I'm a controls guy and I would like to "emulate" a given rocket engine's response behavior to different thrust signals inside a computer simulation. Thus I'm looking for a book that explains well the different equations that govern a rocket engine's response as a function of propellant, nozzle shape, configuration, etc. You can see that this does not concern the deep fluid dynamics and thermodynamics of it all... I'm just looking for the "high level dynamics" if you see what I mean. Does such a book or resource exist? Thanks a lot for your help!
Rocket Propulsion Elements by Sutton is a good general reference. Chapter 7, Liquid Propellant Rocket Fundamentals, contains the basic equations that should get you started. Figure 7-7 is particularly good, showing a schematic gas generator engine with the equations that govern the performance of each component. You could probably gen up a decent simulation just starting from this diagram and learning about the equations it contains.
(All my references are to my nearly worn out 1976 printing of the 4th edition)
I also have the 1984 Oates "Aerothermodynamics of Gas Turbine and Rocket Propulsion" and it's quite good but more difficult. Oates had useful information about computing gas temps in the combustion chamber (it is an iterative relationship).