Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Development of ionization sensors for shockwave speed measurements
Submission Author:
Rafael Augusto Cintra , SP
Co-Authors:
Tiago Rolim, Lucas Alexandre Gonçalves Ribeiro, Rafael Augusto Cintra
Presenter: Rafael Augusto Cintra
doi://10.26678/ABCM.COBEM2017.COB17-0453
Abstract
Recently, there is a growing interest in studies concerning ionization sensors for aerospace applications, power generation and fundamental research. In aerospace research, they have been used for studies on shock and detonation waves. Two key features of these sensors are their short response time, in order of microseconds, and the fact that they are activated when exposed to high temperature air. This work describes the development of ionization sensor to be used in shock tube facilities. The sensor consists of two thorium-tungsten electrodes insulated by a ceramic, with aluminum adapter for proper mounting, and two copper seal rings. An electrical circuit was also built with two main purposes: to provide the electrodes a sufficient large voltage difference in order to ease ionization of the gas and to assure a short time response of the sensor. The tests were done in a shock tube, with the objective of determine the shockwave speed in air and in argon. The results proved the functionality of the ionization sensors to acquire the instant of the shockwave passage. Also, the sensors proved to be useful to measure the shockwave speed with a low difference in comparison to the PCB sensors, in which the greatest difference in the tests was 3.06%.
Keywords
Ionization sensors, Shock tubes, Shockwaves
