Stationeers Rocketry: Pressure Fed Liquid Engine

Pressure Fed Liquid Engine This is the most complex and arugably the most powerful engine. It uses a bit more fuel compared to the pumped liquid engine, but it puts out significantly more thrust because of it. Because this engine pulls in both liquids and pressurant gases, it is very difficult to get the exact molar ratio for an optimal burn when you factor the gas and liquid composition. The engine does however pull predominantly liquids so you can get away with making the liquid be the correct composition and take a small hit with however much pressurant gas the engine takes in. I go over two options for making one work, Using the heat exchanger or using a pressurant valve. My main recommendation is to have both liquid oxidizer and liquid combustible gas present and mix both to the engine pipe network via a script and liquid volume pumps. You can get the molar ratio correct in this way. As for getting pressure to make the engine work well, you can warm up the fuel to make one of the liquids evaporate to get the pressure or you can use a pressurant valve. There are benefits and drawbacks to either method as well as what fuels can be used. Fuel Types: it can use any fuel mix, but I separate them into a stable or unstable mix. Stable fuel mixes are where both liquids can exist at the same temperature and pressure. This means the liquids can be mixed and one of them is the pressurizing gas so that the engine can have a good fuel. An unstable mix is one where only one can be a liquid at once because the other either freezes or fully evaporates at the desired condition. Because the engine pulls predominantly liquids, you cant use one to pressurize the other. You can however take advantage of the fact that not all the liquids will evaporate at once, so you can mix the liquids into the engine pipe as the engine is running. Doing so requires using the heat exchanger to ensure one doesnt freeze and you use a purge valve to prevent overpressurization as one begins to fully evaporate. It is very tricky to work with. I wont go over the code logic, but it is on steam for the original volatiles + oxygen or Volatiles + Nitrous engine scripts. I will update the scripts so you could use those and modify them to try to get your engine to work. But if you want to make your own engine control script, that would be advisable since you need to manage the liquid volume pump settings to get an optimal fuel mix, the engine's heat exchanger Setting to control temperature, a purge valve to manage overpressurization, and optionally a pressurant valve as a different option for engine pipe pressure. Remember that liquids have a molar density, and you can use this to calculate how to add exactly how much gas you need to correct or maintain a precise mix. Chapters 0:00 Intro 0:40 Engine overview 2:40 Fuel Option builds 3:50 Option 1: Heat exchange 4:02 Stable vs Unstable fuel mixes 8:02 Option 2: Pressurant Valve 9:49 Demonstration of each build 13:32 Data of different fuels 13:45 Complexity with engine fuel input 17:33 Fuel performances 23:20 Coding advice for mixing 27:10 Outtro