How do we maintain the RPM of turbo pumps in liquid rocket engines?

In summary, maintaining the RPM of turbo pumps in liquid rocket engines involves controlling the flow of exhaust gas with a valve. For electric pump fed engines like Rocket Lab's Rutherford engine, controlling the amount of fuel or oxidizer is the method used. However, this can be challenging due to the potential for bad positive feedback in the dynamic.
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RocketAstro
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How do we maintain the RPM of turbo pumps in liquid rocket engine ? and how do we control it ? and in the case of electric pump fed engine (like rocket labs's rutherford engine) is easy but how we do it for other liquid propellant engines ?
 
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I'm not sure if there is a 'global' answer to your question. For the RS-25 (Space Shuttle Main Engine), exhaust gas drives the pumps. The flow of exhaust gas is throttled with a valve.
 
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I think the closest to a global answer is that one controls the amount of fuel (in an oxygen-rich system) or oxidizer (in a fuel-rich system) or both (in an open system) . The possibility of bad positive feedback in this dynamic makes the production of throttleable turbine fed systems nontrivial, particularly for the staged combustion motors.
 
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FAQ: How do we maintain the RPM of turbo pumps in liquid rocket engines?

How does the RPM of turbo pumps affect the performance of a liquid rocket engine?

The RPM (revolutions per minute) of turbo pumps is crucial to the performance of a liquid rocket engine. It determines the flow rate and pressure of the propellant being pumped into the combustion chamber, which ultimately affects the thrust and efficiency of the engine.

What factors affect the RPM of turbo pumps in liquid rocket engines?

The RPM of turbo pumps can be affected by a variety of factors, including the design and size of the pump, the type of propellant being used, and the temperature and pressure conditions in the engine.

How is the RPM of turbo pumps controlled in liquid rocket engines?

The RPM of turbo pumps is typically controlled by a computerized system that monitors and adjusts the speed of the pumps based on various inputs, such as engine performance data, sensor readings, and user commands.

What happens if the RPM of turbo pumps is too low or too high?

If the RPM of turbo pumps is too low, it can result in insufficient propellant flow and reduced engine performance. On the other hand, if the RPM is too high, it can cause excessive strain on the pumps, leading to potential malfunctions or failures.

How do scientists and engineers optimize the RPM of turbo pumps in liquid rocket engines?

To optimize the RPM of turbo pumps, scientists and engineers use computer simulations and experimental testing to determine the most efficient and reliable speed for a specific engine design and operating conditions. They also continuously monitor and adjust the RPM during engine operation to ensure optimal performance.

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