Device and method used for observing air flow field structure in environment of different degrees of vacuum

Abstract

The invention discloses a device and a method used for observing an air flow field structure in environment of different degrees of vacuum. The device is composed of a light source, a collimating lens, a pressure transmitter, a gas nozzle, a vacuum chamber, a focusing lens, a cut, a camera, a high reflectivity and high transmittance lens, a first CCD camera, a second CCD camera, a totally reflecting mirror, a focusing convex cylindrical lens, a collimating convex cylindrical lens, a plano-concave lens, a laser, a vacuum pump, a gas nozzle and a vacuum pump. According to the invention, a schlieren method and acetone PLIF are used to simultaneously observe the air flow field structure in environment of different degrees of vacuum; through the contrast correction of information acquired in two observing manners at the same time, a real air flow field structure is acquired; the success probability and the reliability of high altitude and space laser ignition are improved; the device and the method focus on observing the air flow field structure under different degrees of vacuum; and the air flow field structure information acquired through the device and the method can effectively help to choose the best ignition location for the laser ignition scheme of an engine in different environments.

Description

technical field [0001] The invention belongs to the field of aerodynamics, and relates to a device and a method for observing the structure of the air flow field under different vacuum degree environments. Background technique [0002] Today, with the deepening research on the ignition technology of aircraft turbine engines, military aircraft scramjet engines, rocket engines and aviation rocket attitude control and orbit control engines, in the face of many disadvantages of traditional ignition technology, laser plasma ignition technology and laser ignition Technology has become a very popular research topic, and this technology has great potential to replace the traditional spark ignition method. [0003] Although laser-induced plasma ignition technology has many advantages over traditional ignition methods, such as no electromagnetic interference, non-invasive ignition, precise and controllable ignition position and time, multiple ignitions and multi-point simultaneous ign...

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Problems solved by technology

[0003] Although laser-induced plasma ignition technology has many advantages over traditional ignition methods, such as no electromagnetic interference, non-invasive ignition, precise and controllable ignition position and time, multiple ignitions and multi-point simultaneous ignition, etc. The traditional ignition technology has a small action area and a short action time, so it is particularly important to choose a suitable ignition position to improve ignition reliability

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