seemingly wrong power given by Simscape block Compressor(G) and Turbine(G)

Hello. I am recently playing with the Brayton Cycle Gas Turbine example. After I entered the component maps and other inputs, the calculated dynamics seemed much off. In specific, I entered steady-state data with the fluid power of both the compressor and the turbine of about 300kW, but the gas generator speed dropped continuously. I then looked at the logged data and found that the power was much different: the fluid power of the turbine was lower than expected and even lower than that of the compressor. I checked other variables like pressures, temperatures, and isentropic efficiencies, but they all seemed correct, which should give correct powers in theory. I then calculated the fluid power using the mass flow rate times the specific enthalpy change across the component and found them correct and congruent with the temperature and specific heat capacity data, with the turbine fluid power higher than that of the compressor. However, the energy inflow and outflow (Phi_A and Phi_B in the block) were inconsistent with the enthalpy data, which are shown below. The above analysis led me to suspect that the problem is from the Simscape block itself. I performed the same procedure to the original example and observed that the fluid power was still lower than that calculated from enthalpy change, shown below. Could anybody provide some hints on this issue?

[Yifeng Tang]

There is a "scale factor" in the example. Have you tried playing with that value first to get the system to work roughly at the power you want?

It's usually tricky to set one component at a time in a large model. One often need to set up test harness models to make sure the parameters of a certain component are set properly before integrating into the bigger model.