Understanding Converging Diverging Nozzle — Lesson 4

This lesson covers the detailed analysis of a converging diverging nozzle with an exit to throat area ratio of 3.5. It explains the process of determining the exit conditions when the back pressure is 20 kilo pascal and 500 kilo pascal. The lesson also discusses the concept of isentropic solutions and how to retrieve values from the isentropic table. It further elaborates on the calculation of exit mach number and exit pressure. The lesson concludes with an alternative method of solution, explaining the concept of the sonic state as a reference state.

Video Highlights

03:12 - Plotting the supersonic solution
06:32 - Analysis of the first case with a back pressure of 20 kilo pascal
08:06 - Detailed explanation of the alternative method of solution

Key Takeaways

- The analysis of a converging diverging nozzle involves determining the exit conditions based on the back pressure and assuming a working fluid.
- Isentropic solutions play a crucial role in this analysis, and values can be retrieved from the isentropic table.
- The exit mach number and exit pressure can be calculated using the values retrieved from the table.
- The concept of normal shock at the exit is important in understanding the flow situation.
- An alternative method of solution involves assuming the location of the shock wave and following a sequence of steps to calculate the exit static pressure.