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CHAPTER II1 UHEGT: CONCEPT AND BACKGROUND II.1. Sequential Combustion: Background and Evolution of Technology Conventional gas turbines have a multistage compressor followed by a combustion chamber and a multistage turbine. To substantially increase the thermal efficiency, in 1986, Schobeiri [6] introduced a multi-stage combustion process into gas turbines in a Brown Boveri2 report. In this process, the combustion takes place in sequential steps along the turbine stages, which leads to the elimination of the combustion chamber as a single separate unit. The idea behind the concept above is based on the well-known reheat process in steam turbines. In this process, after the steam exits from the high pressure stages, additional superheated steam is added to the main flow. The reheated steam flow then passes the intermediate and low pressure turbine stages. The addition of the hot steam improves the performance of the system and increases the average temperature of heat addition, making the cycle closer to the ideal Carnot cycle [11]. 1 Part of the materials are reprinted with permission from “The Ultrahigh Efficiency Gas Turbine Engine with Stator Internal Combustion,” by Meinhard T. Schobeiri and Seyed M. Ghoreyshi, 2016. ASME Journal of Engineering for Gas Turbines and Power Vol. 138, no. 2, Copyright © 2016 by ASME. 2 Former Brown Boveri (BBC), then Asea Brown Boveri (ABB), now GE-Alstom. 9PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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