You are not able to find the turbine and compressor blocks used in the example because they are Custom Components built by writing SimscapeTM Files. Refer the documentation for more information.
To access the block you can do the following,
1.Open the Example in Simulink using the following command in the MATLAB command-window
2.Right-click on the Turbine block / Compressor Block
3.Library Link -> Go To Library Block