In aircraft design and the analysis of turbofan engines, the ideal pressure ratio represents the pressure increase that would be achieved by the compressor under ideal, isentropic (reversible and adiabatic) conditions. It’s a theoretical value used for comparison with the actual pressure ratio to assess the compressor’s performance. Here’s the formula, definition, and SI unit for ideal pressure ratio:Formula:
The formula for the ideal pressure ratio (PR_ideal) is calculated based on the isentropic compression process as follows:
- PR_ideal is the ideal pressure ratio, a dimensionless value.
- (P2 / P1)_isentropic is the pressure ratio that would be achieved if the compression process were isentropic (reversible and adiabatic), based on the initial and final pressures.