This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: 2.5. BRAYTON 45 x 3: combustion chamber, 3 4: expansion in turbine, and 4 y : turbine exit gas goes through regenerator (heat exchanger). A schematic for the Brayton cycle is shown in Figure 2.11. Turbine Compressor 1 4 w Regenerator Combustion chamber 2 3 x y Figure 2.11: Schematic for Brayton cycle with regeneration. For this to work, the gas at the turbine exit must have a higher temperature than the gas at the compressor exit. If the compression ratio is high, the compressor exit temperature is high, and there is little benefit to regeneration. Now consider the regenerator, which is really a heat exchanger. The first law holds that dE cv dt bracehtipupleft bracehtipdownrightbracehtipdownleft bracehtipupright =0 = Q cv bracehtipupleftbracehtipdownrightbracehtipdownleftbracehtipupright =0 W cv bracehtipupleftbracehtipdownrightbracehtipdownleftbracehtipupright =0 + mh 2 mh x + mh 4 mh y , (2.259) 0 = h 2 h x + h 4 h y , (2.260)(2....
View Full Document