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Because there is no heat flow, the entropy remains unchanged according to the second law of thermodynamics, so the adiabatic process is also isentropic .
Based on an assumption of one-dimensional isentropic flows, the shock pressure and the shack Mach number in the low-pressure chamber were Ps = 1.2 MPa and MS = 3.1 for PZ = 2.8 MPa.
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