Abstract
The Janzen (1)-Rayleigh(2) process for finding the first-order effect of compressibility on the potential flow past a solid body consists in expanding the velocity potential, stream function or velocity components in powers of M2, and determining the terms in M2, where M is the Mach number. The problem is solved explicitly in this report for two-dimensional flow past a symmetrical body at zero incidence, either in unlimited fluid or symmetrically placed in a channel, when the irrotational incompressible flow is known. The asymmetric case is also briefly considered.

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