Unformatted text preview: result. Compute the stagnation pressures at points 1 and 2 . Can you explain how it can be that the velocity increases for this frictional flow? Should this process be isentropic or not? Justify your answer by computing the change in entropy between points 1 and 2 . Plot static and stagnation state points on a Ts diagram. 4. Consider steady, adiabatic flow of air through a long straight pipe with A = 0.05 m 2 . At the inlet (section 1 ) the air is at 200 kPa (abs), 60 o C, and 136 m/s. Downstream at section 2, the air is at 95.6 kPa (abs) and 280 m/s. Determine p o1 , p o2 , To1, T o2 and the entropy change for the flow. Show static and stagnation state points on a Ts diagram. 5. A CO 2 cartridge is used to propel a toy rocket. Gas in the cartridge is pressurized to 6 MPa (gage) and is at 25 o C. Calculate the critical conditions (temperature, pressure, and flow speed) that correspond to these stagnation conditions....
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- Fall '08
- Thermodynamics, TS diagram, stagnation state points