Investigation of an electrogasdynamic energy conversion process in a gas expanding nozzle with heat addition

摘要

An electrogasdynamic (EGO) generator produces electricity by using a moving gas stream to transport charged particles from a low electric potential region to a high electric potential region. EGD electric conversion combined with the acceleration of gas expansion in a de laval nozzle is one of the methods of converting heat directly into electricity. A two-dimensional axis-symmetric model was developed to explore the effect of heat addition to the two phase flow acceleration process of air and charged solid particle inside the EGD gas expander nozzle. The results indicate that heat addition can effectively change the characteristics of the two phase flow. The added heat energy can be considerably converted into the kinetic energy of the air and the charged particles. Consequently, the heat to electricity efficiency of the energy conversion process in EGO gas expanding nozzle with heat addition can be further improved by the increasing of particle flow rate. (C) 2015 Elsevier Ltd. All rights reserved.