Study of initial shock wave in exhausted flow field by use of a Laser Moire Deflectometry instrument

摘要

The initial show wave is a non-stationary phenomenon in the initial stage of an exhausted flow field. Its movement characteristic and development process cannot be mastered accurately with the use of contact-type measurement methods, such as pressure and velocity measurements. An experimental study of the shock wave field by use of a Laser Moire Deflectometry instrument is introduced in this paper. The instrument has a large caliber, high sensitivity and high precision. A serial photograph of shock wave field is also presented. The formation mechanism and development trend of the initial shock wave can be drawn from analysis of flow field display photographs. (C) 2000 Elsevier Science Ltd. All rights reserved. [References: 3]