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The accuracy of the result obtained in a fundamental paper by Kantrowitz (NACA TN 1225) that a small short-time lowering of the back pressure in steady, shock-free, transonic diffuser flow causes a stationary or trapped shock to form near the critical sonic channel throat is investigated by considering the contribution of a higher-order term in the short-time calculations which was neglected in Kantrowitz's paper. In this higher approximation to the short-time effects, the shock is no longer stationary or trapped unless it is supported by a negative steady-flow back pressure; the result thus is no long in disagreement with steady-flow solutions for stationary shocks.
An understanding of nonstationary gas flows (and liquids under high pressure) is of critical importance to engineers studying phenomena such as shock waves arising from an explosion of energy in a limited space, the behavior of media through which the shock propagate, and the nonstationary motion of a mixture of gases in energy-producing devices and engines. In this authoritative and well-written book, the reader will find comprehensive treatments of all important aspects of shock-tube and shock-wave research in pure and dusty gases, as well as of dissociated and ionized boundary layers, spherical and cylindrical explosion and implosion phenomena, hypervelocity launchers, and shock-wave reflections, diffractions, and refractions. Unique in its deft combination of analytical, numerical, and experimental work, the book expertly covers 40 years of continuous research in the area. It will be sought after by mechanical engineering students and researchers interested in explosion and blast wave phenomena.