
Here I introduce the concept of the heat engine. I define the source and the sink. I then use the first and second laws of thermodynamics to derive the Carnot efficiency. I then point out that the…
Optional Metadata  Department
Faculty of Engineering


Here I introduce two ineffinciencies into the ideal Brayton cycle I described in the previous lecture. Firstly, the effect of friction on the turbine and compressore. Then, I look at the effect of…
Optional Metadata  Department
Aerospace Engineering


Here I go through an example of a Brayton cycle. I show that, using previous knowledge of devices, we can calculte the heat and work terms for the three devices and therefore work out the efficiency…
Optional Metadata  Department
Aerospace Engineering


Here I work through two examples of the effect of isentropic efficiency on devices. I use the nozzle and the compressor as examples. I show that you need to produce a system and a TS diagram. THen…
Optional Metadata  Department
Aerospace Engineering


Here I introduce an example of a power cycle. The open cycle Air, Brayton cycle. I look at the three elements and describe what happens in each one. THe I go throught a description of a rea jet…
Optional Metadata  Department
Aerospace Engineering


Here I introduce an example of the Carnot cycle (open using air). I show that it forms a rectangle on the TS diagram. I then show that this is the maximum efficiency of a heat engine cycle as: 1)…
Optional Metadata  Department
Aerospace Engineering


Here I show that the area under the PV and TS diagrams are the work produced in a cycle. I show (again that the efficiency is the ratio between work out and heat in, but here I do it graphcally.
Optional Metadata  Department
Aerospace Engineering


Here I introduce the concept of efficiency. I show how these can be shown on a Ts diagram. THis gives the isentropic efficiency.
Optional Metadata  Department
Aerospace Engineering


Here I introduce the Ts diagram for ideal gasses. I show that an isentropic expansion is a vertical upward line on this and an isentropic compression is a vertical downward line. I then show that in…
Optional Metadata  Department
Aerospace Engineering


We look at the throttle valve,, which is a constant enthalpy device. We see that it reduces pressure and increases the entropy of the flow. THen we compare the throttle to a turbine to get a better…
