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ME 814.3 T2: Compressible Flow

ME 814.3 T2: Compressible Flow. Instructor: Maryam Einian Email: mae345@mail.usask.ca CFD lab: 1B85. Tests. Discharge of compressed air from a tank Flow through a converging-diverging nozzle. Discharge of compressed air from a tank. Fill the tank Discharge the tank

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ME 814.3 T2: Compressible Flow

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  1. ME 814.3 T2: Compressible Flow Instructor: Maryam Einian Email: mae345@mail.usask.ca CFD lab: 1B85

  2. Tests • Discharge of compressed air from a tank • Flow through a converging-diverging nozzle

  3. Discharge of compressed air from a tank • Fill the tank • Discharge the tank Observe the pressure and temperature variation in time

  4. Formulation • Quasi-steady process: • unsteady continuity • steady energy equation

  5. Converging-Diverging nozzle Application: Propulsion and the High speed flow of gases. Mass Flow Rate: Low Pressure at the back ? More mass flow rate

  6. Subsonic Flow (M<1) 1- Nozzle isn't choked 2- Accelerates through the converging section 3- Reaches its maximum speed at the throat. 4- Decelerates through the diverging section. 5- Lowering the back pressure increases the flow speed everywhere in the nozzle.

  7. Sonic Flow (M=1) 1- Nozzle is choked 2- Accelerates through the converging section 3- Reaches its maximum speed at the throat. (M=1) 4- Decelerates through the diverging section.

  8. Supersonic Flow (M>1) 1- Nozzle is choked 2- Accelerates through the converging section 3- Reaches its maximum speed at the throat. 4- Accelerates through the diverging section.

  9. Shock Wave 1- Nozzle is choked 2- Accelerates through the converging section 3- Reaches its maximum speed at the throat. 4- Accelerates through the diverging section. 5- Shock wave occurs. 6- Decelerates through the diverging section.

  10. Conservation Conservation of mass Conservation of momentum Conservation of energy

  11. Isentropic Flow A perfect gas

  12. Shock Wave Highly irreversible No isentropic process

  13. Mass Flow Rate

  14. Objectives • To obtain the pressure distribution along a converging-diverging nozzle. • To compare the experimental results with the theoretical calculations.

  15. Data Acquisition

  16. What Do We Require To Obtain From The Raw Data?

  17. Dimensions of Converging-Diverging Nozzle

  18. A Summary of Important Quantities

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