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In-Text Concept Questions a-g Concept problems Brayton cycles, gas turbines Regenerators, Intercoolers, nonideal cycles Ericsson cycle Jet engine cycles Air standard refrigeration cycles Otto cycles Diesel cycles Stirling and Carnot cycles Atkinson and Miller cycles Combined cycles Availability or Exergy Concepts Review Problems re-solved with the Pr, vr functions from A. Any other reproduction or translation of this work beyond that permitted by Sections or of the United States Copyright Act without the permission of the copyright owner is unlawful.
Borgnakke and Sonntag In-Text Concept Questions Excerpts from this work may be reproduced by instructors for distribution on a not-for-profit basis for testing or instructional purposes only to students enrolled in courses for which this textbook has been adopted. Borgnakke and Sonntag The Brayton cycle have all processes in the superheated vapor close to ideal gas region.
The Rankine cycle crosses in over the two-phase region. What happens when the pressure ratio is increased? When the pressure ratio is high, the temperature after compression is higher than the temperature after expansion. The exhaust flow can then not heat the flow into the combustor.
The cooler provides two effects. It reduces the specific volume and thus reduces the work in the following compressor stage. It also reduces the temperature into the combustor and thus lowers the peak temperature. This makes the control of the combustion process easier no autoignition or uncontrollable flame spread , it reduces the formation of NOx that takes place at high temperatures and lowers the cooling requirements for the chamber walls.
Excerpts from this work may be reproduced by instructors for distribution on a not-for-profit basis for testing or instructional purposes only to students enrolled in courses for which this textbook has been adopted. The turbine produces just enough shaft work to drive the compressor and it makes a little electric power for the aircraft. The power is produced as thrust of the engine. In order to exhaust the gases at high speed they must be accelerated so the high pressure in the turbine exit provides that force high P relative to ambient.
The high P into the turbine is made by the compressor, which pushes the flow backwards, and thus has a net resulting force forwards on the blades transmitted to the shaft and the aircraft. The outer housing also has a higher pressure inside that gives a net component in the forward direction.
The compression in an Otto cycle is a volume reduction dictated by the piston motion. The physical handles are the volumes V1 and V2. The compression in a Brayton cycle is the compressor pushing on the flow so it determines the pressure. The physical control is the pressure P2 determined by how much torque you drive the shaft with. How about the Diesel cycle? Otto cycle. State 1 2 parameters and the compression ratio CR and the energy release per unit mass in the combustion, a total of 4 parameters.
With that information you can draw the diagrams in Figure Diesel cycle. Same as for the Otto cycle namely 4 parameters. The only difference is that one constant v process is changed to a constant P process.
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