser is something like nitric acid or dinitrogen tetroxide or (god forbid) some kind of fluorine-based oxidiser, that can create a severe safety hazard to the engineers working on or cleaning up the rocket engine after a test.
answered 28 mins ago
Ingolifs
846113
Purging is done to remove residual fuel from the lines. This is normally done using nitrogen gas.
https://www.grc.nasa.gov/www/retf/textFiles/lessonsRocketEngineTesting.html
Residual fuel and oxidiser represents a combustion hazard - it could leak out or evaporate and start a fire. Also, if your oxidiser is something like nitric acid or dinitrogen tetroxide or (god forbid) some kind of fluorine-based oxidiser, that can create a severe safety hazard to the engineers working on or cleaning up the rocket engine after a test.
answered 28 mins ago
Ingolifs
846113
answered 28 mins ago
Ingolifs
846113
answered 28 mins ago
Ingolifs
846113
answered 28 mins ago
Ingolifs
846113
846113
Thanks for the informative link. What I don’t understand is the requirement of a prestart purge mentioned?
– karthikeyan
6 mins ago
I guess that's to remove anything that accumulated in the time since it was last fired. Dust and mice and stuff. I may not remember this correctly, but in the book Ignition!, a rocket test firing disturbed a family of bats that had taken residence in a rocket chamber.
– Ingolifs
1 min ago
add a comment |Â
Thanks for the informative link. What I don’t understand is the requirement of a prestart purge mentioned?
– karthikeyan
6 mins ago
I guess that's to remove anything that accumulated in the time since it was last fired. Dust and mice and stuff. I may not remember this correctly, but in the book Ignition!, a rocket test firing disturbed a family of bats that had taken residence in a rocket chamber.
– Ingolifs
1 min ago
Thanks for the informative link. What I don’t understand is the requirement of a prestart purge mentioned?
– karthikeyan
6 mins ago
Thanks for the informative link. What I don’t understand is the requirement of a prestart purge mentioned?
– karthikeyan
6 mins ago
I guess that's to remove anything that accumulated in the time since it was last fired. Dust and mice and stuff. I may not remember this correctly, but in the book Ignition!, a rocket test firing disturbed a family of bats that had taken residence in a rocket chamber.
– Ingolifs
1 min ago
I guess that's to remove anything that accumulated in the time since it was last fired. Dust and mice and stuff. I may not remember this correctly, but in the book Ignition!, a rocket test firing disturbed a family of bats that had taken residence in a rocket chamber.
– Ingolifs
1 min ago
add a comment |Â
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