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TsAGI Science Journal

ISSN Print: 1948-2590
ISSN Online: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2014010958
pages 639-664

QUASI-ONE-DIMENSIONAL SEPARATION TYPE MODEL OF PSEUDO-SHOCK IN A DUCT

Evgeniy Aleksandrovich Meshcheryakov
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky 140180, Russia
Violetta Vasilievna Yashina
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky 140180, Russia

ABSTRACT

A quasi-one-dimensional separation model of pseudo-shock in constant-area ducts is developed as applies to inlet isolators (diffusers) of scramjet engines. Based on this model, closed analytical dependences for the distance of the upstream pressure propagation on the backpressure, inlet Mach number, and duct shape are obtained. Using the single empirical constant, which has a simple physical meaning, the solution satisfactory describes a wide range of test data on pseudo-shock lengths in the ducts of various shapes. The model generalization is proposed for deceleration flows in divergent diffusers, which are found in wide applications in aerodynamic research. Some principal features of such flows are analyzed.