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clc
// Example 5.7.py
// Consider the wind tunnel described in example 5.2. Estimate the ratio of diffuser
// throat area to nozzle throat area required to allow the tunnel to start. Also,
// assuming that the diffuser efficiency is 1.2 after the tunnel has started, calculate
// the pressure ratio across the tunnel necessary for running i.e. calculate the ratio
// of total pressure at the diffuser exit to the reservoir pressure.
// Variable declaration
M = 2.5 // mach number before the shock
eta_d = 1.2 // diffuser efficiency
// Calculations
// from table for M = 2.5
po2_by_po1 = 0.499 // po2/po1
At2_by_At1 = 1 / po2_by_po1 // At2/At1 = po1/po2
Pdo_by_po = eta_d * po2_by_po1 // pdo/po
// Results
printf("\n Ratio of diffuser throat area to nozzle throat area %.2f", At2_by_At1)
printf("\n Ratio of total pressure at the diffuser exit to the reservoir pressure, %.3f",(Pdo_by_po))
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