2016年5月26日 · It's also an expendable resource which puts limits on the number of times an engine can be started in flight; the Falcon 9 only loads TEA-TEB for restarts on those engines that will be restarted on a given mission, reasonably enough, but this makes it susceptible to engine failures in the reentry and landing burns that could otherwise be ...

Based on the aborted launch on Thanksgiving 2013 of the first Falcon 9 v1.1 from Florida, we know that an issue occurred where oxygen got into the ground based TEA-TEB sources. I understand that TEA-TEB are pyrophoric , which means they combust on contact. SpaceX reported they replaced the gas generator on the center engine.

2017年12月12日 · For the TEA-TEB lines to have frozen from exposure to LOX boiloff, it's likely that they were in proximity to the GOX vent. Since the LOX tanks and the GOX vent are both located in the fuselage, one would presume the tanks from which the TEA-TEB lines are originating would have to be in the fuselage as well.

2016年5月25日 · $\begingroup$ I have one "wild" theory - The valve is probably not directly adjacent to the chamber, so there is a nontrivial length of plumbing containing unburnt TEA-TEB which, after the valve closes, has less pressure than the fuel+LOX being pumped and burned in there. What if this residual amount starts dripping after the engine is stopped ...

2016年2月7日 · Another speculation on my part: because SpaceX uses 1-3 or 1-3-1 scheme for multi-engine landing burns and according to currently public information both outer engines failed to ignite, it seems reasonable that there is just one common reservoir of the TEA-TEB mixture per stage, supplying all 3 restartable engines, instead of a reservoir per ...

2016年5月25日 · The Merlin engines are ignited with a mixture of triethylaluminium and triethylborane (TEA-TEB); according to Wikipedia: Triethylborane is strongly pyrophoric, igniting spontaneously in air, burning with an apple-green flame characteristic for boron compounds. Thus, it must be handled and stored in nitrogen or argon.

2018年2月7日 · The answer given by Musk in the post launch conference call was that they ran out of the TEA-TEB igniter fluid, which is used to start or restart the engines. On the ground, the TEA-TEB is externally provided for launch to start all 27 engines. For landing attempts, only 3 engines are equipped with TEA-TEB to allow restarting.

2021年3月2日 · SpaceX's Falcon 9 uses TEA-TEB as a ignitor for its Merlin engines. My question is if the rocket has more TEA-TEB, can the engine be shut down and restarted more than 4 times?

2020年2月25日 · I know that SpaceX's Falcon uses TEA-TEB instead of a physical igniter, but if I remember correctly, NASA has never used hypergolic propellants to start their restart-able engines. How does NASA's (or ULA's, or Arianne's) rockets/payloads (such as the LEM) that require re-ignition achieve it without the igniter melting?

But if an engine failed to ignite via TEA-TEB would the fact the other engines are rapidly burning ignite the Kerosene and LOX that would be pumping out of the unstarted engine? I am sure they would shut the stack down when the sensors detect a failed start, but would the missed engine actually start from external ignition sources?