Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
EXPERIMENTAL INVESTIGATION OF IONIZATION SENSORS UNDER SHOCK TUBE STAGNATION CONDITIONS
Submission Author:
Rafael Augusto Cintra , SP
Co-Authors:
Tiago Rolim, Bruno Coelho Lima
Presenter: Rafael Augusto Cintra
doi://10.26678/ABCM.ENCIT2016.CIT2016-0278
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 time response, of the order of microseconds, and the fact that they are activated when exposed to high temperature air. In this sense, this paper describes the development of an ionization sensor to be used in shock tube facilities. The sensor consists of two thorium-tungsten electrodes insulated by a ceramic, with a stainless steel adapter for proper mounting, and two copper seal rings. An electrical circuit was also built with two main purposes: to provide the electrodes with a sufficient large voltage difference in order to ease ionization of the air and to assure a short time response of the sensor. The tests were done in a shock tube with the objective to observe the response of the sensor under stagnation conditions. For that, we chose initial driven pressures of 1.0, 1.2 and 1.5 kgf/cm², with a constant driver pressure equal to 70 kgf/cm². We analyzed the response of the sensor as a function of the initial driven pressure, stagnation temperature and density. For the studied conditions, the results showed that the mean amplitude of the ionization sensor signal varied from 8.29 to 19.70 mV.
Keywords
Ionization sensors, Shock tubes, Shockwaves, Ionization sensors, Shock tubes, Shockwaves
