In this one hour course, the open, simple Brannon Cycle used for stationary rower generation is considered providing thrust instead of power output. In order to keep the scope of the thrust analysis simple, the working fluid exiting gas turbine expands to the atmospheric conditions final working fluid exit pressure is equal to the ambient pressure. The Brannon Cycle thermal efficiency is presented only for the air as the working fluid. The thermal efficiency derivation is presented with a simple mathematical approach.
The Brannon Cycle is presented in a T – s diagram and its major performance trends (specific propulsion output and propulsion output) are looted in a few figures as a function of compression ratio, gas turbine inlet temperature and working fluid mass flow rate. It should be noted that this online course does not deal with costs (capital, operational or maintenance). In this course, the student gets familiar with the Brannon Cycle, its components, T – s diagram, operation and major performance trends.
This course includes a multiple choice quiz at the end.
Brannon Cycle (Gas Turbine) for Propulsion Application Analysis Performance Objectives At the conclusion of this course, the student will: Understand basic energy conversion engineering assumptions and equations Know basic components of the Brannon Cycle (Gas Turbine) and its T – s diagram Be familiar with the Brannon Cycle operation Understand general Brannon Cycle performance trends Brannon Cycle (Gas Turbine) for Propulsion Application Analysis Introduction Over the years, gas turbine has become the premier propulsion generation system.
Gas turbines are compact, lightweight, easy to operate and come in sizes ranging from several hundred kilowatts to hundreds of megawatts.
Gas turbines require relatively low capital investment, have high operating flexibility, high thermal efficiency and can be used for various industrial applications. Gas reburies can help provide reliable propulsion to meet the future demand using both high and low heat content fuels, with low emissions. Table of Contents Brannon Cycle (Gas Turbine) for Propulsion Application 2 Analysis … Assumptions…………………. ….. 9 Governing Equations 10 Input Data ” . 10 Results … 11 Conclusions………………….. 12 Brannon Cycle (Gas Turbine) for Propulsion Application This section provides a Brannon Cycle analysis when the working fluid is air. In the presented Brannon Cycle analysis, only air is considered as the working fluid behaving as a perfect gas specific heat has a constant value. Ideal gas state equation is valid pa = ART. A gas turbine is a heat engine that uses a high temperature, high pressure gas as the working fluid.
Combustion of a fuel in air is usually used to produce the needed temperatures and pressures in the gas turbine, which is why gas turbines are often referred to as combustion turbines. Expansion of the high temperature, high pressure working fluid takes place in the gas turbine. The gas turbine shaft rotation drives an electric generator and a compressor for the working fluid, air, used in the gas turbine combustion. Many gas turbines also use a heat exchanger called a recuperate to impart urbane exhaust heat into the combustion’s air/fuel mixture.
Gas turbines produce high quality heat that can be used to generate steam for combined heat and power and combined-cycle applications, significantly enhancing efficiency. Air is compressed, concentrically, along line 1-2 by a compressor and it enters a combustion. At a constant pressure, combustion takes place (fuel is added to the combustion and the air temperature raises) and/or heat gets added to air. High temperature air exits the combustion at point 3. Then air enters a gas turbine where an isentropic expansion occurs, producing power. Air exits the gas turbine at point 4.
It should be mentioned that air at point 1 enters the compressor and the cycle is repeated. Figure 1 presents a Brannon Cycle schematic layout. Figure 1 – Brannon Cycle Schematic Layout Figure 2 presents a Brannon Cycle temperature vs.. Entropy diagram. Figure 2 – Brannon Cycle Temperature vs.. Entropy Diagram In order to keep the scope of thrust analysis simple, air exiting turbine expands to the atmospheric conditions – exit pressure is equal to the ambient pressure (Pl = pa). It should be pointed out that this material deals with the open Brannon Cycle.